$_SERVER

$HTTP_SERVER_VARS [削除]

(PHP 4 >= 4.1.0, PHP 5)

$_SERVER -- $HTTP_SERVER_VARS [削除]サーバー情報および実行時の環境情報

説明

$_SERVER は、ヘッダ、パス、スクリプトの位置のような 情報を有する配列です。この配列のエントリは、Web サーバーにより 生成されます。全ての Web サーバーがこれら全てを提供する保障はありません。 サーバーは、これらのいくつかを省略したり、この一覧にない他のものを 定義する可能性があります。これらの変数の多くは、 » CGI/1.1 specification で定義されています。したがって、これらについては定義されていることを 期待することができます。

$HTTP_SERVER_VARS の最初の情報は同じですが、 これはスーパーグローバルではありません (HTTP_SERVER_VARS$_SERVER は異なる変数であり、 PHP は異なる変数として処理を行うことに注意してください)。 また、PHP 5.4.0 以降は長い形式の配列が削除されました。 そのため、$HTTP_SERVER_VARS は使えません。

インデックス

以下の各要素のいくつかは $_SERVER に現れない可能性があります。PHP をコマンドラインで実行している場合には、 使用できるものは僅かであることに注意してください。

'PHP_SELF'
現在実行しているスクリプトのファイル名です。 ドキュメントルートから取得されます。 例えば、http://example.com/foo/bar.php というアドレス上にあるスクリプトでは $_SERVER['PHP_SELF']/foo/bar.php となります。 __FILE__ 定数 には、カレント(すなわち読み込まれた)ファイルのパスとファイル名が含まれます。 PHP がコマンドラインから実行される場合、PHP 4.3.0 以降、 この変数にはスクリプト名が含まれます。これより前のバージョンでは、 この変数は使用できません。
'argv'
スクリプトに渡された引数の配列です。スクリプトがコマンドラインから 実行された場合、C 言語スタイルでコマンドライン引数に アクセスすることができます。GET メソッドを通してコールされた場合には 検索引数が格納されます。
'argc'
スクリプトに渡されたコマンドライン引数の数 (コマンドラインから実行した場合) です。
'GATEWAY_INTERFACE'
サーバーが使用している CGI のバージョンです。 例 'CGI/1.1'
'SERVER_ADDR'
現在のスクリプトが実行されているサーバーの IP アドレスです。
'SERVER_NAME'
現在のスクリプトが実行されているサーバーのホスト名です。 スクリプトがバーチャルホスト上で実行されている場合は そのバーチャルホスト名となります。
'SERVER_SOFTWARE'
レスポンスヘッダ上に書かれている、 サーバーの認識文字列です。
'SERVER_PROTOCOL'
ページがリクエストされた際のプロトコル名とバージョンです。 例.'HTTP/1.0'
'REQUEST_METHOD'
ページにアクセスする際に使用されたリクエストのメソッド名です。 'GET', 'HEAD', 'POST', 'PUT' など。

注意:

リクエストのメソッドが HEAD だった場合、 PHP スクリプトはヘッダを送信した後(言い換えれば、 出力バッファリングを行わずに全出力を処理した後)に終了します。

