PHP: uksort() function
PHP: Sort an array by keys using a user-defined comparison function
The uksort() function is used to sort an array by the element keys using a user-defined 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 relative order in the sorted array is undefined.
Version:
(PHP 4 and above)
Syntax:
uksort(array_name, user_defined_function)
Parameters:
| Name | Description | Required / Optional |
Type |
|---|---|---|---|
| array_name | The input array. | Required | Array |
| user_defined_function | User supplied function. | Required | - |
Return value
TRUE on success or FALSE on failure.
Value Type : Boolean.
Example:
<?php
function my_sort($x, $y)
{
if ($x == $y) return 0;
return ($x > $y) ? -1 : 1;
}
$people = array("10" => "javascript",
"20" => "php", "60" => "vbscript",
"40" => "jsp");
uksort($people, "my_sort");
print_r ($people);
?>
Output:
Array ([60] => vbscript [40] => jsp [20] => php [10] => javascript )
Pictorial Presentation:
View the example in the browser
Practice here online:
See also