private static function set_img() { self::$res_img = imagecreatetruecolor(self::$width, self::$height); $color_bg = imagecolorallocate(self::$res_img, 255, 255, 255); //填充图片 imagefilledrectangle(self::$res_img, 0, self::$height, self::$width, 0, $color_bg); }