ひとまず動作
https://memo.silverpigeon.jp/jan13/
See
- http://php.birdlab.com/demo/practice/barcode/jan/
- https://github.com/dompdf/dompdf/
- https://jpn.itlibra.com/article?id=20882
- https://s8a.jp/php-security-1
- https://s8a.jp/php-security-2
- https://developers.google.com/recaptcha/