The Symfony documentation
A collection of samples that demonstrate how to call Google Cloud services from PHP.
SQLI labs to test error based, Blind boolean based, Time based.
PHP Language Specification
Examples of using each Illuminate component in non-Laravel applications
Source files for the 30 days free tutorials challenge as part of the Make Professional 2d Games with Godot Kickstarter
Clean Code concepts adapted for PHP
Learn You PHP! - An introduction to PHP's core features: i/o, http, arrays, exceptions and so on.