php代码运行流程_运行php需要的环境

php代码运行流程_运行php需要的环境 PHP执行这段代码会经过如下4个步骤(确切的来说，应该是PHP的语言引擎Zend)1.Scanning(Lexing) ,将PHP代码转换为语言片段(Tokens)2.Parsing, 将Tokens转换成简单而有意义的表达式3.Compilation, 将表达式编译成Opocdes4.Execution, 顺次执行Opcodes，每次一条，从而实现PHP脚本的功能。

token_get_all()将一段PHP代码 Scanning成Tokens；var_dump(token_get_all(‘<?php echo “Hello World”; ?>’));Array([0] => Array([0] => 376[1] => <?php[2] => 1 )[1] => Array([0] => 319[1] => echo[2] => 1 )[2] => Array([0] => 379[1] =>[2] => 1 )[3] => Array([0] => 318[1] => “Hello World”[2] => 1 )[4] => ;[5] => Array([0] => 379[1] =>[2] => 1 )[6] => Array([0] => 378[1] => ?>[2] => 1 ))