compare two arrays and return the difference php

1
2<?php
3$array1 = array("a" => "green", "red", "blue", "red");
4$array2 = array("b" => "green", "yellow", "red");
5$result = array_diff($array1, $array2);
6
7print_r($result);
8?>
9
10Array
11(
12    [1] => blue
13)

1array_merge(array_diff($array1,$array2),array_diff($array2,$array1))
2