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caching.html

caching.html 61 KB
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  3. <!DOCTYPE html>
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  4. <!--[if IE 8]><html class="no-js lt-ie9" lang="en" > <![endif]-->
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  8.   <meta name="viewport" content="width=device-width, initial-scale=1.0">
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  9.   
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  10.   <title>Caching Driver &mdash; CodeIgniter 3.1.11 documentation</title>
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  99. <li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
    100. 

  100. <li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
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  105. <li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
    106. 

  106. <li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
    107. 

  107. <li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
    108. 

  108. <li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
    109. 

  109. <li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
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  110. <li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
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    112. 

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    113. 

  113. <li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
    114. 

  114. <li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
    115. 

  115. <li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
    116. 

  116. <li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
    117. 

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    118. 

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    119. 

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    127. 

  127. <li class="toctree-l2 current"><a class="current reference internal" href="#">Caching Driver</a></li>
    128. 

  128. <li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li>
    129. 

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    135. 

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    137. 

  137. <li class="toctree-l2"><a class="reference internal" href="image_lib.html">Image Manipulation Class</a></li>
    138. 

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    141. 

  141. <li class="toctree-l2"><a class="reference internal" href="loader.html">Loader Class</a></li>
    142. 

  142. <li class="toctree-l2"><a class="reference internal" href="migration.html">Migrations Class</a></li>
    143. 

  143. <li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li>
    144. 

  144. <li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li>
    145. 

  145. <li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li>
    146. 

  146. <li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li>
    147. 

  147. <li class="toctree-l2"><a class="reference internal" href="sessions.html">Session Library</a></li>
    148. 

  148. <li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li>
    149. 

  149. <li class="toctree-l2"><a class="reference internal" href="trackback.html">Trackback Class</a></li>
    150. 

  150. <li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li>
    151. 

  151. <li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li>
    152. 

  152. <li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li>
    153. 

  153. <li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li>
    154. 

  154. <li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
    155. 

  155. <li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li>
    156. 

  156. </ul>
    157. 

  157. </li>
    158. 

  158. </ul>
    159. 

  159. <ul>
    160. 

  160. <li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
    161. 

  161. <li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
    162. 

  162. <li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
    163. 

  163. <li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
    164. 

  164. <li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
    165. 

  165. <li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
    166. 

  166. <li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
    167. 

  167. <li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
    168. 

  168. <li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
    169. 

  169. <li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
    170. 

  170. <li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
    171. 

  171. <li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
    172. 

  172. <li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
    173. 

  173. <li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
    174. 

  174. <li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
    175. 

  175. </ul>
    176. 

  176. </li>
    177. 

  177. </ul>
    178. 

  178. <ul>
    179. 

  179. <li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
    180. 

  180. <li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
    181. 

  181. <li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
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  182. <li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
    183. 

  183. <li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
    184. 

  184. <li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
    185. 

  185. <li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
    186. 

  186. <li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
    187. 

  187. <li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
    188. 

  188. <li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
    189. 

  189. <li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
    190. 

  190. <li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
    191. 

  191. <li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
    192. 

  192. <li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
    193. 

  193. <li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
    194. 

  194. <li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
    195. 

  195. <li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
    196. 

  196. <li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
    197. 

  197. <li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
    198. 

  198. <li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
    199. 

  199. <li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
    200. 

  200. <li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
    201. 

  201. </ul>
    202. 

  202. </li>
    203. 

  203. </ul>
    204. 

  204. 

  205.       </div>
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  206.     
    207. 

  207.       
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  208.   </div>
    209. 

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    210. 

  210. <div id="nav2">
    211. 

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  212.     <img src="data:image/jpeg;base64,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" title="Toggle Table of Contents" alt="Toggle Table of Contents" />
    213. 

  213.   </a>
    214. 

  214. </div>
    215. 

  215. 

  216.   <div class="wy-grid-for-nav">
    217. 

  217. 

  218.     
    219. 

  219.     <nav data-toggle="wy-nav-shift" class="wy-nav-side">
    220. 

  220.       <div class="wy-side-nav-search">
    221. 

  221.         
    222. 

  222.           <a href="../index.html" class="fa fa-home"> CodeIgniter</a>
    223. 

  223.         
    224. 

  224.         
    225. 

  225. <div role="search">
    226. 

  226.   <form id="rtd-search-form" class="wy-form" action="../search.html" method="get">
    227. 

  227.     <input type="text" name="q" placeholder="Search docs" />
    228. 

  228.     <input type="hidden" name="check_keywords" value="yes" />
    229. 

  229.     <input type="hidden" name="area" value="default" />
    230. 

  230.   </form>
    231. 

  231. </div>
    232. 

  232.       </div>
    233. 

  233. 

  234.       <div class="wy-menu wy-menu-vertical" data-spy="affix" role="navigation" aria-label="main navigation">
    235. 

  235.         
    236. 

  236.           
    237. 

  237.           
    238. 

  238.               <ul>
    239. 

  239. <li class="toctree-l1"><a class="reference internal" href="../general/welcome.html">Welcome to CodeIgniter</a></li>
    240. 

  240. </ul>
    241. 

  241. <ul>
    242. 

  242. <li class="toctree-l1"><a class="reference internal" href="../installation/index.html">Installation Instructions</a><ul>
    243. 

  243. <li class="toctree-l2"><a class="reference internal" href="../installation/downloads.html">Downloading CodeIgniter</a></li>
    244. 

  244. <li class="toctree-l2"><a class="reference internal" href="../installation/index.html">Installation Instructions</a></li>
    245. 

  245. <li class="toctree-l2"><a class="reference internal" href="../installation/upgrading.html">Upgrading From a Previous Version</a></li>
    246. 

  246. <li class="toctree-l2"><a class="reference internal" href="../installation/troubleshooting.html">Troubleshooting</a></li>
    247. 

  247. </ul>
    248. 

  248. </li>
    249. 

  249. </ul>
    250. 

  250. <ul>
    251. 

  251. <li class="toctree-l1"><a class="reference internal" href="../overview/index.html">CodeIgniter Overview</a><ul>
    252. 

  252. <li class="toctree-l2"><a class="reference internal" href="../overview/getting_started.html">Getting Started</a></li>
    253. 

  253. <li class="toctree-l2"><a class="reference internal" href="../overview/at_a_glance.html">CodeIgniter at a Glance</a></li>
    254. 

  254. <li class="toctree-l2"><a class="reference internal" href="../overview/features.html">Supported Features</a></li>
    255. 

