Compare the keys of two arrays, and return the differences in PHP

Description

The following code shows how to compare the keys of two arrays, and return the differences.

Example

/*from  w ww.j  a va 2s  . c o  m*/
<?php
   $a1=array("a"=>"red","b"=>"green","c"=>"CSS");
   $a2=array("a"=>"red","c"=>"blue","d"=>"pink");

   $result=array_diff_key($a1,$a2);
   print_r($result);
?>

The code above generates the following result.