php如何查看变量的定义顺序
在脚本运行的时候，框架比较复杂，设计很多的文件，有没有什么扩展或者工具能够查看每个变量定义的顺序和定义的位置呢？
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在脚本运行的时候，框架比较复杂，设计很多的文件，有没有什么扩展或者工具能够查看每个变量定义的顺序和定义的位置呢？
xhprof —— facebook 开发的一个测试php性能的扩展。跟Xdebug类似,但性能开销更低
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