PHP Tutorial - PHP uasort() Function

Definition

The uasort() function sorts an array by values using a user-defined comparison function.

Syntax

PHP uasort() Function has the following syntax.

uasort(array,myfunction);

Parameter

Parameter	Is Required	Description
array	Required.	Array to sort
myfunction	Optional.	Name of the comparison function.

myfunction 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 values using a user-defined comparison function:


<?php//from  w ww .jav  a2s .c  o m
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");
?>