Syntax:array array_diff_key ( array $array1 , array $array2 [, array $… ] )Description:Computes the difference of arrays using keys for comparison<?php $array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4); $array2 = array('green' => 5, 'blue' => 6, 'yellow' => 7, 'cyan' => 8); print_r(array_diff_key($array1, $array2)); ?>OUTPUTArray ( [red] => 2 [purple] => 4 )... Read More »