Free PHP Debugger & Profiler Extension: Xdebug
Xdebug is a free and open source PHP extension for debugging and profiling PHP scripts in detail.
Considering it is an extension, the usage is easy and requires very few things to setup in the code-side.
It can provide data on stack traces and function traces in error messages with full parameter display for user defined functions, function name, file name and line indications.
Xdebug can also present the memory allocation, profiling information and code coverage analysis.
And, it has an interface (including extensions for browsers) that interact with running PHP scripts for debugger clients.
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