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The following table lists the valid array keys for PHPExcel_Style applyFromArray() classes. If the "Maps to property" column maps a key to a setter, the value provided for that key will be applied directly. If the "Maps to property" column maps a key to a getter, the value provided for that key will be applied as another style array.
PHPExcel_Style
Array key | Maps to property
-------------|-------------------
fill | getFill()
font | getFont()
borders | getBorders()
alignment | getAlignment()
numberformat | getNumberFormat()
protection | getProtection()
PHPExcel_Style_Fill
Array key | Maps to property
-----------|-------------------
type | setFillType()
rotation | setRotation()
startcolor | getStartColor()
endcolor | getEndColor()
color | getStartColor()
PHPExcel_Style_Font
Array key | Maps to property
------------|-------------------
name | setName()
bold | setBold()
italic | setItalic()
underline | setUnderline()
strike | setStrikethrough()
color | getColor()
size | setSize()
superScript | setSuperScript()
subScript | setSubScript()
PHPExcel_Style_Borders
Array key | Maps to property
------------------|-------------------
allborders | getLeft(); getRight(); getTop(); getBottom()
left | getLeft()
right | getRight()
top | getTop()
bottom | getBottom()
diagonal | getDiagonal()
vertical | getVertical()
horizontal | getHorizontal()
diagonaldirection | setDiagonalDirection()
outline | setOutline()
PHPExcel_Style_Border
Array key | Maps to property
----------|-------------------
style | setBorderStyle()
color | getColor()
PHPExcel_Style_Alignment
Array key | Maps to property
------------|-------------------
horizontal | setHorizontal()
vertical | setVertical()
rotation | setTextRotation()
wrap | setWrapText()
shrinkToFit | setShrinkToFit()
indent | setIndent()
PHPExcel_Style_NumberFormat
Array key | Maps to property
----------|-------------------
code | setFormatCode()
PHPExcel_Style_Protection
Array key | Maps to property
----------|-------------------
locked | setLocked()
hidden | setHidden()