'REQUEST_TIME'
リクエストの開始時のタイムスタンプ。PHP 5.1.0 以降で利用可能。
'REQUEST_TIME_FLOAT'
リクエストの開始時のタイムスタンプ (マイクロ秒までの精度)。 PHP 5.4.0 以降で利用可能。
'QUERY_STRING'
ページがアクセスされた際にもし検索引数があればそれが格納されます。
'DOCUMENT_ROOT'
現在実行されているスクリプトが存在するドキュメントルート ディレクトリです。サーバーのコンフィグレーションファイルで 定義されています。
'HTTP_ACCEPT'
現在のリクエストの Accept: ヘッダがもしあれば その内容。
'HTTP_ACCEPT_CHARSET'
現在のリクエストの Accept-Charset: ヘッダが もしあればその内容。例: 'iso-8859-1,*,utf-8'
'HTTP_ACCEPT_ENCODING'
現在のリクエストに Accept-Encoding: ヘッダが もしあればその内容。例: 'gzip'
'HTTP_ACCEPT_LANGUAGE'
現在のリクエストに Accept-Language: ヘッダが もしあればその内容。例: 'en'
'HTTP_CONNECTION'
現在のリクエストに Connection: ヘッダが もしあればその内容。例: 'Keep-Alive'
'HTTP_HOST'
現在のリクエストに Host: ヘッダが もしあればその内容。
'HTTP_REFERER'
現在のページに遷移する前にユーザーエージェントが参照していた ページのアドレス(もしあれば)。これはユーザーエージェントに よってセットされます。全てのユーザーエージェントが これをセットしているわけではなく、また、HTTP_REFERER を変更する機能を持つものもあります。 要するに、信頼するべきものではありません。
'HTTP_USER_AGENT'
現在のリクエストに User-Agent: ヘッダが もしあればその内容。ページにアクセスしてきているユーザーエージェント のしるしの文字列です。典型的な例は、 Mozilla/4.5 [en] (X11; U; Linux 2.2.9 i586)。たとえば、 get_browser() でこの値を使って ページの出力をそのブラウザにあわせたものにすることも できるでしょう。
'HTTPS'
スクリプトが HTTPS プロトコルを通じて実行されている場合に 空でない値が設定されます。

注意: ISAPI を IIS で使用している場合は、HTTPS プロトコルを通さないでリクエストが行われたときの値は off となることに注意しましょう。

'REMOTE_ADDR'
現在ページをみているユーザーの IP アドレス。
'REMOTE_HOST'
現在のページにアクセスしているホスト名。DNS の逆引き検索は ユーザーの REMOTE_ADDR に基づいています。

注意: Web サーバーがこの値を生成できるように設定されている必要があります。 例えば Apache の場合 HostnameLookups Onhttpd.conf に設定されていなければこの値は生成されません。 gethostbyaddr() もご覧ください。

'REMOTE_PORT'
ユーザーのマシンから Web サーバーへの通信に使用されているポート番号
'REMOTE_USER'
認証されたユーザー。
'REDIRECT_REMOTE_USER'
リクエストが内部でリダイレクトされた場合の認証されたユーザー。
'SCRIPT_FILENAME'

現在実行されているスクリプトの絶対パス

注意:

file.php あるいは ../file.php のような相対パスを指定して CLI でスクリプトが実行されている場合、 $_SERVER['SCRIPT_FILENAME'] には ユーザーが指定した相対パスが含まれます。

'SERVER_ADMIN'
Web サーバーの設定ファイルの SERVER_ADMIN (Apache の場合)ディレクティブ にセットされている値。スクリプトがバーチャルホスト上で 実行されている場合、バーチャルホストに対して値が定義されます。
'SERVER_PORT'
Web サーバーの通信ポートとして使用されているポート番号。デフォルトでは '80' ですが、例えば SSL を使用している場合は セキュア HTTP ポートとして設定されている値に変わります。

注意: Apache 2 では、UseCanonicalName = On だけでなく UseCanonicalPhysicalPort = On も設定しないと物理ポート (実際のポート) を取得できません。設定しなければ、 この値は詐称できる状態になり、 物理ポートを返さなくなるかもしれません。 セキュリティに依存するコンテキストで、この値に頼るのは安全ではありません。

'SERVER_SIGNATURE'
サーバー上で生成されたページに追加される、 サーバーのバージョン名とバーチャルホスト名の文字列。 Web サーバーの設定で有効になっていることが必要です。
'PATH_TRANSLATED'
バーチャルからリアルへのマッピングがなされた後の、 現在のスクリプトのファイルシステム上(ドキュメントルートではなく) でのパス。

