Open source and free e-book, that collects collects more than 50 useful, unknown, underrated PHP functions or stuff discovered, used, and learned during PHP's daily use.
Review of content, thanks to the support of @whoami15
This book is released as open source. If you find a typo or generally any aspect that needs improvement or correction, feel free to create an issue, or you can open a Pull Request.
Fix license and fonts
Thanks to @kingkool68 for the review for typos, grammar and clarifications.
First release