PHP usort() Function
Example
Sort the elements of the $a array using a user-defined comparison function:
<?php
function my_sort($a,$b)
{
if ($a==$b) return 0;
return ($a<$b)?-1:1;
}
$a=array(4,2,8,6);
usort($a,"my_sort");
?>
Try it Yourself »
Definition and Usage
The usort() function sorts an array using a user-defined comparison function.
Syntax
usort(array, myfunction)
Parameter Values
| Parameter | Description |
|---|---|
| array | Required. Specifies the array to sort |
| myfunction | Optional. A string that define a callable comparison function. The comparison function must return an integer <, =, or > than 0 if the first argument is <, =, or > than the second argument |
Technical Details
| Return Value: | TRUE on success. FALSE on failure |
|---|---|
| PHP Version: | 4+ |
❮ PHP Array Reference
