- array_intersect: documentation ( source)
- array_diff: documentation ( source)
- join: documentation ( source)
51<?php
$a = array(1, 2, 3, 4, 5, 6);
$in_filter = array(2, 4, 6);
echo join(' ', array_intersect($a, $in_filter));
$a = array(1, 2, 3, 4, 5, 6);
$in_filter = array(1, 3, );
echo join(' ', array_diff($a, $in_filter));