Sort clothes and shoes sizes

  /**
     * @param mixed $a
     * @param mixed $b
     *
     * @return int
     */
    protected function _sortSizes($a, $b)
    {
        $aUpper = strtoupper($a);
        $bUpper = strtoupper($b);

        $sizes = array(
            'XXXS',
            'XXXS/XXS',
            'XXS/XXXS',
            'XXS',
            'XXS/XS',
            'XS/XXS',
            'XS',
            'XS/S',
            'S/SX',
            'S',
            'S/M',
            'M/S',
            'M',
            'M/L',
            'L/M',
            'L',
            'XL/L',
            'L/XL',
            'XL',
            'XL/XXL',
            'XXL/XL',
            'XXL',
            'XXXL/XXL',
            'XXL/XXXL',
            'XXXL',
        );

        $asize = 100;
        $apos  = -1;
        $bsize = 100;
        $bpos  = -1;
        foreach ($sizes as $val => $str) {
            $pos = ($aUpper == $str) ? 1 : -1;
            if ($pos > 0 && ($apos < 0 || $pos < $apos)) {
                $asize = $val;
                $apos  = $pos;
            }
            $pos = ($bUpper == $str) ? 1 : -1;
            if ($pos > 0 && ($bpos < 0 || $pos < $bpos)) {
                $bsize = $val;
                $bpos  = $pos;
            }
        }
        if ($apos < 0) {
            if (is_numeric($a) && is_numeric($b)) {
                return ($a == $b) ? 0 : ($a > $b) ? 1 : -1;
            } else {
                return (is_numeric($a)) ? -1 : 1;
            }
        }
        if ($bpos < 0) {
            if (is_numeric($a) && is_numeric($b)) {
                return ($a == $b) ? 0 : ($a > $b) ? 1 : -1;
            } else {
                return (is_numeric($b)) ? 1 : -1;
            }
        }

        return ($asize == $bsize ? 0 : ($asize > $bsize ? 1 : -1));
    }

    /**
     * @param array $array
     *
     * @return array
     */
    public function sortSizes(array $array)
    {
        usort(
            $array,
            array(
                $this,
                '_sortSizes',
            )
        );
        return $array;
    }