Definition and Usage
The uksort() function sorts an array by keys using a user-defined comparison function.Tip: Use the uasort() function to sort an array by values using a user-defined comparison function.
Syntax
uksort(array,function);
| 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
Sort the elements of the $arr array by keys using a user-defined comparison function:
<?php
function my_sort($a,$b)
{
if ($a==$b) return 0;
return ($a<$b)?-1:1;
}
$arr=array("a"=>4,"b"=>2,"c"=>8,d=>"6");
uksort($arr,"my_sort");
?>
function my_sort($a,$b)
{
if ($a==$b) return 0;
return ($a<$b)?-1:1;
}
$arr=array("a"=>4,"b"=>2,"c"=>8,d=>"6");
uksort($arr,"my_sort");
?>
OUTPUT :
Key=a, Value=4
Key=b, Value=2
Key=c, Value=8
Key=d, Value=6
Key=b, Value=2
Key=c, Value=8
Key=d, Value=6