In this article, you will learn how to sort an array using its keys based on some user-defined function. The uksort() function takes keys from the array and passes them to the user-defined function and sorts them according to it.
What is the syntax of the uksort() function in PHP?
uksort(array, myfunction)
| Parameter | Details |
|---|---|
| array | The array to sort – Required |
| my_function | Callable function name (string). The callable function compares two values and returns an integer <, =, or > 0 if the first value is <, = or > than second. |
Examples of uksort() function
Example 1. Sort the array elements by keys using the user-defined function that compares keys.
<?php
function my_function($x,$y)
{
if ($x==$y) return 0;
return ($x<$y)?-1:1;
}
$arr=array("alpha"=>1,"beta"=>3,"gama"=>8,"delta"=>0);
uksort($arr,"my_function");
?>
