PHP - Function array_diff_key()


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Syntax

array array_diff_key ( array $array1, array $array2 [, array $...] );

Definition and Usage

Compares array1 against array2 and returns the difference.

Parameters

Sr.No Parameter & Description
1

array1

Required. The first array is the array that the others will be compared with.

2

array2

Required. An array to be compared with the first array

3

array3

Optional. An array to be compared with the first array

Return Values

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
   $a1 = array("a"=>"red","b"=>"green","c"=>"blue","d"=>"yellow");
   $a2 = array("e"=>"red","f"=>"green","g"=>"blue");
   
   $result = array_diff($a1,$a2);
   print_r($result);
?>

This will produce the following result −

Array ( [d] => yellow )

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