PHP执行过程
任何一种语言的源代码计算机都没有办法直接执行,需要转换成计算机能够识别的机器指令。
PHP编程语言也是一门高级语言,也需编译(解释)
PHP的解析过程:
1、请求源代码,进行词法解析,语法解析。
词法解析,主要对源代码中的单词进行一个个的读入,判断,词法解析时,如果有错误,会报错。编译错误。
语法解析,主要判断语法结构是否正确。比如:流程控制结构是否完成。
结果:是可执行的机器代码
2、执行,执行时主要是对内存的操作,执行时也可能会出现错误,此时错误属性执行错误。
结果:纯的html代码。
图解:

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