public static function parseSize($size)
    {
        $height = null;
        $width = null;

        if (count((array) $size) == 2 || strpos($size, 'x')) {
            list($width, $height) = is_array($size) ? $size : explode('x', $size);
        } else {
            $size = (array) $size;
            $width = (int) $size[0];
        }

        return array($width,$height);
    }