  255. <li class="toctree-l2"><a class="reference internal" href="../overview/appflow.html">Application Flow Chart</a></li>
    256. 

  256. <li class="toctree-l2"><a class="reference internal" href="../overview/mvc.html">Model-View-Controller</a></li>
    257. 

  257. <li class="toctree-l2"><a class="reference internal" href="../overview/goals.html">Architectural Goals</a></li>
    258. 

  258. </ul>
    259. 

  259. </li>
    260. 

  260. </ul>
    261. 

  261. <ul>
    262. 

  262. <li class="toctree-l1"><a class="reference internal" href="../tutorial/index.html">Tutorial</a><ul>
    263. 

  263. <li class="toctree-l2"><a class="reference internal" href="../tutorial/static_pages.html">Static pages</a></li>
    264. 

  264. <li class="toctree-l2"><a class="reference internal" href="../tutorial/news_section.html">News section</a></li>
    265. 

  265. <li class="toctree-l2"><a class="reference internal" href="../tutorial/create_news_items.html">Create news items</a></li>
    266. 

  266. <li class="toctree-l2"><a class="reference internal" href="../tutorial/conclusion.html">Conclusion</a></li>
    267. 

  267. </ul>
    268. 

  268. </li>
    269. 

  269. </ul>
    270. 

  270. <ul>
    271. 

  271. <li class="toctree-l1"><a class="reference internal" href="../contributing/index.html">Contributing to CodeIgniter</a><ul>
    272. 

  272. <li class="toctree-l2"><a class="reference internal" href="../documentation/index.html">Writing CodeIgniter Documentation</a></li>
    273. 

  273. <li class="toctree-l2"><a class="reference internal" href="../DCO.html">Developer’s Certificate of Origin 1.1</a></li>
    274. 

  274. </ul>
    275. 

  275. </li>
    276. 

  276. </ul>
    277. 

  277. <ul>
    278. 

  278. <li class="toctree-l1"><a class="reference internal" href="../general/index.html">General Topics</a><ul>
    279. 

  279. <li class="toctree-l2"><a class="reference internal" href="../general/urls.html">CodeIgniter URLs</a></li>
    280. 

  280. <li class="toctree-l2"><a class="reference internal" href="../general/controllers.html">Controllers</a></li>
    281. 

  281. <li class="toctree-l2"><a class="reference internal" href="../general/reserved_names.html">Reserved Names</a></li>
    282. 

  282. <li class="toctree-l2"><a class="reference internal" href="../general/views.html">Views</a></li>
    283. 

  283. <li class="toctree-l2"><a class="reference internal" href="../general/models.html">Models</a></li>
    284. 

  284. <li class="toctree-l2"><a class="reference internal" href="../general/helpers.html">Helpers</a></li>
    285. 

  285. <li class="toctree-l2"><a class="reference internal" href="../general/libraries.html">Using CodeIgniter Libraries</a></li>
    286. 

  286. <li class="toctree-l2"><a class="reference internal" href="../general/creating_libraries.html">Creating Libraries</a></li>
    287. 

  287. <li class="toctree-l2"><a class="reference internal" href="../general/drivers.html">Using CodeIgniter Drivers</a></li>
    288. 

  288. <li class="toctree-l2"><a class="reference internal" href="../general/creating_drivers.html">Creating Drivers</a></li>
    289. 

  289. <li class="toctree-l2"><a class="reference internal" href="../general/core_classes.html">Creating Core System Classes</a></li>
    290. 

  290. <li class="toctree-l2"><a class="reference internal" href="../general/ancillary_classes.html">Creating Ancillary Classes</a></li>
    291. 

  291. <li class="toctree-l2"><a class="reference internal" href="../general/hooks.html">Hooks - Extending the Framework Core</a></li>
    292. 

  292. <li class="toctree-l2"><a class="reference internal" href="../general/autoloader.html">Auto-loading Resources</a></li>
    293. 

  293. <li class="toctree-l2"><a class="reference internal" href="../general/common_functions.html">Common Functions</a></li>
    294. 

  294. <li class="toctree-l2"><a class="reference internal" href="../general/compatibility_functions.html">Compatibility Functions</a></li>
    295. 

  295. <li class="toctree-l2"><a class="reference internal" href="../general/routing.html">URI Routing</a></li>
    296. 

  296. <li class="toctree-l2"><a class="reference internal" href="../general/errors.html">Error Handling</a></li>
    297. 

  297. <li class="toctree-l2"><a class="reference internal" href="../general/caching.html">Caching</a></li>
    298. 

  298. <li class="toctree-l2"><a class="reference internal" href="../general/profiling.html">Profiling Your Application</a></li>
    299. 

  299. <li class="toctree-l2"><a class="reference internal" href="../general/cli.html">Running via the CLI</a></li>
    300. 

  300. <li class="toctree-l2"><a class="reference internal" href="../general/managing_apps.html">Managing your Applications</a></li>
    301. 

  301. <li class="toctree-l2"><a class="reference internal" href="../general/environments.html">Handling Multiple Environments</a></li>
    302. 

  302. <li class="toctree-l2"><a class="reference internal" href="../general/alternative_php.html">Alternate PHP Syntax for View Files</a></li>
    303. 

  303. <li class="toctree-l2"><a class="reference internal" href="../general/security.html">Security</a></li>
    304. 

  304. <li class="toctree-l2"><a class="reference internal" href="../general/styleguide.html">PHP Style Guide</a></li>
    305. 

  305. </ul>
    306. 

  306. </li>
    307. 

  307. </ul>
    308. 

  308. <ul class="current">
    309. 

  309. <li class="toctree-l1 current"><a class="reference internal" href="index.html">Libraries</a><ul class="current">
    310. 

  310. <li class="toctree-l2"><a class="reference internal" href="benchmark.html">Benchmarking Class</a></li>
    311. 

  311. <li class="toctree-l2 current"><a class="current reference internal" href="#">Caching Driver</a></li>
    312. 

  312. <li class="toctree-l2"><a class="reference internal" href="calendar.html">Calendaring Class</a></li>
    313. 

  313. <li class="toctree-l2"><a class="reference internal" href="cart.html">Shopping Cart Class</a></li>
    314. 

  314. <li class="toctree-l2"><a class="reference internal" href="config.html">Config Class</a></li>
    315. 

  315. <li class="toctree-l2"><a class="reference internal" href="email.html">Email Class</a></li>
    316. 

  316. <li class="toctree-l2"><a class="reference internal" href="encrypt.html">Encrypt Class</a></li>
    317. 

