xdebug是一个开放源代码的PHP程序调试器(即一个Debug工具)，可以用来跟踪，调试和分析PHP程序的运行状况。
xdebug现在的最新版本是xdebug 2.0.3，支持PHP4/PHP5。
xdebug现在的最新版本是xdebug 2.0.3，支持PHP4/PHP5。
官方站点：www.xdebug.org
官方站点上对xdebug的介绍：
The Xdebug extension helps you debugging your script by providing a lot of valuable debug information. The debug information that Xdebug can provide includes the following:
官方站点上对xdebug的介绍：
The Xdebug extension helps you debugging your script by providing a lot of valuable debug information. The debug information that Xdebug can provide includes the following:
- stack traces and function traces in error messages with:
- full parameter display for user defined functions
- function name, file name and line indications
- support for member functions
- memory allocation
- protection for infinite recursions
Xdebug also provides:
- profiling information for PHP scripts
- code coverage analysis
- capabilities to debug your scripts interactively with a debug client
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