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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="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 class="current">
    278. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  294. <li class="toctree-l2 current"><a class="current reference internal" href="#">Compatibility Functions</a></li>
    295. 

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

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

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

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

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

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

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

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

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

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

  305. </ul>
    306. 

  306. </li>
    307. 

  307. </ul>
    308. 

  308. <ul>
    309. 

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

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

  311. <li class="toctree-l2"><a class="reference internal" href="../libraries/caching.html">Caching Driver</a></li>
    312. 

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

  339. <li class="toctree-l2"><a class="reference internal" href="../libraries/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. 

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  410.       
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  411.         <li><a href="index.html">General Topics</a> &raquo;</li>
    412. 

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    413. 

  413.     <li>Compatibility Functions</li>
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  423.           <div role="main" class="document">
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  424.             
    425. 

  425.   <div class="section" id="compatibility-functions">
    426. 

  426. <h1>Compatibility Functions<a class="headerlink" href="#compatibility-functions" title="Permalink to this headline">¶</a></h1>
    427. 

  427. <p>CodeIgniter provides a set of compatibility functions that enable
    428. 

  428. you to use functions what are otherwise natively available in PHP,
    429. 

  429. but only in higher versions or depending on a certain extension.</p>
    430. 

  430. <p>Being custom implementations, these functions will also have some
    431. 

  431. set of dependencies on their own, but are still useful if your
    432. 

  432. PHP setup doesn’t offer them natively.</p>
    433. 

  433. <div class="admonition note">
    434. 

  434. <p class="first admonition-title">Note</p>
    435. 

  435. <p class="last">Much like the <a class="reference internal" href="common_functions.html"><span class="doc">common functions</span></a>, the
    436. 

  436. compatibility functions are always available, as long as
    437. 

  437. their dependencies are met.</p>
    438. 

  438. </div>
    439. 

  439. <div class="contents local topic" id="contents">
    440. 

  440. <ul class="simple">
    441. 

  441. <li><a class="reference internal" href="#password-hashing" id="id7">Password Hashing</a><ul>
    442. 

  442. <li><a class="reference internal" href="#dependencies" id="id8">Dependencies</a></li>
    443. 

  443. <li><a class="reference internal" href="#constants" id="id9">Constants</a></li>
    444. 

  444. <li><a class="reference internal" href="#function-reference" id="id10">Function reference</a></li>
    445. 

  445. </ul>
    446. 

  446. </li>
    447. 

  447. <li><a class="reference internal" href="#hash-message-digest" id="id11">Hash (Message Digest)</a><ul>
    448. 

  448. <li><a class="reference internal" href="#id1" id="id12">Dependencies</a></li>
    449. 

  449. <li><a class="reference internal" href="#id2" id="id13">Function reference</a></li>
    450. 

  450. </ul>
    451. 

  451. </li>
    452. 

  452. <li><a class="reference internal" href="#multibyte-string" id="id14">Multibyte String</a><ul>
    453. 

  453. <li><a class="reference internal" href="#id3" id="id15">Dependencies</a></li>
    454. 

  454. <li><a class="reference internal" href="#id4" id="id16">Function reference</a></li>
    455. 

  455. </ul>
    456. 

  456. </li>
    457. 

  457. <li><a class="reference internal" href="#standard-functions" id="id17">Standard Functions</a><ul>
    458. 

  458. <li><a class="reference internal" href="#id5" id="id18">Dependencies</a></li>
    459. 

  459. <li><a class="reference internal" href="#id6" id="id19">Function reference</a></li>
    460. 

  460. </ul>
    461. 

  461. </li>
    462. 

  462. </ul>
    463. 

  463. </div>
    464. 

  464. <div class="custom-index container"></div><div class="section" id="password-hashing">
    465. 

  465. <h2><a class="toc-backref" href="#id7">Password Hashing</a><a class="headerlink" href="#password-hashing" title="Permalink to this headline">¶</a></h2>
    466. 

  466. <p>This set of compatibility functions offers a “backport” of PHP’s
    467. 

  467. standard <a class="reference external" href="http://php.net/password">Password Hashing extension</a>
    468. 