  317. <li class="toctree-l2"><a class="reference internal" href="encryption.html">Encryption Library</a></li>
    318. 

  318. <li class="toctree-l2"><a class="reference internal" href="file_uploading.html">File Uploading Class</a></li>
    319. 

  319. <li class="toctree-l2"><a class="reference internal" href="form_validation.html">Form Validation</a></li>
    320. 

  320. <li class="toctree-l2"><a class="reference internal" href="ftp.html">FTP Class</a></li>
    321. 

  321. <li class="toctree-l2"><a class="reference internal" href="image_lib.html">Image Manipulation Class</a></li>
    322. 

  322. <li class="toctree-l2"><a class="reference internal" href="input.html">Input Class</a></li>
    323. 

  323. <li class="toctree-l2"><a class="reference internal" href="javascript.html">Javascript Class</a></li>
    324. 

  324. <li class="toctree-l2"><a class="reference internal" href="language.html">Language Class</a></li>
    325. 

  325. <li class="toctree-l2"><a class="reference internal" href="loader.html">Loader Class</a></li>
    326. 

  326. <li class="toctree-l2"><a class="reference internal" href="migration.html">Migrations Class</a></li>
    327. 

  327. <li class="toctree-l2"><a class="reference internal" href="output.html">Output Class</a></li>
    328. 

  328. <li class="toctree-l2"><a class="reference internal" href="pagination.html">Pagination Class</a></li>
    329. 

  329. <li class="toctree-l2"><a class="reference internal" href="parser.html">Template Parser Class</a></li>
    330. 

  330. <li class="toctree-l2"><a class="reference internal" href="security.html">Security Class</a></li>
    331. 

  331. <li class="toctree-l2"><a class="reference internal" href="sessions.html">Session Library</a></li>
    332. 

  332. <li class="toctree-l2"><a class="reference internal" href="table.html">HTML Table Class</a></li>
    333. 

  333. <li class="toctree-l2"><a class="reference internal" href="trackback.html">Trackback Class</a></li>
    334. 

  334. <li class="toctree-l2"><a class="reference internal" href="typography.html">Typography Class</a></li>
    335. 

  335. <li class="toctree-l2"><a class="reference internal" href="unit_testing.html">Unit Testing Class</a></li>
    336. 

  336. <li class="toctree-l2"><a class="reference internal" href="uri.html">URI Class</a></li>
    337. 

  337. <li class="toctree-l2"><a class="reference internal" href="user_agent.html">User Agent Class</a></li>
    338. 

  338. <li class="toctree-l2"><a class="reference internal" href="xmlrpc.html">XML-RPC and XML-RPC Server Classes</a></li>
    339. 

  339. <li class="toctree-l2"><a class="reference internal" href="zip.html">Zip Encoding Class</a></li>
    340. 

  340. </ul>
    341. 

  341. </li>
    342. 

  342. </ul>
    343. 

  343. <ul>
    344. 

  344. <li class="toctree-l1"><a class="reference internal" href="../database/index.html">Database Reference</a><ul>
    345. 

  345. <li class="toctree-l2"><a class="reference internal" href="../database/examples.html">Quick Start: Usage Examples</a></li>
    346. 

  346. <li class="toctree-l2"><a class="reference internal" href="../database/configuration.html">Database Configuration</a></li>
    347. 

  347. <li class="toctree-l2"><a class="reference internal" href="../database/connecting.html">Connecting to a Database</a></li>
    348. 

  348. <li class="toctree-l2"><a class="reference internal" href="../database/queries.html">Running Queries</a></li>
    349. 

  349. <li class="toctree-l2"><a class="reference internal" href="../database/results.html">Generating Query Results</a></li>
    350. 

  350. <li class="toctree-l2"><a class="reference internal" href="../database/helpers.html">Query Helper Functions</a></li>
    351. 

  351. <li class="toctree-l2"><a class="reference internal" href="../database/query_builder.html">Query Builder Class</a></li>
    352. 

  352. <li class="toctree-l2"><a class="reference internal" href="../database/transactions.html">Transactions</a></li>
    353. 

  353. <li class="toctree-l2"><a class="reference internal" href="../database/metadata.html">Getting MetaData</a></li>
    354. 

  354. <li class="toctree-l2"><a class="reference internal" href="../database/call_function.html">Custom Function Calls</a></li>
    355. 

  355. <li class="toctree-l2"><a class="reference internal" href="../database/caching.html">Query Caching</a></li>
    356. 

  356. <li class="toctree-l2"><a class="reference internal" href="../database/forge.html">Database Manipulation with Database Forge</a></li>
    357. 

  357. <li class="toctree-l2"><a class="reference internal" href="../database/utilities.html">Database Utilities Class</a></li>
    358. 

  358. <li class="toctree-l2"><a class="reference internal" href="../database/db_driver_reference.html">Database Driver Reference</a></li>
    359. 

  359. </ul>
    360. 

  360. </li>
    361. 

  361. </ul>
    362. 

  362. <ul>
    363. 

  363. <li class="toctree-l1"><a class="reference internal" href="../helpers/index.html">Helpers</a><ul>
    364. 

  364. <li class="toctree-l2"><a class="reference internal" href="../helpers/array_helper.html">Array Helper</a></li>
    365. 

  365. <li class="toctree-l2"><a class="reference internal" href="../helpers/captcha_helper.html">CAPTCHA Helper</a></li>
    366. 

  366. <li class="toctree-l2"><a class="reference internal" href="../helpers/cookie_helper.html">Cookie Helper</a></li>
    367. 

  367. <li class="toctree-l2"><a class="reference internal" href="../helpers/date_helper.html">Date Helper</a></li>
    368. 

  368. <li class="toctree-l2"><a class="reference internal" href="../helpers/directory_helper.html">Directory Helper</a></li>
    369. 

  369. <li class="toctree-l2"><a class="reference internal" href="../helpers/download_helper.html">Download Helper</a></li>
    370. 

  370. <li class="toctree-l2"><a class="reference internal" href="../helpers/email_helper.html">Email Helper</a></li>
    371. 

  371. <li class="toctree-l2"><a class="reference internal" href="../helpers/file_helper.html">File Helper</a></li>
    372. 

  372. <li class="toctree-l2"><a class="reference internal" href="../helpers/form_helper.html">Form Helper</a></li>
    373. 

  373. <li class="toctree-l2"><a class="reference internal" href="../helpers/html_helper.html">HTML Helper</a></li>
    374. 

