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); $in_filter = array(1, 3, 5); echo join(' ', array_diff($a, $in_filter));
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