  468. that is otherwise available only since PHP 5.5.</p>
    469. 

  469. <div class="section" id="dependencies">
    470. 

  470. <h3><a class="toc-backref" href="#id8">Dependencies</a><a class="headerlink" href="#dependencies" title="Permalink to this headline">¶</a></h3>
    471. 

  471. <ul class="simple">
    472. 

  472. <li>PHP 5.3.7</li>
    473. 

  473. <li><code class="docutils literal"><span class="pre">CRYPT_BLOWFISH</span></code> support for <code class="docutils literal"><span class="pre">crypt()</span></code></li>
    474. 

  474. </ul>
    475. 

  475. </div>
    476. 

  476. <div class="section" id="constants">
    477. 

  477. <h3><a class="toc-backref" href="#id9">Constants</a><a class="headerlink" href="#constants" title="Permalink to this headline">¶</a></h3>
    478. 

  478. <ul class="simple">
    479. 

  479. <li><code class="docutils literal"><span class="pre">PASSWORD_BCRYPT</span></code></li>
    480. 

  480. <li><code class="docutils literal"><span class="pre">PASSWORD_DEFAULT</span></code></li>
    481. 

  481. </ul>
    482. 

  482. </div>
    483. 

  483. <div class="section" id="function-reference">
    484. 

  484. <h3><a class="toc-backref" href="#id10">Function reference</a><a class="headerlink" href="#function-reference" title="Permalink to this headline">¶</a></h3>
    485. 

  485. <dl class="function">
    486. 

  486. <dt id="password_get_info">
    487. 

  487. <code class="descname">password_get_info</code><span class="sig-paren">(</span><em>$hash</em><span class="sig-paren">)</span><a class="headerlink" href="#password_get_info" title="Permalink to this definition">¶</a></dt>
    488. 

  488. <dd><table class="docutils field-list" frame="void" rules="none">
    489. 

  489. <col class="field-name" />
    490. 

  490. <col class="field-body" />
    491. 

  491. <tbody valign="top">
    492. 

  492. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    493. 

  493. <li><strong>$hash</strong> (<em>string</em>) – Password hash</li>
    494. 

  494. </ul>
    495. 

  495. </td>
    496. 

  496. </tr>
    497. 

  497. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Information about the hashed password</p>
    498. 

  498. </td>
    499. 

  499. </tr>
    500. 

  500. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p>
    501. 

  501. </td>
    502. 

  502. </tr>
    503. 

  503. </tbody>
    504. 

  504. </table>
    505. 

  505. <p>For more information, please refer to the <a class="reference external" href="http://php.net/password_get_info">PHP manual for
    506. 

  506. password_get_info()</a>.</p>
    507. 

  507. </dd></dl>
    508. 

  508. 

  509. <dl class="function">
    510. 

  510. <dt id="password_hash">
    511. 

  511. <code class="descname">password_hash</code><span class="sig-paren">(</span><em>$password</em>, <em>$algo</em><span class="optional">[</span>, <em>$options = array()</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#password_hash" title="Permalink to this definition">¶</a></dt>
    512. 

  512. <dd><table class="docutils field-list" frame="void" rules="none">
    513. 

  513. <col class="field-name" />
    514. 

  514. <col class="field-body" />
    515. 

  515. <tbody valign="top">
    516. 

  516. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    517. 

  517. <li><strong>$password</strong> (<em>string</em>) – Plain-text password</li>
    518. 

  518. <li><strong>$algo</strong> (<em>int</em>) – Hashing algorithm</li>
    519. 

  519. <li><strong>$options</strong> (<em>array</em>) – Hashing options</li>
    520. 

  520. </ul>
    521. 

  521. </td>
    522. 

  522. </tr>
    523. 

  523. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Hashed password or FALSE on failure</p>
    524. 

  524. </td>
    525. 

  525. </tr>
    526. 

  526. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
    527. 

  527. </td>
    528. 

  528. </tr>
    529. 

  529. </tbody>
    530. 

  530. </table>
    531. 

  531. <p>For more information, please refer to the <a class="reference external" href="http://php.net/password_hash">PHP manual for
    532. 