  374. <li class="toctree-l2"><a class="reference internal" href="../helpers/inflector_helper.html">Inflector Helper</a></li>
    375. 

  375. <li class="toctree-l2"><a class="reference internal" href="../helpers/language_helper.html">Language Helper</a></li>
    376. 

  376. <li class="toctree-l2"><a class="reference internal" href="../helpers/number_helper.html">Number Helper</a></li>
    377. 

  377. <li class="toctree-l2"><a class="reference internal" href="../helpers/path_helper.html">Path Helper</a></li>
    378. 

  378. <li class="toctree-l2"><a class="reference internal" href="../helpers/security_helper.html">Security Helper</a></li>
    379. 

  379. <li class="toctree-l2"><a class="reference internal" href="../helpers/smiley_helper.html">Smiley Helper</a></li>
    380. 

  380. <li class="toctree-l2"><a class="reference internal" href="../helpers/string_helper.html">String Helper</a></li>
    381. 

  381. <li class="toctree-l2"><a class="reference internal" href="../helpers/text_helper.html">Text Helper</a></li>
    382. 

  382. <li class="toctree-l2"><a class="reference internal" href="../helpers/typography_helper.html">Typography Helper</a></li>
    383. 

  383. <li class="toctree-l2"><a class="reference internal" href="../helpers/url_helper.html">URL Helper</a></li>
    384. 

  384. <li class="toctree-l2"><a class="reference internal" href="../helpers/xml_helper.html">XML Helper</a></li>
    385. 

  385. </ul>
    386. 

  386. </li>
    387. 

  387. </ul>
    388. 

  388. 

  389.           
    390. 

  390.         
    391. 

  391.       </div>
    392. 

  392.       &nbsp;
    393. 

  393.     </nav>
    394. 

  394. 

  395.     <section data-toggle="wy-nav-shift" class="wy-nav-content-wrap">
    396. 

  396. 

  397.       
    398. 

  398.       <nav class="wy-nav-top" role="navigation" aria-label="top navigation">
    399. 

  399.         <i data-toggle="wy-nav-top" class="fa fa-bars"></i>
    400. 

  400.         <a href="../index.html">CodeIgniter</a>
    401. 

  401.       </nav>
    402. 

  402. 

  403. 

  404.       
    405. 

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    409. 

  409.     <li><a href="../index.html">Docs</a> &raquo;</li>
    410. 

  410.       
    411. 

  411.         <li><a href="index.html">Libraries</a> &raquo;</li>
    412. 

  412.       
    413. 

  413.     <li>Caching Driver</li>
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  414.     <li class="wy-breadcrumbs-aside">
    415. 

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  417.     <div style="float:right;margin-left:5px;" id="closeMe">
    418. 

  418.       <img title="Classic Layout" alt="classic layout" src="data:image/gif;base64,R0lGODlhFAAUAJEAAAAAADMzM////wAAACH5BAUUAAIALAAAAAAUABQAAAImlI+py+0PU5gRBRDM3DxbWoXis42X13USOLauUIqnlsaH/eY6UwAAOw==" />
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    421. 

  421.   <hr/>
    422. 

  422. </div>
    423. 

  423.           <div role="main" class="document">
    424. 

  424.             
    425. 

  425.   <div class="section" id="caching-driver">
    426. 

  426. <h1>Caching Driver<a class="headerlink" href="#caching-driver" title="Permalink to this headline">¶</a></h1>
    427. 

  427. <p>CodeIgniter features wrappers around some of the most popular forms of
    428. 

  428. fast and dynamic caching. All but file-based caching require specific
    429. 

  429. server requirements, and a Fatal Exception will be thrown if server
    430. 

  430. requirements are not met.</p>
    431. 

  431. <div class="contents local topic" id="contents">
    432. 

  432. <ul class="simple">
    433. 

  433. <li><a class="reference internal" href="#example-usage" id="id1">Example Usage</a></li>
    434. 

  434. <li><a class="reference internal" href="#class-reference" id="id2">Class Reference</a></li>
    435. 

  435. <li><a class="reference internal" href="#drivers" id="id3">Drivers</a><ul>
    436. 

  436. <li><a class="reference internal" href="#alternative-php-cache-apc-caching" id="id4">Alternative PHP Cache (APC) Caching</a></li>
    437. 

  437. <li><a class="reference internal" href="#file-based-caching" id="id5">File-based Caching</a></li>
    438. 

  438. <li><a class="reference internal" href="#memcached-caching" id="id6">Memcached Caching</a></li>
    439. 

  439. <li><a class="reference internal" href="#wincache-caching" id="id7">WinCache Caching</a></li>
    440. 

  440. <li><a class="reference internal" href="#redis-caching" id="id8">Redis Caching</a></li>
    441. 

  441. <li><a class="reference internal" href="#dummy-cache" id="id9">Dummy Cache</a></li>
    442. 

  442. </ul>
    443. 

  443. </li>
    444. 

  444. </ul>
    445. 

  445. </div>
    446. 

  446. <div class="custom-index container"></div><div class="section" id="example-usage">
    447. 

  447. <h2><a class="toc-backref" href="#id1">Example Usage</a><a class="headerlink" href="#example-usage" title="Permalink to this headline">¶</a></h2>
    448. 

  448. <p>The following example will load the cache driver, specify <a class="reference external" href="#alternative-php-cache-apc-caching">APC</a>
    449. 

  449. as the driver to use, and fall back to file-based caching if APC is not
    450. 

  450. available in the hosting environment.</p>
    451. 

  451. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">,</span> <span class="k">array</span><span class="p">(</span><span class="s1">&#39;adapter&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;apc&#39;</span><span class="p">,</span> <span class="s1">&#39;backup&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;file&#39;</span><span class="p">));</span>
    452. 

  452. 

  453. <span class="k">if</span> <span class="p">(</span> <span class="o">!</span> <span class="nv">$foo</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">))</span>
    454. 

  454. <span class="p">{</span>
    455. 

  455.         <span class="k">echo</span> <span class="s1">&#39;Saving to the cache!&lt;br /&gt;&#39;</span><span class="p">;</span>
    456. 

  456.         <span class="nv">$foo</span> <span class="o">=</span> <span class="s1">&#39;foobarbaz!&#39;</span><span class="p">;</span>
    457. 

  457. 

  458.         <span class="c1">// Save into the cache for 5 minutes</span>
    459. 

  459.         <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="nv">$foo</span><span class="p">,</span> <span class="mi">300</span><span class="p">);</span>
    460. 

