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<?php $sizes = array("L", "XXXL", "M", "S", "M"); function compare($a, $b) { $sizeincrement = array("XS", "S", "M", "L", "XL", "XXL", "XXXL"); return array_search($a, $sizeincrement) > array_search($b, $sizeincrement); } usort($sizes, "compare"); print_r($sizes);

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