PHP array_udiff_assoc() Function

Hello dear readers! welcome back to another section of our tutorial on PHP. In this tutorial, we will be studying about the PHP Function array_udiff_assoc().

PHP built-in array_udiff_assoc() function computes the difference of arrays with additional index check, compares data by a callback function and returns an array containing all of the values from array1 that are not present in any of the other arguments.


Following below is the syntax to use this function -

array_udiff_assoc ( $array1, $array2 [, $array3 ..., $data_compare_func] );

Parameter Details

Sr.NoParameter & Description


It specifies an array.



It specifies an array to be compared with the first array.



It specifies an array to be compared with the first array.



The name of the user-made function.

Return Value

It returns an array containing all the values from array1 that are not present in the other arguments.


Try out the below example -

   function call_back_function($v1,$v2) {
      if ($v1 === $v2) {
         return 0;
      return 1;
   $input = array("a"=>"orange","b"=>"orange","c"=>"mango");
   $input1 = array("a"=>"orange","b"=>"mango","c"=>"orange");


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

Array ( [b] => orange [c] => mango )

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 array_udiff_uassoc() Function in PHP.

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