PHP | uasort() Function

PHP uasort() Function

Hello dear readers! welcome back to another edition of our tutorial on PHP. In this tutorial guide, we are going to be discussing about the PHP uasort() Function.

The PHP uasort() function sorts an array such that array indices maintain their correlation with the array elements that they are associated with. This is generally used when sorting the associative arrays where the actual element sequence is important.


Following below is the syntax to use this function -

uasort ( $array, $cmp_function )

Parameter Details

Sr.NoParameter & Description


It specifies an array.



Use if defined function to compare values and to sort them.

The function must return -1, 0, or 1 for this method to work correctly. It should be written to accept two parameters to compare, and it should work something like this −

  • If a = b, return 0
  • If a > b, return 1
  • If a < b, return -1

Return Value

This PHP function returns TRUE on success, or FALSE on failure.


Try out the below example -

   function cmp_function($a, $b) {
      if ($a == $b) return 0;
      return ($a > $b) ? -1 : 1;
   $input = array("d"=>"lemon", "a"=>"orange", "b"=>"banana" );
   uasort($input, "cmp_function");


When the above code is executed, it will produce the following result -

Array ( [a] => orange [d] => lemon [b] => banana )

Alright guys! This is where we are rounding up for this tutorial post. In our next tutorial guide, we are going to be discussing about the PHP uksort() Function.

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