PHP静态变量

Question

1. 什么是静态变量？
   

2. 静态变量的作用是什么？

Answer 1

php的静态变量是在函数内部定义的，它跟一般的动态变量不一样，动态变量的生命周期是在函数执行结束就被系统回收了，而静态变量的生命周期是在脚本结束才回收，静态变量在函数第一次调用时初始化，以后再次调用函数不会再进行初始化，静态变量的作用一般用于在函数内部进行统计，在定义无限级分类函数的时候用得到（我自己写过）。

Answer 2

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