private static function imageNull() { if (is_array(self::$_img_data) && count(self::$_img_data) == 0) { self::$_errno = SAE_ErrParameter; self::$_errmsg = "image data cannot be empty"; return true; } if (!is_array(self::$_img_data) && self::$_img_data == "") { self::$_errno = SAE_ErrParameter; self::$_errmsg = "image data cannot be empty"; return true; } return false; }