<?php $sizes = array("BAR", "L", "XXXL", "INVALID", "M", "S", "FOO"); function compare($a, $b) { list($a, $b) = array_keys(array("XS", "S", "M", "L", "XL", "XXL", "XXXL"), array($a, $b)); if($a == FALSE || $b == FALSE) return $a < $b; return $a > $b; } usort($sizes, "compare"); print_r($sizes);
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