## Example

`

     bool usort ( array &$array , callback $cmp_function )

`

## Description

This function will sort an array by its values using a user-supplied comparison function. If the array you wish to sort needs to be sorted by some non-trivial criteria, you should use this function. Note: If two members compare as equal, their order in the sorted array is undefined. Note: This function assigns new keys to the elements in array. It will remove any existing keys that may have been assigned, rather than just reordering the keys.

## Return Values

Returns TRUE on success or FALSE on failure.