  532. password_hash()</a>.</p>
    533. 

  533. <div class="admonition note">
    534. 

  534. <p class="first admonition-title">Note</p>
    535. 

  535. <p class="last">Unless you provide your own (and valid) salt, this function
    536. 

  536. has a further dependency on an available CSPRNG source. Each
    537. 

  537. of the following would satisfy that:
    538. 

  538. - <code class="docutils literal"><span class="pre">mcrypt_create_iv()</span></code> with <code class="docutils literal"><span class="pre">MCRYPT_DEV_URANDOM</span></code>
    539. 

  539. - <code class="docutils literal"><span class="pre">openssl_random_pseudo_bytes()</span></code>
    540. 

  540. - /dev/arandom
    541. 

  541. - /dev/urandom</p>
    542. 

  542. </div>
    543. 

  543. </dd></dl>
    544. 

  544. 

  545. <dl class="function">
    546. 

  546. <dt id="password_needs_rehash">
    547. 

  547. <code class="descname">password_needs_rehash</code><span class="sig-paren">(</span><span class="sig-paren">)</span><a class="headerlink" href="#password_needs_rehash" title="Permalink to this definition">¶</a></dt>
    548. 

  548. <dd><table class="docutils field-list" frame="void" rules="none">
    549. 

  549. <col class="field-name" />
    550. 

  550. <col class="field-body" />
    551. 

  551. <tbody valign="top">
    552. 

  552. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    553. 

  553. <li><strong>$hash</strong> (<em>string</em>) – Password hash</li>
    554. 

  554. <li><strong>$algo</strong> (<em>int</em>) – Hashing algorithm</li>
    555. 

  555. <li><strong>$options</strong> (<em>array</em>) – Hashing options</li>
    556. 

  556. </ul>
    557. 

  557. </td>
    558. 

  558. </tr>
    559. 

  559. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the hash should be rehashed to match the given algorithm and options, FALSE otherwise</p>
    560. 

  560. </td>
    561. 

  561. </tr>
    562. 

  562. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
    563. 

  563. </td>
    564. 

  564. </tr>
    565. 

  565. </tbody>
    566. 

  566. </table>
    567. 

  567. <p>For more information, please refer to the <a class="reference external" href="http://php.net/password_needs_rehash">PHP manual for
    568. 

  568. password_needs_rehash()</a>.</p>
    569. 

  569. </dd></dl>
    570. 

  570. 

  571. <dl class="function">
    572. 

  572. <dt id="password_verify">
    573. 

  573. <code class="descname">password_verify</code><span class="sig-paren">(</span><em>$password</em>, <em>$hash</em><span class="sig-paren">)</span><a class="headerlink" href="#password_verify" title="Permalink to this definition">¶</a></dt>
    574. 

  574. <dd><table class="docutils field-list" frame="void" rules="none">
    575. 

  575. <col class="field-name" />
    576. 

  576. <col class="field-body" />
    577. 

  577. <tbody valign="top">
    578. 

  578. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    579. 

  579. <li><strong>$password</strong> (<em>string</em>) – Plain-text password</li>
    580. 

  580. <li><strong>$hash</strong> (<em>string</em>) – Password hash</li>
    581. 

  581. </ul>
    582. 

  582. </td>
    583. 

  583. </tr>
    584. 

  584. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the password matches the hash, FALSE if not</p>
    585. 

  585. </td>
    586. 

  586. </tr>
    587. 

  587. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">bool</p>
    588. 

  588. </td>
    589. 

  589. </tr>
    590. 

  590. </tbody>
    591. 

  591. </table>
    592. 

  592. <p>For more information, please refer to the <a class="reference external" href="http://php.net/password_verify">PHP manual for
    593. 

  593. password_verify()</a>.</p>
    594. 

  594. </dd></dl>
    595. 

  595. 

  596. </div>
    597. 

  597. </div>
    598. 

  598. <div class="section" id="hash-message-digest">
    599. 

  599. <h2><a class="toc-backref" href="#id11">Hash (Message Digest)</a><a class="headerlink" href="#hash-message-digest" title="Permalink to this headline">¶</a></h2>
    600. 

