详解 $_SERVER 函数中QUERY_STRING和REQUEST_URI区别

实例：

1，http://localhost/aaa/(打开aaa中的index.php)

结果：

$_SERVER['QUERY_STRING'] = "";

$_SERVER['REQUEST_URI']= "/aaa/";

$_SERVER['SCRIPT_NAME']= "/aaa/index.php";

$_SERVER['PHP_SELF']= "/aaa/index.php";

2，http://localhost/aaa/?p=222(附带查询)

结果：

$_SERVER['QUERY_STRING'] = "p=222";

$_SERVER['REQUEST_URI']= "/aaa/?p=222";

$_SERVER['SCRIPT_NAME']= "/aaa/index.php";

$_SERVER['PHP_SELF']= "/aaa/index.php";

3，http://localhost/aaa/index.php?p=222&q=333

结果：

$_SERVER['QUERY_STRING'] = "p=222&q=333";

$_SERVER['REQUEST_URI']= "/aaa/index.php?p=222&q=333";

$_SERVER['SCRIPT_NAME']= "/aaa/index.php";

$_SERVER['PHP_SELF']= "/aaa/index.php";

由实例可知：

$_SERVER["QUERY_STRING"]获取查询 语句，实例中可知，获取的是?后面的值

$_SERVER["REQUEST_URI"]获取 http://localhost 后面的值，包括/

$_SERVER["SCRIPT_NAME"]获取当前脚本的路径，如：index.php

$_SERVER["PHP_SELF"]当前正在执行脚本的文件名