  460. <span class="p">}</span>
    461. 

  461. 

  462. <span class="k">echo</span> <span class="nv">$foo</span><span class="p">;</span>
    463. 

  463. </pre></div>
    464. 

  464. </div>
    465. 

  465. <p>You can also prefix cache item names via the <strong>key_prefix</strong> setting, which is useful
    466. 

  466. to avoid collisions when you’re running multiple applications on the same environment.</p>
    467. 

  467. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">,</span>
    468. 

  468.         <span class="k">array</span><span class="p">(</span><span class="s1">&#39;adapter&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;apc&#39;</span><span class="p">,</span> <span class="s1">&#39;backup&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;file&#39;</span><span class="p">,</span> <span class="s1">&#39;key_prefix&#39;</span> <span class="o">=&gt;</span> <span class="s1">&#39;my_&#39;</span><span class="p">)</span>
    469. 

  469. <span class="p">);</span>
    470. 

  470. 

  471. <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">);</span> <span class="c1">// Will get the cache entry named &#39;my_foo&#39;</span>
    472. 

  472. </pre></div>
    473. 

  473. </div>
    474. 

  474. </div>
    475. 

  475. <div class="section" id="class-reference">
    476. 

  476. <h2><a class="toc-backref" href="#id2">Class Reference</a><a class="headerlink" href="#class-reference" title="Permalink to this headline">¶</a></h2>
    477. 

  477. <dl class="class">
    478. 

  478. <dt id="CI_Cache">
    479. 

  479. <em class="property">class </em><code class="descname">CI_Cache</code><a class="headerlink" href="#CI_Cache" title="Permalink to this definition">¶</a></dt>
    480. 

  480. <dd><dl class="method">
    481. 

  481. <dt id="CI_Cache::is_supported">
    482. 

  482. <code class="descname">is_supported</code><span class="sig-paren">(</span><em>$driver</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::is_supported" title="Permalink to this definition">¶</a></dt>
    483. 

  483. <dd><table class="docutils field-list" frame="void" rules="none">
    484. 

  484. <col class="field-name" />
    485. 

  485. <col class="field-body" />
    486. 

  486. <tbody valign="top">
    487. 

  487. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    488. 

  488. <li><strong>$driver</strong> (<em>string</em>) – the name of the caching driver</li>
    489. 

  489. </ul>
    490. 

  490. </td>
    491. 

  491. </tr>
    492. 

  492. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if supported, FALSE if not</p>
    493. 

  493. </td>
    494. 

  494. </tr>
    495. 

  495. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
    496. 

  496. </td>
    497. 

  497. </tr>
    498. 

  498. </tbody>
    499. 

  499. </table>
    500. 

  500. <p>This method is automatically called when accessing drivers via
    501. 

  501. <code class="docutils literal"><span class="pre">$this-&gt;cache-&gt;get()</span></code>. However, if the individual drivers are used,
    502. 

  502. make sure to call this method to ensure the driver is supported in the
    503. 

  503. hosting environment.</p>
    504. 

  504. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="k">if</span> <span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">apc</span><span class="o">-&gt;</span><span class="na">is_supported</span><span class="p">())</span>
    505. 

  505. <span class="p">{</span>
    506. 

  506.         <span class="k">if</span> <span class="p">(</span><span class="nv">$data</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">apc</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;my_cache&#39;</span><span class="p">))</span>
    507. 

  507.         <span class="p">{</span>
    508. 

  508.                 <span class="c1">// do things.</span>
    509. 

  509.         <span class="p">}</span>
    510. 

  510. <span class="p">}</span>
    511. 

  511. </pre></div>
    512. 

  512. </div>
    513. 

  513. </dd></dl>
    514. 

  514. 

  515. <dl class="method">
    516. 

  516. <dt id="CI_Cache::get">
    517. 

  517. <code class="descname">get</code><span class="sig-paren">(</span><em>$id</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::get" title="Permalink to this definition">¶</a></dt>
    518. 

  518. <dd><table class="docutils field-list" frame="void" rules="none">
    519. 

  519. <col class="field-name" />
    520. 

  520. <col class="field-body" />
    521. 

  521. <tbody valign="top">
    522. 

  522. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    523. 

  523. <li><strong>$id</strong> (<em>string</em>) – Cache item name</li>
    524. 

  524. </ul>
    525. 

  525. </td>
    526. 

  526. </tr>
    527. 

  527. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Item value or FALSE if not found</p>
    528. 

  528. </td>
    529. 

  529. </tr>
    530. 

  530. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
    531. 

  531. </td>
    532. 

  532. </tr>
    533. 

  533. </tbody>
    534. 

  534. </table>
    535. 

  535. <p>This method will attempt to fetch an item from the cache store. If the
    536. 

  536. item does not exist, the method will return FALSE.</p>
    537. 

  537. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$foo</span> <span class="o">=</span> <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get</span><span class="p">(</span><span class="s1">&#39;my_cached_item&#39;</span><span class="p">);</span>
    538. 

  538. </pre></div>
    539. 

  539. </div>
    540. 

  540. </dd></dl>
    541. 

  541. 

  542. <dl class="method">
    543. 

  543. <dt id="CI_Cache::save">
    544. 

  544. <code class="descname">save</code><span class="sig-paren">(</span><em>$id</em>, <em>$data</em><span class="optional">[</span>, <em>$ttl = 60</em><span class="optional">[</span>, <em>$raw = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::save" title="Permalink to this definition">¶</a></dt>
    545. 

  545. <dd><table class="docutils field-list" frame="void" rules="none">
    546. 

  546. <col class="field-name" />
    547. 

  547. <col class="field-body" />
    548. 

  548. <tbody valign="top">
    549. 

  549. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    550. 

  550. <li><strong>$id</strong> (<em>string</em>) – Cache item name</li>
    551. 

  551. <li><strong>$data</strong> (<em>mixed</em>) – the data to save</li>
    552. 

  552. <li><strong>$ttl</strong> (<em>int</em>) – Time To Live, in seconds (default 60)</li>
    553. 

  553. <li><strong>$raw</strong> (<em>bool</em>) – Whether to store the raw value</li>
    554. 

  554. </ul>
    555. 

  555. </td>
    556. 

  556. </tr>
    557. 

  557. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
    558. 

  558. </td>
    559. 

  559. </tr>
    560. 

  560. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
    561. 

  561. </td>
    562. 

  562. </tr>
    563. 

  563. </tbody>
    564. 

  564. </table>
    565. 

