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

1、$_SERVER["SCRIPT_NAME"]

說明：包含當前腳本的路徑

2、$_SERVER["PHP_SELF"]

說明：當前正在執行腳本的文件名

3、$_SERVER["QUERY_STRING"]

說明：查詢(query)的字符串

4、$_SERVER["REQUEST_URI"]

說明：訪問此頁面所需的URI

實例：

1.http://52php.cnblogs.com/ (直接打開主頁)

結果：

$_SERVER["SCRIPT_NAME"] = "/index.php"
$_SERVER["PHP_SELF"]     = "/index.php"
$_SERVER["QUERY_STRING"] = ""
$_SERVER["REQUEST_URI"] = "/"

2.http://52php.cnblogs.com/?p=222 (附帶查詢)

結果：

$_SERVER["SCRIPT_NAME"] = "/index.php"
$_SERVER["PHP_SELF"]     = "/index.php"
$_SERVER["QUERY_STRING"] = "p=222"
$_SERVER["REQUEST_URI"] = "/?p=222"

3.http://52php.cnblogs.com/index.php?p=222&q=biuuu

結果：

$_SERVER["SCRIPT_NAME"] = "/index.php"
$_SERVER["PHP_SELF"]     = "/index.php"
$_SERVER["QUERY_STRING"] = "p=222&q=biuuu"
$_SERVER["REQUEST_URI"] = "/index.php?p=222&q=biuuu"

4.http://52php.cnblogs.com/123/123.php/abc/def?id=222&name=jack

$_SERVER["SCRIPT_NAME"] = "/123/123.php"
$_SERVER["PHP_SELF"]     = "/123/123.php/abc/def"
$_SERVER["QUERY_STRING"] = "id=222&name=jack"
$_SERVER["REQUEST_URI"] = "/123/123.php/abc/def?id=222&name=jack"

5.http://52php.cnblogs.com/123/123.php/abc/def.bat?id=222&name=jack

$_SERVER["SCRIPT_NAME"] = "/123/123.php"
$_SERVER["PHP_SELF"]     = "/123/123.php/abc/def.bat"
$_SERVER["QUERY_STRING"] = "id=222&name=jack"
$_SERVER["REQUEST_URI"] = "/123/123.php/abc/def.bat?id=222&name=jack"

?

• $_SERVER["SCRIPT_NAME"] ?獲取當前腳本的路徑，如：index.php
• $_SERVER["PHP_SELF"] ?當前正在執行腳本的文件名
• $_SERVER["QUERY_STRING"] ?獲取查詢語句，實例中可知，獲取的是?后面的值
• $_SERVER["REQUEST_URI"] ?獲取http://52php.cnblogs.com后面的值，包括/

總結一下，對于SCRIPT_NAME、PHP_SELF、QUERY_STRING、REQUEST_URI，深入了解將有利于我們 在$_SERVER函數中正確調用這四個值。

一般地：?$_SERVER["REQUEST_URI"] = $_SERVER["PHP_SELF"] . '?' . $_SERVER["QUERY_STRING"]

?

注意：當有地址重寫時，情況有些變化，如：

/class 重寫到 /index.php?app=class&mod=Index&act=index

此時：

$_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系統中處理技巧：

//處理REQUEST_URI
if (!isset($_SERVER['REQUEST_URI'])) {$_SERVER['REQUEST_URI'] = $_SERVER['PHP_SELF'];if (isset($_SERVER['QUERY_STRING'])) $_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
}
if ($_SERVER['REQUEST_URI']) {$temp = urldecode($_SERVER['REQUEST_URI']);if (strexists($temp, '<') || strexists($temp, '"')) {$_GET = shtmlspecialchars($_GET); // XSS}
}

?

?

?

延伸閱讀：

PHP獲取當前頁面的URL

PHP獲取當前域名$_SERVER['HTTP_HOST']和$_SERVER['SERVER_NAME']的區別

PHP的$_SERVER['PHP_SELF']造成的XSS漏洞攻擊及其解決方案