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PHP array_udiff() Function

PHP array_udiff() Function

Hello folks! welcome back to a new section of our tutorial on PHP. In this tutorial guide, we are going to be studying about the PHP array_udiff() Function.

The PHP array_udiff() function computes the difference of arrays using a callback function for data comparison 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( $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;
   $array1 = array("a"=>"orange","b"=>"mango","c"=>"banana");
   $array2 = array("a"=>"orange","b"=>"mango","c"=>"apple");


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

Array ( [c] => banana )	

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

Feel free to ask your questions where necessary and we will attend to them as soon as possible. If this tutorial was helpful to you, you can use the share button to share this tutorial.

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