PHP程序性能剖析（使用 xdebug 和 webgrind）
PHP 程序上线前我们一般需要做一个性能剖析，看看程序花费的时间到底在哪里。一个最简单的方法是使用 XDebug 的 profile 功能。XDebug 可以配置对相应PHP程序执行输出 cachegrind 格式的文件，我们之后用 分析软件去分析这个输出文件，就可以看到性能的结果了。
首先：配置 XDebug
zend_extension=/usr/lib/php5/20090626+lfs/xdebug.so xdebug.profiler_enable=0 ## 使用这个选项，我们只在需要做剖析的时间才激发这个剖析操作， ## 使用方法 http://localhost/workspace/article.sitetuan/?XDEBUG_PROFILE xdebug.profiler_enable_trigger=1 ## 剖析文件放到 /tmp 目录下 xdebug.profiler_output_dir="/tmp/xdebug.profile/"
然后下载 webgrind 程序（Google 自己搜索），直接接压缩到 apache 的目录下，一般是 /var/www 目录
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