APDIntroduction
APD is the Advanced PHP Debugger. It was written to provide profiling and debugging capabilities for PHP code, as well as to provide the ability to print out a full stack backtrace. APD supports interactive debugging, but by default it writes data to trace files. It also offers event based logging so that varying levels of information (including function calls, arguments passed, timings, etc.) can be turned on or off for individual scripts.
Caution
APD is a Zend Extension, modifying the way the internals of PHP handle function calls, and thus may or may not be compatible with other Zend Extensions (for example Zend Optimizer).
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