PHP $_SERVER["SCRIPT_NAME"]、$_SERVER["PHP_SELF"]、$_SERVER["QUERY_STRING"]、$_SERVER["REQUEST_URI"]

1、$_SERVER["SCRIPT_NAME"]
说明：包含当前脚本的路径
2、$_SERVER["PHP_SELF"]
说明：当前正在执行脚本的文件名
3、$_SERVER["QUERY_STRING"]
说明：查询(query)的字符串
4、$_SERVER["REQUEST_URI"]
说明：访问此页面所需的URI
实例：
1.http://blog.snsgou.com/ (直接打开主页)
结果：
1
$_SERVER["SCRIPT_NAME"] = "/index.php"
2
$_SERVER["PHP_SELF"]     = "/index.php"
3
$_SERVER["QUERY_STRING"] = ""
4
$_SERVER["REQUEST_URI"] = "/"
2.http://blog.snsgou.com/?p=222 (附带查询)
结果：
1
$_SERVER["SCRIPT_NAME"] = "/index.php"
2
$_SERVER["PHP_SELF"]     = "/index.php"
3
$_SERVER["QUERY_STRING"] = "p=222"
4
$_SERVER["REQUEST_URI"] = "/?p=222"
3.http://blog.snsgou.com/index.php?p=222&q=biuuu
结果：
1
$_SERVER["SCRIPT_NAME"] = "/index.php"
2
$_SERVER["PHP_SELF"]     = "/index.php"
3
$_SERVER["QUERY_STRING"] = "p=222&q=biuuu"
4
$_SERVER["REQUEST_URI"] = "/index.php?p=222&q=biuuu"
4.http://blog.snsgou.com/123/123.php/abc/def?id=222&name=jack
1
$_SERVER["SCRIPT_NAME"] = "/123/123.php"
2
$_SERVER["PHP_SELF"]     = "/123/123.php/abc/def"
3
$_SERVER["QUERY_STRING"] = "id=222&name=jack"
4
$_SERVER["REQUEST_URI"] = "/123/123.php/abc/def?id=222&name=jack"
5.http://blog.snsgou.com/123/123.php/abc/def.bat?id=222&name=jack
1
$_SERVER["SCRIPT_NAME"] = "/123/123.php"
2
$_SERVER["PHP_SELF"]     = "/123/123.php/abc/def.bat"
3
$_SERVER["QUERY_STRING"] = "id=222&name=jack"
4
$_SERVER["REQUEST_URI"] = "/123/123.php/abc/def.bat?id=222&name=jack"

$_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
$_SERVER["QUERY_STRING"]  获取查询语句，实例中可知，获取的是?后面的值
$_SERVER["REQUEST_URI"]  获取http://blog.snsgou.com后面的值，包括/
总结一下，对于SCRIPT_NAME、PHP_SELF、QUERY_STRING、REQUEST_URI，深入了解将有利于我们 在$_SERVER函数中正确调用这四个值。
一般地： $_SERVER["REQUEST_URI"] = $_SERVER["PHP_SELF"] . '?' . $_SERVER["QUERY_STRING"]

注意：当有地址重写时，情况有些变化，如：
/class 重写到 /index.php?app=class&mod=Index&act=index
此时：
$_SERVER['PHP_SELF'] 值等于 /index.php
$_SERVER['QUERY_STRING'] 值等于 /index.php?app=class&mod=Index&act=index
$_SERVER["REQUEST_URI"] 值等于 /class

uchome系统中处理技巧：
01
//处理REQUEST_URI
02
if (!isset($_SERVER['REQUEST_URI'])) {
03
$_SERVER['REQUEST_URI'] = $_SERVER['PHP_SELF'];
04
if (isset($_SERVER['QUERY_STRING'])) $_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
05
}
06
if ($_SERVER['REQUEST_URI']) {
07
$temp = urldecode($_SERVER['REQUEST_URI']);
08
if (strexists($temp, '<') || strexists($temp, '"')) {
09
$_GET = shtmlspecialchars($_GET); // XSS
10
}
11
}

转载地址：http://www.php-note.com/article/detail/157