  600. <p>This compatibility layer contains backports for the <code class="docutils literal"><span class="pre">hash_equals()</span></code>
    601. 

  601. and <code class="docutils literal"><span class="pre">hash_pbkdf2()</span></code> functions, which otherwise require PHP 5.6 and/or
    602. 

  602. PHP 5.5 respectively.</p>
    603. 

  603. <div class="section" id="id1">
    604. 

  604. <h3><a class="toc-backref" href="#id12">Dependencies</a><a class="headerlink" href="#id1" title="Permalink to this headline">¶</a></h3>
    605. 

  605. <ul class="simple">
    606. 

  606. <li>None</li>
    607. 

  607. </ul>
    608. 

  608. </div>
    609. 

  609. <div class="section" id="id2">
    610. 

  610. <h3><a class="toc-backref" href="#id13">Function reference</a><a class="headerlink" href="#id2" title="Permalink to this headline">¶</a></h3>
    611. 

  611. <dl class="function">
    612. 

  612. <dt id="hash_equals">
    613. 

  613. <code class="descname">hash_equals</code><span class="sig-paren">(</span><em>$known_string</em>, <em>$user_string</em><span class="sig-paren">)</span><a class="headerlink" href="#hash_equals" title="Permalink to this definition">¶</a></dt>
    614. 

  614. <dd><table class="docutils field-list" frame="void" rules="none">
    615. 

  615. <col class="field-name" />
    616. 

  616. <col class="field-body" />
    617. 

  617. <tbody valign="top">
    618. 

  618. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    619. 

  619. <li><strong>$known_string</strong> (<em>string</em>) – Known string</li>
    620. 

  620. <li><strong>$user_string</strong> (<em>string</em>) – User-supplied string</li>
    621. 

  621. </ul>
    622. 

  622. </td>
    623. 

  623. </tr>
    624. 

  624. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">TRUE if the strings match, FALSE otherwise</p>
    625. 

  625. </td>
    626. 

  626. </tr>
    627. 

  627. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
    628. 

  628. </td>
    629. 

  629. </tr>
    630. 

  630. </tbody>
    631. 

  631. </table>
    632. 

  632. <p>For more information, please refer to the <a class="reference external" href="http://php.net/hash_equals">PHP manual for
    633. 

  633. hash_equals()</a>.</p>
    634. 

  634. </dd></dl>
    635. 

  635. 

  636. <dl class="function">
    637. 

  637. <dt id="hash_pbkdf2">
    638. 

  638. <code class="descname">hash_pbkdf2</code><span class="sig-paren">(</span><em>$algo</em>, <em>$password</em>, <em>$salt</em>, <em>$iterations</em><span class="optional">[</span>, <em>$length = 0</em><span class="optional">[</span>, <em>$raw_output = FALSE</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#hash_pbkdf2" title="Permalink to this definition">¶</a></dt>
    639. 

  639. <dd><table class="docutils field-list" frame="void" rules="none">
    640. 

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

  641. <col class="field-body" />
    642. 

  642. <tbody valign="top">
    643. 

  643. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    644. 

  644. <li><strong>$algo</strong> (<em>string</em>) – Hashing algorithm</li>
    645. 

  645. <li><strong>$password</strong> (<em>string</em>) – Password</li>
    646. 

  646. <li><strong>$salt</strong> (<em>string</em>) – Hash salt</li>
    647. 

  647. <li><strong>$iterations</strong> (<em>int</em>) – Number of iterations to perform during derivation</li>
    648. 

  648. <li><strong>$length</strong> (<em>int</em>) – Output string length</li>
    649. 

  649. <li><strong>$raw_output</strong> (<em>bool</em>) – Whether to return raw binary data</li>
    650. 

  650. </ul>
    651. 

  651. </td>
    652. 

  652. </tr>
    653. 

  653. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Password-derived key or FALSE on failure</p>
    654. 

  654. </td>
    655. 

  655. </tr>
    656. 

  656. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
    657. 

  657. </td>
    658. 

  658. </tr>
    659. 

  659. </tbody>
    660. 

  660. </table>
    661. 

