- var_dump: documentation ( source)
- array_diff: documentation ( source)
<?php
$array_a = array(0,15,25);
$array_b = array(0,15,25,32);
$array_c = array(0,7,25);
var_dump(array_diff($array_a,$array_b));
var_dump(array_diff($array_b,$array_a));
var_dump(array_diff($array_a,$array_c));