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uasort

Sort an array with a user-defined comparison function and maintain index association (PHP 4, PHP 5)
bool uasort ( array &array, callback cmp_function )

This function sorts an array such that array indices maintain their correlation with the array elements they are associated with. This is used mainly when sorting associative arrays where the actual element order is significant. The comparison function is user-defined.

Returns TRUE on success or FALSE on failure.

Note:

Please see usort() and uksort() for examples of user-defined comparison functions.

See also usort(), uksort(), sort(), asort(), arsort(), ksort(), and rsort().