  661. <p>For more information, please refer to the <a class="reference external" href="http://php.net/hash_pbkdf2">PHP manual for
    662. 

  662. hash_pbkdf2()</a>.</p>
    663. 

  663. </dd></dl>
    664. 

  664. 

  665. </div>
    666. 

  666. </div>
    667. 

  667. <div class="section" id="multibyte-string">
    668. 

  668. <h2><a class="toc-backref" href="#id14">Multibyte String</a><a class="headerlink" href="#multibyte-string" title="Permalink to this headline">¶</a></h2>
    669. 

  669. <p>This set of compatibility functions offers limited support for PHP’s
    670. 

  670. <a class="reference external" href="http://php.net/mbstring">Multibyte String extension</a>. Because of
    671. 

  671. the limited alternative solutions, only a few functions are available.</p>
    672. 

  672. <div class="admonition note">
    673. 

  673. <p class="first admonition-title">Note</p>
    674. 

  674. <p class="last">When a character set parameter is ommited,
    675. 

  675. <code class="docutils literal"><span class="pre">$config['charset']</span></code> will be used.</p>
    676. 

  676. </div>
    677. 

  677. <div class="section" id="id3">
    678. 

  678. <h3><a class="toc-backref" href="#id15">Dependencies</a><a class="headerlink" href="#id3" title="Permalink to this headline">¶</a></h3>
    679. 

  679. <ul class="simple">
    680. 

  680. <li><a class="reference external" href="http://php.net/iconv">iconv</a> extension</li>
    681. 

  681. </ul>
    682. 

  682. <div class="admonition important">
    683. 

  683. <p class="first admonition-title">Important</p>
    684. 

  684. <p class="last">This dependency is optional and these functions will
    685. 

  685. always be declared. If iconv is not available, they WILL
    686. 

  686. fall-back to their non-mbstring versions.</p>
    687. 

  687. </div>
    688. 

  688. <div class="admonition important">
    689. 

  689. <p class="first admonition-title">Important</p>
    690. 

  690. <p class="last">Where a character set is supplied, it must be
    691. 

  691. supported by iconv and in a format that it recognizes.</p>
    692. 

  692. </div>
    693. 

  693. <div class="admonition note">
    694. 

  694. <p class="first admonition-title">Note</p>
    695. 

  695. <p class="last">For you own dependency check on the actual mbstring
    696. 

  696. extension, use the <code class="docutils literal"><span class="pre">MB_ENABLED</span></code> constant.</p>
    697. 

  697. </div>
    698. 

  698. </div>
    699. 

  699. <div class="section" id="id4">
    700. 

  700. <h3><a class="toc-backref" href="#id16">Function reference</a><a class="headerlink" href="#id4" title="Permalink to this headline">¶</a></h3>
    701. 

  701. <dl class="function">
    702. 

  702. <dt id="mb_strlen">
    703. 

  703. <code class="descname">mb_strlen</code><span class="sig-paren">(</span><em>$str</em><span class="optional">[</span>, <em>$encoding = NULL</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#mb_strlen" title="Permalink to this definition">¶</a></dt>
    704. 

  704. <dd><table class="docutils field-list" frame="void" rules="none">
    705. 

  705. <col class="field-name" />
    706. 

  706. <col class="field-body" />
    707. 

  707. <tbody valign="top">
    708. 

  708. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    709. 

  709. <li><strong>$str</strong> (<em>string</em>) – Input string</li>
    710. 

  710. <li><strong>$encoding</strong> (<em>string</em>) – Character set</li>
    711. 

  711. </ul>
    712. 

  712. </td>
    713. 

  713. </tr>
    714. 

  714. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Number of characters in the input string or FALSE on failure</p>
    715. 

  715. </td>
    716. 

  716. </tr>
    717. 

  717. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
    718. 

  718. </td>
    719. 

  719. </tr>
    720. 

  720. </tbody>
    721. 

  721. </table>
    722. 

  722. <p>For more information, please refer to the <a class="reference external" href="http://php.net/mb_strlen">PHP manual for
    723. 

  723. mb_strlen()</a>.</p>
    724. 

  724. </dd></dl>
    725. 

