PHP - Function array_diff_uassoc()


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Syntax

array_diff_uassoc ( $array1, $array2 [, $array3..., callback $key_compare_func] );

Definition and Usage

It compares array1 against array2 and returns the difference. Unlike array_diff() the array keys are used in the comparison.

Parameters

Sr.No Parameter & Description
1

array1(Required)

The array to compare from

2

array2(Required)

This is an array to be compared with the first array

3

array3(Optional)

An array to be compared with the first array

4

key_compare_func(Required)

It is a callback function to use.

Return Values

It returns an array containing all the entries from array1 that are not present in any of the other arrays.

Example

Try out following example −

<?php
   function key_compare_func($a, $b) {
      if ($a === $b) {
         return 0;
      }
      return ($a > $b)? 1:-1;
   }
	
   $input1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");
   $input2 = array("a" => "green", "yellow", "red");
   
   $result = array_diff_uassoc($input1, $input2, "key_compare_func");
   
   print_r($result);

?> 

This will produce the following result −

Array ( [b] => brown [c] => blue [0] => red )

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