JFIFxxC      C  " }!1AQa"q2#BR$3br %&'()*456789:CDEFGHIJSTUVWXYZcdefghijstuvwxyz w!1AQaq"2B #3Rbrean(); } public function ean8(): string { return $this->ean(8); } public function isbn10(): string { $code = Extension\Helper::numerify(str_repeat('#', 9)); return sprintf('%s%s', $code, Calculator\Isbn::checksum($code)); } public function isbn13(): string { $code = '97' . mt_rand(8, 9) . Extension\Helper::numerify(str_repeat('#', 9)); return sprintf('%s%s', $code, Calculator\Ean::checksum($code)); } }