  725. 

  726. <dl class="function">
    727. 

  727. <dt id="mb_strpos">
    728. 

  728. <code class="descname">mb_strpos</code><span class="sig-paren">(</span><em>$haystack</em>, <em>$needle</em><span class="optional">[</span>, <em>$offset = 0</em><span class="optional">[</span>, <em>$encoding = NULL</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#mb_strpos" title="Permalink to this definition">¶</a></dt>
    729. 

  729. <dd><table class="docutils field-list" frame="void" rules="none">
    730. 

  730. <col class="field-name" />
    731. 

  731. <col class="field-body" />
    732. 

  732. <tbody valign="top">
    733. 

  733. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    734. 

  734. <li><strong>$haystack</strong> (<em>string</em>) – String to search in</li>
    735. 

  735. <li><strong>$needle</strong> (<em>string</em>) – Part of string to search for</li>
    736. 

  736. <li><strong>$offset</strong> (<em>int</em>) – Search offset</li>
    737. 

  737. <li><strong>$encoding</strong> (<em>string</em>) – Character set</li>
    738. 

  738. </ul>
    739. 

  739. </td>
    740. 

  740. </tr>
    741. 

  741. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Numeric character position of where $needle was found or FALSE if not found</p>
    742. 

  742. </td>
    743. 

  743. </tr>
    744. 

  744. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">mixed</p>
    745. 

  745. </td>
    746. 

  746. </tr>
    747. 

  747. </tbody>
    748. 

  748. </table>
    749. 

  749. <p>For more information, please refer to the <a class="reference external" href="http://php.net/mb_strpos">PHP manual for
    750. 

  750. mb_strpos()</a>.</p>
    751. 

  751. </dd></dl>
    752. 

  752. 

  753. <dl class="function">
    754. 

  754. <dt id="mb_substr">
    755. 

  755. <code class="descname">mb_substr</code><span class="sig-paren">(</span><em>$str</em>, <em>$start</em><span class="optional">[</span>, <em>$length = NULL</em><span class="optional">[</span>, <em>$encoding = NULL</em><span class="optional">]</span><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#mb_substr" title="Permalink to this definition">¶</a></dt>
    756. 

  756. <dd><table class="docutils field-list" frame="void" rules="none">
    757. 

  757. <col class="field-name" />
    758. 

  758. <col class="field-body" />
    759. 

  759. <tbody valign="top">
    760. 

  760. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    761. 

  761. <li><strong>$str</strong> (<em>string</em>) – Input string</li>
    762. 

  762. <li><strong>$start</strong> (<em>int</em>) – Position of first character</li>
    763. 

  763. <li><strong>$length</strong> (<em>int</em>) – Maximum number of characters</li>
    764. 

  764. <li><strong>$encoding</strong> (<em>string</em>) – Character set</li>
    765. 

  765. </ul>
    766. 

  766. </td>
    767. 

  767. </tr>
    768. 

  768. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Portion of $str specified by $start and $length or FALSE on failure</p>
    769. 

  769. </td>
    770. 

  770. </tr>
    771. 

  771. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
    772. 

  772. </td>
    773. 

  773. </tr>
    774. 

  774. </tbody>
    775. 

  775. </table>
    776. 

  776. <p>For more information, please refer to the <a class="reference external" href="http://php.net/mb_substr">PHP manual for
    777. 

  777. mb_substr()</a>.</p>
    778. 

  778. </dd></dl>
    779. 

  779. 

  780. </div>
    781. 

  781. </div>
    782. 

  782. <div class="section" id="standard-functions">
    783. 

  783. <h2><a class="toc-backref" href="#id17">Standard Functions</a><a class="headerlink" href="#standard-functions" title="Permalink to this headline">¶</a></h2>
    784. 

  784. <p>This set of compatibility functions offers support for a few
    785. 

  785. standard functions in PHP that otherwise require a newer PHP version.</p>
    786. 

  786. <div class="section" id="id5">
    787. 

  787. <h3><a class="toc-backref" href="#id18">Dependencies</a><a class="headerlink" href="#id5" title="Permalink to this headline">¶</a></h3>
    788. 

