Definition
The uksort() function sorts an array by keys using a user-defined comparison function.
Syntax
uksort(array, function)
Parameters
| Parameter | Description |
|---|---|
array |
Required. Specifies the array to sort. |
function |
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. |
Example
<?php
function compare($x, $y) {
if($x == $y){
return 0;
}
return ($x < $y) ? -1 : 1;
}
$array = array("a" => 3, "b" => 1, "c" => 8, "d" => -1, "e" => 7, "f" => -9);
uksort($array, "compare");
print_r($array);