PHP_CodeSniffer : PHP_CodeSniffer tokenises PHP, JavaScript and CSS files and detects violations of a defined set of coding standards.
FireLogger : A sexy server logger console in Firebug
Mink : Mink is an open source acceptance test framework for web applications, written in PHP 5.3.
PsySH : A runtime developer console, interactive debugger and REPL for PHP. PsySH can be used as an interactive debugger, much like JavaScript's debugger sta...
Webhook Tester : Webhook Tester allows you to easily test webhooks and other types of HTTP requests.
A tool for quickly profiling variables and resources used by PHP.
