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DBG 6.2.8 released (the most recent commercial version)

• All php versions from 4.3 up to 5.5 are fully supported
• Significant performance imrovement
• SQL profiler
• Support for namespaces in expressions, contional and global breakpoints
• Support for multiple parallel debug sessions in one IDE
• Improved call-stack information
• Improved diagnostic for errors and potential problems
• Pre-compiled modules for all major OSes like Linux (x86, x64 and ARM), Windows, FreeBSD, Solaris, OSX and so forth

DBG 2.15.5 (the most recent free version)

• All php versions from 4.3 up to 5.2 are supported
• Improved performance
• Fixed minor bugs related to callstack and evaluate functions
• Fixed problem with profiler denominator
• Fixed minor problems in DbgListener under Vista
• Pre-compiled binaries for Win32 and Linux
• Debugger console (dbg-cli) for Linux/Unix
• Source code

DBG | PHP Debugger and Profiler.

General features.

• native debugger. Works transparently, neither script nor PHP engine modifications required.
• server part (dbg module) runs on all platforms where PHP itself runs.
• works transparently across the global network as well as locally.
• JIT. When enabled it can start debugging Just In Time when an error happens.
• supports back-trace, e.g. displays a list of all procedures with their local variables, the current execution position reached from. In other words you can watch local variables or function parameters in all active and nested scopes.
• certainly, you can execute script in the debugger step by step (step-in, step-out, step-over, run to cursor, change execution point withing current scope...), evaluate any valid php expression(s) or inspect arrays, classes and simple variables, modify their values on the fly and even create any new variables. Dbg supports conditional breakpoints and even global ones (commercial version only). Breakpoints can be skipped specified number of times.
• allows to change execution point (commercial version only).
• has embedded profiler, so now it's easy to find out a bottleneck in the scripts.
• allows multiple debugger processes running simultaneously.
• compatible with php-4.0.6 and higher (commercial is compatible with php 4.3 and higher).
• has open COM interfaces for integration with win32-based 3rd party IDEs.
• Commercial version of DBG (3.x) is available with commercial version of PhpED PHP IDE  only, see review for details.
  Linux, BSD, SunOs, MacOs and Win32 platoforms are supported.
  Free version (2.15) is available on this site. It works with PHP Edit, PHP Coder and some other IDEs.
• Free dbg front-end (dbg-cli) for Linux/Unix can be used to debug scripts either directly or under DDD 3.3.9 (GNU debugger). Also see RedHat 7.3, YellowDog and Mandrake distributions at RPM Find site.
• See screenshots here.

Version comparison.

Feature	Free version (2.15)	Commercial version (6.2)
Basic debugger functionality: steping breakpoints conditional breakpoints watches call-stack error tracing
Advanced debugger features: just-in-time debugging profiler global breakpoints change execution point SQL profiler
Securiry: ip & port based security ssl protocol
Misc: support availability pre-compiled binaries	dd.cron.ru site Linux, Windows	bundled with NuSphere PhpED. Linux, Windows, FreeBSD, Solaris/x86, Solaris/Sparc, Mac OSX/x86, Mac OSX/PowerPC, NetBSD, OpenBSD.

History

Previous releases are listed there