Computes the intersection of arrays, compares data by a callback function array_uintersect_uassoc array_unique Array Functions PHP Manual array_uintersect (PHP 5)array_uintersect — Computes the intersection of arrays, compares data by a callback function Description array array_uintersect ( array $array1 , array $array2 [, array $ ... ], callback $data_compare_func ) Computes the intersection of arrays, compares data by a callback function. Parameters array1 The first array. array2 The second array. data_compare_func The callback comparison function. The user supplied callback function is used for comparison. It must return an integer less than, equal to, or greater than zero if the first argument is considered to be respectively less than, equal to, or greater than the second. Return Values Returns an array containing all the values of array1 that are present in all the arguments. Examples Example #1 array_uintersect() example <?php$array1 = array("a" => "green", "b" => "brown", "c" => "blue", "red");$array2 = array("a" => "GREEN", "B" => "brown", "yellow", "red");print_r(array_uintersect($array1, $array2, "strcasecmp"));?> The above example will output: Array ( [a] => green [b] => brown [0] => red ) See Also array_intersect() array_intersect_assoc() array_uintersect_assoc() array_uintersect_uassoc() array_uintersect_uassoc array_unique Array Functions PHP Manual