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
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