  788. <ul class="simple">
    789. 

  789. <li>None</li>
    790. 

  790. </ul>
    791. 

  791. </div>
    792. 

  792. <div class="section" id="id6">
    793. 

  793. <h3><a class="toc-backref" href="#id19">Function reference</a><a class="headerlink" href="#id6" title="Permalink to this headline">¶</a></h3>
    794. 

  794. <dl class="function">
    795. 

  795. <dt id="array_column">
    796. 

  796. <code class="descname">array_column</code><span class="sig-paren">(</span><em>array $array</em>, <em>$column_key</em><span class="optional">[</span>, <em>$index_key = NULL</em><span class="optional">]</span><span class="sig-paren">)</span><a class="headerlink" href="#array_column" title="Permalink to this definition">¶</a></dt>
    797. 

  797. <dd><table class="docutils field-list" frame="void" rules="none">
    798. 

  798. <col class="field-name" />
    799. 

  799. <col class="field-body" />
    800. 

  800. <tbody valign="top">
    801. 

  801. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    802. 

  802. <li><strong>$array</strong> (<em>array</em>) – Array to fetch results from</li>
    803. 

  803. <li><strong>$column_key</strong> (<em>mixed</em>) – Key of the column to return values from</li>
    804. 

  804. <li><strong>$index_key</strong> (<em>mixed</em>) – Key to use for the returned values</li>
    805. 

  805. </ul>
    806. 

  806. </td>
    807. 

  807. </tr>
    808. 

  808. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">An array of values representing a single column from the input array</p>
    809. 

  809. </td>
    810. 

  810. </tr>
    811. 

  811. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">array</p>
    812. 

  812. </td>
    813. 

  813. </tr>
    814. 

  814. </tbody>
    815. 

  815. </table>
    816. 

  816. <p>For more information, please refer to the <a class="reference external" href="http://php.net/array_column">PHP manual for
    817. 

  817. array_column()</a>.</p>
    818. 

  818. </dd></dl>
    819. 

  819. 

  820. <dl class="function">
    821. 

  821. <dt id="hex2bin">
    822. 

  822. <code class="descname">hex2bin</code><span class="sig-paren">(</span><em>$data</em><span class="sig-paren">)</span><a class="headerlink" href="#hex2bin" title="Permalink to this definition">¶</a></dt>
    823. 

  823. <dd><table class="docutils field-list" frame="void" rules="none">
    824. 

  824. <col class="field-name" />
    825. 

  825. <col class="field-body" />
    826. 

  826. <tbody valign="top">
    827. 

  827. <tr class="field-odd field"><th class="field-name">Parameters:</th><td class="field-body"><ul class="first simple">
    828. 

  828. <li><strong>$data</strong> (<em>array</em>) – Hexadecimal representation of data</li>
    829. 

  829. </ul>
    830. 

  830. </td>
    831. 

  831. </tr>
    832. 

  832. <tr class="field-even field"><th class="field-name">Returns:</th><td class="field-body"><p class="first">Binary representation of the given data</p>
    833. 

  833. </td>
    834. 

  834. </tr>
    835. 

  835. <tr class="field-odd field"><th class="field-name">Return type:</th><td class="field-body"><p class="first last">string</p>
    836. 

  836. </td>
    837. 

  837. </tr>
    838. 

  838. </tbody>
    839. 

  839. </table>
    840. 

  840. <p>For more information, please refer to the <a class="reference external" href="http://php.net/hex2bin">PHP manual for hex2bin()</a>.</p>
    841. 

  841. </dd></dl>
    842. 

  842. 

  843. </div>
    844. 

  844. </div>
    845. 

  845. </div>
    846. 

  846. 

  847. 

  848.           </div>
    849. 

  849.           <footer>
    850. 

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    852. 

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    853. 

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    854. 

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    857. 

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    859. 

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    860. 

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    862. 

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  863.   <div role="contentinfo">
    864. 

  864.     <p>
    865. 

  865.         &copy; Copyright 2014 - 2019, British Columbia Institute of Technology.
    866. 

  866.       Last updated on Sep 19, 2019.
    867. 

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