uasort

Definition and usage

uasort() function uses a user-defined comparison function to sort the array and keep index related (no new keys assigned to elements).

Return TRUE if successful, otherwise return FALSE.

This function is mainly used to sort those combined arrays whose unit order is important.

Tip: Please use the uksort() function to sort the array key names through the user-defined comparison function.

Example

Use a user-defined comparison function to sort elements in the array $arr by key value:

 <?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" ) ;
uasort ( $arr , "my_sort" ) ;
?>

Try it yourself

grammar

 uasort ( array , myfunction ) ;