  565. <p>This method will save an item to the cache store. If saving fails, the
    566. 

  566. method will return FALSE.</p>
    567. 

  567. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;cache_item_id&#39;</span><span class="p">,</span> <span class="s1">&#39;data_to_cache&#39;</span><span class="p">);</span>
    568. 

  568. </pre></div>
    569. 

  569. </div>
    570. 

  570. <div class="admonition note">
    571. 

  571. <p class="first admonition-title">Note</p>
    572. 

  572. <p class="last">The <code class="docutils literal"><span class="pre">$raw</span></code> parameter is only utilized by APC and Memcache,
    573. 

  573. in order to allow usage of <code class="docutils literal"><span class="pre">increment()</span></code> and <code class="docutils literal"><span class="pre">decrement()</span></code>.</p>
    574. 

  574. </div>
    575. 

  575. </dd></dl>
    576. 

  576. 

  577. <dl class="method">
    578. 

  578. <dt id="CI_Cache::delete">
    579. 

  579. <code class="descname">delete</code><span class="sig-paren">(</span><em>$id</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::delete" title="Permalink to this definition">¶</a></dt>
    580. 

  580. <dd><table class="docutils field-list" frame="void" rules="none">
    581. 

  581. <col class="field-name" />
    582. 

  582. <col class="field-body" />
    583. 

  583. <tbody valign="top">
    584. 

  584. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    585. 

  585. <li><strong>$id</strong> (<em>string</em>) – name of cached item</li>
    586. 

  586. </ul>
    587. 

  587. </td>
    588. 

  588. </tr>
    589. 

  589. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE on success, FALSE on failure</p>
    590. 

  590. </td>
    591. 

  591. </tr>
    592. 

  592. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
    593. 

  593. </td>
    594. 

  594. </tr>
    595. 

  595. </tbody>
    596. 

  596. </table>
    597. 

  597. <p>This method will delete a specific item from the cache store. If item
    598. 

  598. deletion fails, the method will return FALSE.</p>
    599. 

  599. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">delete</span><span class="p">(</span><span class="s1">&#39;cache_item_id&#39;</span><span class="p">);</span>
    600. 

  600. </pre></div>
    601. 

  601. </div>
    602. 

  602. </dd></dl>
    603. 

  603. 

  604. <dl class="method">
    605. 

  605. <dt id="CI_Cache::increment">
    606. 

  606. <code class="descname">increment</code><span class="sig-paren">(</span><em>$id</em><span class="optional">[</span>, <em>$offset = 1</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::increment" title="Permalink to this definition">¶</a></dt>
    607. 

  607. <dd><table class="docutils field-list" frame="void" rules="none">
    608. 

  608. <col class="field-name" />
    609. 

  609. <col class="field-body" />
    610. 

  610. <tbody valign="top">
    611. 

  611. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    612. 

  612. <li><strong>$id</strong> (<em>string</em>) – Cache ID</li>
    613. 

  613. <li><strong>$offset</strong> (<em>int</em>) – Step/value to add</li>
    614. 

  614. </ul>
    615. 

  615. </td>
    616. 

  616. </tr>
    617. 

  617. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">New value on success, FALSE on failure</p>
    618. 

  618. </td>
    619. 

  619. </tr>
    620. 

  620. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
    621. 

  621. </td>
    622. 

  622. </tr>
    623. 

  623. </tbody>
    624. 

  624. </table>
    625. 

  625. <p>Performs atomic incrementation of a raw stored value.</p>
    626. 

  626. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// &#39;iterator&#39; has a value of 2</span>
    627. 

  627. 

  628. <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">increment</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 3</span>
    629. 

  629. 

  630. <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">increment</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">,</span> <span class="mi">3</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 6</span>
    631. 

  631. </pre></div>
    632. 

  632. </div>
    633. 

  633. </dd></dl>
    634. 

  634. 

  635. <dl class="method">
    636. 

  636. <dt id="CI_Cache::decrement">
    637. 

  637. <code class="descname">decrement</code><span class="sig-paren">(</span><em>$id</em><span class="optional">[</span>, <em>$offset = 1</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::decrement" title="Permalink to this definition">¶</a></dt>
    638. 

  638. <dd><table class="docutils field-list" frame="void" rules="none">
    639. 

  639. <col class="field-name" />
    640. 

  640. <col class="field-body" />
    641. 

  641. <tbody valign="top">
    642. 

  642. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    643. 

  643. <li><strong>$id</strong> (<em>string</em>) – Cache ID</li>
    644. 

  644. <li><strong>$offset</strong> (<em>int</em>) – Step/value to reduce by</li>
    645. 

  645. </ul>
    646. 

  646. </td>
    647. 

  647. </tr>
    648. 

  648. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">New value on success, FALSE on failure</p>
    649. 

  649. </td>
    650. 

  650. </tr>
    651. 

  651. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
    652. 

  652. </td>
    653. 

  653. </tr>
    654. 

  654. </tbody>
    655. 

  655. </table>
    656. 

  656. <p>Performs atomic decrementation of a raw stored value.</p>
    657. 

  657. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="c1">// &#39;iterator&#39; has a value of 6</span>
    658. 

  658. 

  659. <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">decrement</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 5</span>
    660. 

  660. 

  661. <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">decrement</span><span class="p">(</span><span class="s1">&#39;iterator&#39;</span><span class="p">,</span> <span class="mi">2</span><span class="p">);</span> <span class="c1">// &#39;iterator&#39; is now 3</span>
    662. 

  662. </pre></div>
    663. 

  663. </div>
    664. 

  664. </dd></dl>
    665. 

  665. 

  666. <dl class="method">
    667. 

  667. <dt id="CI_Cache::clean">
    668. 

  668. <code class="descname">clean</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::clean" title="Permalink to this definition">¶</a></dt>
    669. 

  669. <dd><table class="docutils field-list" frame="void" rules="none">
    670. 

  670. <col class="field-name" />
    671. 

  671. <col class="field-body" />
    672. 

  672. <tbody valign="top">
    673. 

  673. <tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">TRUE on success, FALSE on failure</td>
    674. 

  674. </tr>
    675. 

  675. <tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">bool</td>
    676. 

  676. </tr>
    677. 

  677. </tbody>
    678. 

  678. </table>
    679. 

  679. <p>This method will ‘clean’ the entire cache. If the deletion of the
    680. 

  680. cache files fails, the method will return FALSE.</p>
    681. 

  681. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">clean</span><span class="p">();</span>
    682. 

