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The interactive PHP debugger

Implemented as a SAPI module, phpdbg can excert complete control over the environment without impacting the functionality or performance of your code.

phpdbg aims to be a lightweight, powerful, easy to use debugging platform for PHP5.4+

Stepthrough Debugging
Flexible Breakpoints (Class Method, Function, File:Line, Address, Opcode)
Easy Access to PHP with built-in eval()
Easy Access to Currently Executing Code
Userland API
SAPI Agnostic - Easily Integrated
PHP Configuration File Support
JIT Super Globals - Set Your Own !!
Optional readline Support - Comfortable Terminal Operation
Remote Debugging Support - Bundled Java GUI
Easy Operation - See Help