regex101 : Free PCRE-based regular expression debugger with real time explanation, error detection and highlighting.
SitePoint : SitePoint provides cutting-edge content for web professionals — developers, designers, programmers, freelancers and site owners.
Pro Git : The entire Pro Git book, written by Scott Chacon and published by Apress, is available here
Noun Project : The Noun Project is a website that aggregates and catalogs symbols that are created and uploaded by graphic designers around the world. Based in Los A...
DesignPatternsPHP : This is a collection of known design patterns and some sample code how to implement them in PHP. Every pattern has a small list of examples (most of t...
