SQL Injection Cheat Sheet : Samples are provided to allow reader to get basic idea of a potential SQL Injection attack and almost every section includes a brief information about...
regex101 : Free PCRE-based regular expression debugger with real time explanation, error detection and highlighting.
When can I use... : Compatibility tables for support of HTML5, CSS3, SVG and more in desktop and mobile browsers.
Browsershot : This PHP package can convert a webpage to an image or pdf. The conversion is done behind the scenes by Puppeteer which controls a headless version of ...
Rocketeer : The fast deployer for modern applications
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 them from Zend Framework, Symfony2 or Doctrine2 as I'm most familiar with this software).