  682. </pre></div>
    683. 

  683. </div>
    684. 

  684. </dd></dl>
    685. 

  685. 

  686. <dl class="method">
    687. 

  687. <dt id="CI_Cache::cache_info">
    688. 

  688. <code class="descname">cache_info</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::cache_info" title="Permalink to this definition">¶</a></dt>
    689. 

  689. <dd><table class="docutils field-list" frame="void" rules="none">
    690. 

  690. <col class="field-name" />
    691. 

  691. <col class="field-body" />
    692. 

  692. <tbody valign="top">
    693. 

  693. <tr class="field-odd field"><th class="field-name">Returns:</th><td class="field-body">Information on the entire cache database</td>
    694. 

  694. </tr>
    695. 

  695. <tr class="field-even field"><th class="field-name">Return type:</th><td class="field-body">mixed</td>
    696. 

  696. </tr>
    697. 

  697. </tbody>
    698. 

  698. </table>
    699. 

  699. <p>This method will return information on the entire cache.</p>
    700. 

  700. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">var_dump</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">cache_info</span><span class="p">());</span>
    701. 

  701. </pre></div>
    702. 

  702. </div>
    703. 

  703. <div class="admonition note">
    704. 

  704. <p class="first admonition-title">Note</p>
    705. 

  705. <p class="last">The information returned and the structure of the data is dependent
    706. 

  706. on which adapter is being used.</p>
    707. 

  707. </div>
    708. 

  708. </dd></dl>
    709. 

  709. 

  710. <dl class="method">
    711. 

  711. <dt id="CI_Cache::get_metadata">
    712. 

  712. <code class="descname">get_metadata</code><span class="sig-paren">(</span><em>$id</em><span class="sig-paren">)</span><a class="headerlink" href="#CI_Cache::get_metadata" title="Permalink to this definition">¶</a></dt>
    713. 

  713. <dd><table class="docutils field-list" frame="void" rules="none">
    714. 

  714. <col class="field-name" />
    715. 

  715. <col class="field-body" />
    716. 

  716. <tbody valign="top">
    717. 

  717. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    718. 

  718. <li><strong>$id</strong> (<em>string</em>) – Cache item name</li>
    719. 

  719. </ul>
    720. 

  720. </td>
    721. 

  721. </tr>
    722. 

  722. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Metadata for the cached item</p>
    723. 

  723. </td>
    724. 

  724. </tr>
    725. 

  725. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
    726. 

  726. </td>
    727. 

  727. </tr>
    728. 

  728. </tbody>
    729. 

  729. </table>
    730. 

  730. <p>This method will return detailed information on a specific item in the
    731. 

  731. cache.</p>
    732. 

  732. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nb">var_dump</span><span class="p">(</span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">get_metadata</span><span class="p">(</span><span class="s1">&#39;my_cached_item&#39;</span><span class="p">));</span>
    733. 

  733. </pre></div>
    734. 

  734. </div>
    735. 

  735. <div class="admonition note">
    736. 

  736. <p class="first admonition-title">Note</p>
    737. 

  737. <p class="last">The information returned and the structure of the data is dependent
    738. 

  738. on which adapter is being used.</p>
    739. 

  739. </div>
    740. 

  740. </dd></dl>
    741. 

  741. 

  742. </dd></dl>
    743. 

  743. 

  744. </div>
    745. 

  745. <div class="section" id="drivers">
    746. 

  746. <h2><a class="toc-backref" href="#id3">Drivers</a><a class="headerlink" href="#drivers" title="Permalink to this headline">¶</a></h2>
    747. 

  747. <div class="section" id="alternative-php-cache-apc-caching">
    748. 

  748. <h3><a class="toc-backref" href="#id4">Alternative PHP Cache (APC) Caching</a><a class="headerlink" href="#alternative-php-cache-apc-caching" title="Permalink to this headline">¶</a></h3>
    749. 

  749. <p>All of the methods listed above can be accessed without passing a
    750. 

  750. specific adapter to the driver loader as follows:</p>
    751. 

  751. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
    752. 

  752. <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">apc</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
    753. 

  753. </pre></div>
    754. 

  754. </div>
    755. 

  755. <p>For more information on APC, please see
    756. 

  756. <a class="reference external" href="http://php.net/apc">http://php.net/apc</a>.</p>
    757. 

  757. </div>
    758. 

  758. <div class="section" id="file-based-caching">
    759. 

  759. <h3><a class="toc-backref" href="#id5">File-based Caching</a><a class="headerlink" href="#file-based-caching" title="Permalink to this headline">¶</a></h3>
    760. 

  760. <p>Unlike caching from the Output Class, the driver file-based caching
    761. 

  761. allows for pieces of view files to be cached. Use this with care, and
    762. 

  762. make sure to benchmark your application, as a point can come where disk
    763. 

  763. I/O will negate positive gains by caching.</p>
    764. 

  764. <p>All of the methods listed above can be accessed without passing a
    765. 

  765. specific adapter to the driver loader as follows:</p>
    766. 

  766. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
    767. 

  767. <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">file</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
    768. 

  768. </pre></div>
    769. 

  769. </div>
    770. 

  770. </div>
    771. 

  771. <div class="section" id="memcached-caching">
    772. 

  772. <h3><a class="toc-backref" href="#id6">Memcached Caching</a><a class="headerlink" href="#memcached-caching" title="Permalink to this headline">¶</a></h3>
    773. 

  773. <p>Multiple Memcached servers can be specified in the memcached.php
    774. 

  774. configuration file, located in the _application/config/* directory.</p>
    775. 

  775. <p>All of the methods listed above can be accessed without passing a
    776. 

  776. specific adapter to the driver loader as follows:</p>
    777. 

  777. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
    778. 

  778. <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">memcached</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
    779. 

  779. </pre></div>
    780. 

  780. </div>
    781. 

  781. <p>For more information on Memcached, please see
    782. 

  782. <a class="reference external" href="http://php.net/memcached">http://php.net/memcached</a>.</p>
    783. 

  783. </div>
    784. 

  784. <div class="section" id="wincache-caching">
    785. 

  785. <h3><a class="toc-backref" href="#id7">WinCache Caching</a><a class="headerlink" href="#wincache-caching" title="Permalink to this headline">¶</a></h3>
    786. 

  786. <p>Under Windows, you can also utilize the WinCache driver.</p>
    787. 

  787. <p>All of the methods listed above can be accessed without passing a
    788. 

  788. specific adapter to the driver loader as follows:</p>
    789. 

  789. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
    790. 

