How to use php usort function

How to use php usort() function

php usort() function definition and usage

usort() usage User-defined comparison function sorts arrays.

Syntax

usort(array,myfunction);

Parameters

array required. Specifies the array to be sorted.

myfunction Optional. A string that defines a callable comparison function. If the first argument is <, =, > and the second argument is, the corresponding comparison function must return an integer of <, =, > 0.

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");
?>

Output:

2
4
6
8

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