- https://www.sqreen.com/checklists/php-security-checklist
- https://howtogetonline.com/how-to-harden-your-php-for-better-security.php
- https://www.cyberciti.biz/tips/php-security-best-practices-tutorial.html
- https://www.idontplaydarts.com/2011/02/hardening-and-securing-php-on-linux/
- https://www.cloudways.com/blog/php-security/