Use a user-defined comparison function to sort the elements in the array $arr by key name:
<?phpfunction my_sort($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");?>The uksort() function sorts an array by key name using a user-defined comparison function.
Tip: Please use the uasort() function to sort the array by key value, which uses a user-defined comparison function to sort.
uksort( array,myfunction );
| parameter | describe |
|---|---|
| array | Required. Specifies the array to be sorted. |
| myfunction | Optional. A string that defines a callable comparison function. If the first parameter <, =, > the second parameter, the corresponding comparison function must return an integer <, =, > 0. |
| Return value: | Returns TRUE if successful and FALSE if failed. |
|---|---|
| PHP version: | 4+ |