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PHP array_multisort() Function
Definition and Usage
The array_multisort() function returns a sorted array. You can assign one or more arrays. The function sorts the first array, and the other arrays follow, then, if two or more values are the same, it sorts the next array, and so on.

he array_multisort() is an inbuilt function in PHP which is used to sort multiple arrays at once or a multi-dimensional array with each individual dimension.
With this function, one should remember that string keys will be maintained, but numeric keys will be re-indexed, starting at 0 and increases by 1.

Note: String keys will be maintained, but numeric keys will be re-indexed, starting at 0 and increase by 1.

Note: You can assign the sortorder and the sorttype parameters after each array. If not specified, each array parameter uses the default values.
Syntax
array_multisort(array1, sortorder, sorttype, array2, array3, ...)
Parameter Values
Parameter Description
array1 Required. Specifies an array
sortorder Optional. Specifies the sorting order. Possible values:

SORT_ASC - Default. Sort in ascending order (A-Z)
SORT_DESC - Sort in descending order (Z-A)

sorttype Optional. Specifies the type to use, when comparing elements. Possible values:

SORT_REGULAR - Default. Compare elements normally (Standard ASCII)
SORT_NUMERIC - Compare elements as numeric values
SORT_STRING - Compare elements as string values
SORT_LOCALE_STRING - Compare elements as string, based on the current locale (can be changed using setlocale())
SORT_NATURAL - Compare elements as strings using "natural ordering" like natsort()
SORT_FLAG_CASE - Can be combined (bitwise OR) with SORT_STRING or SORT_NATURAL to sort strings case-insensitively

array2 Optional. Specifies an array
array3 Optional. Specifies an array
Technical Details
Return Value: Returns TRUE on success or FALSE on failure
PHP Version: 4+
PHP Changelog: PHP 5.4: Added sorting type SORT_NATURAL and SORT_FLAG_CASE
PHP 5.3: Added sorting type SORT_LOCALE_STRING