Syntax:array array_diff_ukey ( array $array1 , array $array2 [, array $ … ], callable $key_compare_func )Description:Computes the difference of arrays using a callback function on the keys for comparison<?php function key_compare_func($key1, $key2) { if ($key1 == $key2) return 0; else if ($key1 > $key2) return 1; else return -1; } $array1 = array('blue' => 1, 'red' => 2, 'green' => 3, 'purple' => 4); $array2 = array('green' => 5, 'blue' […]... Read More »