  790. <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">wincache</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
    791. 

  791. </pre></div>
    792. 

  792. </div>
    793. 

  793. <p>For more information on WinCache, please see
    794. 

  794. <a class="reference external" href="http://php.net/wincache">http://php.net/wincache</a>.</p>
    795. 

  795. </div>
    796. 

  796. <div class="section" id="redis-caching">
    797. 

  797. <h3><a class="toc-backref" href="#id8">Redis Caching</a><a class="headerlink" href="#redis-caching" title="Permalink to this headline">¶</a></h3>
    798. 

  798. <p>Redis is an in-memory key-value store which can operate in LRU cache mode.
    799. 

  799. To use it, you need <a class="reference external" href="https://github.com/phpredis/phpredis">Redis server and phpredis PHP extension</a>.</p>
    800. 

  800. <p>Config options to connect to redis server must be stored in the application/config/redis.php file.
    801. 

  801. Available options are:</p>
    802. 

  802. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;socket_type&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;tcp&#39;</span><span class="p">;</span> <span class="c1">//`tcp` or `unix`</span>
    803. 

  803. <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;socket&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;/var/run/redis.sock&#39;</span><span class="p">;</span> <span class="c1">// in case of `unix` socket type</span>
    804. 

  804. <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;host&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="s1">&#39;127.0.0.1&#39;</span><span class="p">;</span>
    805. 

  805. <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;password&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="k">NULL</span><span class="p">;</span>
    806. 

  806. <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;port&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">6379</span><span class="p">;</span>
    807. 

  807. <span class="nv">$config</span><span class="p">[</span><span class="s1">&#39;timeout&#39;</span><span class="p">]</span> <span class="o">=</span> <span class="mi">0</span><span class="p">;</span>
    808. 

  808. </pre></div>
    809. 

  809. </div>
    810. 

  810. <p>All of the methods listed above can be accessed without passing a
    811. 

  811. specific adapter to the driver loader as follows:</p>
    812. 

  812. <div class="highlight-ci"><div class="highlight"><pre><span></span><span class="nv">$this</span><span class="o">-&gt;</span><span class="na">load</span><span class="o">-&gt;</span><span class="na">driver</span><span class="p">(</span><span class="s1">&#39;cache&#39;</span><span class="p">);</span>
    813. 

  813. <span class="nv">$this</span><span class="o">-&gt;</span><span class="na">cache</span><span class="o">-&gt;</span><span class="na">redis</span><span class="o">-&gt;</span><span class="na">save</span><span class="p">(</span><span class="s1">&#39;foo&#39;</span><span class="p">,</span> <span class="s1">&#39;bar&#39;</span><span class="p">,</span> <span class="mi">10</span><span class="p">);</span>
    814. 

  814. </pre></div>
    815. 

  815. </div>
    816. 

  816. <p>For more information on Redis, please see
    817. 

  817. <a class="reference external" href="http://redis.io">http://redis.io</a>.</p>
    818. 

  818. </div>
    819. 

  819. <div class="section" id="dummy-cache">
    820. 

  820. <h3><a class="toc-backref" href="#id9">Dummy Cache</a><a class="headerlink" href="#dummy-cache" title="Permalink to this headline">¶</a></h3>
    821. 

  821. <p>This is a caching backend that will always ‘miss.’ It stores no data,
    822. 

  822. but lets you keep your caching code in place in environments that don’t
    823. 

  823. support your chosen cache.</p>
    824. 

  824. </div>
    825. 

  825. </div>
    826. 

  826. </div>
    827. 

  827. 

  828. 

  829.           </div>
    830. 

  830.           <footer>
    831. 

  831.   
    832. 

  832.     <div class="rst-footer-buttons" role="navigation" aria-label="footer navigation">
    833. 

  833.       
    834. 

  834.         <a href="calendar.html" class="btn btn-neutral float-right" title="Calendaring Class">Next <span class="fa fa-arrow-circle-right"></span></a>
    835. 

  835.       
    836. 

  836.       
    837. 

  837.         <a href="benchmark.html" class="btn btn-neutral" title="Benchmarking Class"><span class="fa fa-arrow-circle-left"></span> Previous</a>
    838. 

  838.       
    839. 

  839.     </div>
    840. 

  840.   
    841. 

  841. 

  842.   <hr/>
    843. 

  843. 

  844.   <div role="contentinfo">
    845. 

  845.     <p>
    846. 

  846.         &copy; Copyright 2014 - 2019, British Columbia Institute of Technology.
    847. 

  847.       Last updated on Sep 19, 2019.
    848. 

  848.     </p>
    849. 

  849.   </div>
    850. 

  850. 

  851.   Built with <a href="http://sphinx-doc.org/">Sphinx</a> using a <a href="https://github.com/snide/sphinx_rtd_theme">theme</a> provided by <a href="https://readthedocs.org">Read the Docs</a>.
    852. 

  852.   
    853. 

  853. </footer>
    854. 

  854.         </div>
    855. 

  855.       </div>
    856. 

  856. 

  857.     </section>
    858. 

  858. 

  859.   </div>
    860. 

  860.   
    861. 

  861. 

  862. 

  863.   
    864. 

  864. 

  865.     <script type="text/javascript">
    866. 

  866.         var DOCUMENTATION_OPTIONS = {
    867. 

  867.             URL_ROOT:'../',
    868. 

  868.             VERSION:'3.1.11',
    869. 

  869.             COLLAPSE_INDEX:false,
    870. 

  870.             FILE_SUFFIX:'.html',
    871. 

  871.             HAS_SOURCE:  false
    872. 

  872.         };
    873. 

  873.     </script>
    874. 

  874.       <script type="text/javascript" src="../_static/jquery.js"></script>
    875. 

  875.       <script type="text/javascript" src="../_static/underscore.js"></script>
    876. 

  876.       <script type="text/javascript" src="../_static/doctools.js"></script>
    877. 

  877. 

  878.   
    879. 

  879. 

  880.   
    881. 

  881.   
    882. 

  882.     <script type="text/javascript" src="../_static/js/theme.js"></script>
    883. 

  883.   
    884. 

  884. 

  885.   
    886. 

  886.   
    887. 

  887.   <script type="text/javascript">
    888. 

  888.       jQuery(function () {
    889. 

  889.           SphinxRtdTheme.StickyNav.enable();
    890. 

  890.       });
    891. 

  891.   </script>
    892. 

  892.    
    893. 

  893. 

  894. </body>
    895. 

  895. </html>
    896.