注意: PHP 4.3.2 以降、PATH_TRANSLATED は、 Apache 2 SAPI において暗黙のうちに設定されなく なりました。一方、Apache 1 では、この値が Apache により設定されない場合、 SCRIPT_FILENAME と同じ値に設定されます。 この変更は、PATH_TRANSLATEDPATH_INFO が定義されている場合のみ 存在するべきであるという CGI の規約を満たすために 行われました。 Apache 2 ユーザーは、PATH_INFO を定義するために httpd.conf の中で AcceptPathInfo = On を使用することが可能です。

'SCRIPT_NAME'
現在のスクリプトのパス。 スクリプト自身のページを指定するのに有用です。 __FILE__ 定数には、カレント(すなわち読み込まれた)ファイルのパスとファイル名が 含まれます。
'REQUEST_URI'
ページにアクセスするために指定された URI。例えば、 '/index.html'
'PHP_AUTH_DIGEST'
HTTP ダイジェスト認証を 行っている場合、クライアントから送られた 'Authorization' ヘッダの 内容が設定されます(適切な認証処理を行うために利用します)。
'PHP_AUTH_USER'
HTTP 認証しているときにそのユーザー名がセットされます。
'PHP_AUTH_PW'
HTTP 認証しているときにそのユーザーの パスワードがセットされます。
'AUTH_TYPE'
HTTP 認証しているときにその認証形式がセットされます。
'PATH_INFO'
実際のスクリプトファイル名とクエリ文字列の間にある、クライアントが提供するパス名情報。 たとえば、現在のスクリプトに http://www.example.com/php/path_info.php/some/stuff?foo=bar という URL でアクセスしていた場合の $_SERVER['PATH_INFO']/some/stuff となります。
'ORIG_PATH_INFO'
PHP で処理される前の 'PATH_INFO' の原本。

変更履歴

バージョン 説明
5.4.0 $HTTP_SERVER_VARS は使えなくなりました。 長い形式の配列への登録が廃止されたからです。
5.3.0 register_long_arrays ディレクティブを使って $HTTP_SERVER_VARS を有効にする機能が、非推奨になりました。
4.1.0 $_SERVER が導入され、 $HTTP_SERVER_VARS は非推奨となりました。

例1 $_SERVER の例

<?php
echo $_SERVER['SERVER_NAME'];
?>

上の例の出力は、 たとえば以下のようになります。

www.example.com

注意

注意:

これは 'スーパーグローバル' あるいは自動グローバル変数と呼ばれるものです。 スクリプト全体を通してすべてのスコープで使用することができます。 関数やメソッドの内部で使用する場合にも global $variable; とする必要はありません。

add a note add a note

User Contributed Notes 50 notes

up
53
zeufonlinux at gmail dot com
1 year ago
Just a PHP file to put on your local server (as I don't have enough memory)

<?php
$indicesServer
= array('PHP_SELF',
'argv',
'argc',
'GATEWAY_INTERFACE',
'SERVER_ADDR',
'SERVER_NAME',
'SERVER_SOFTWARE',
'SERVER_PROTOCOL',
'REQUEST_METHOD',
'REQUEST_TIME',
'REQUEST_TIME_FLOAT',
'QUERY_STRING',
'DOCUMENT_ROOT',
'HTTP_ACCEPT',
'HTTP_ACCEPT_CHARSET',
'HTTP_ACCEPT_ENCODING',
'HTTP_ACCEPT_LANGUAGE',
'HTTP_CONNECTION',
'HTTP_HOST',
'HTTP_REFERER',
'HTTP_USER_AGENT',
'HTTPS',
'REMOTE_ADDR',
'REMOTE_HOST',
'REMOTE_PORT',
'REMOTE_USER',
'REDIRECT_REMOTE_USER',
'SCRIPT_FILENAME',
'SERVER_ADMIN',
'SERVER_PORT',
'SERVER_SIGNATURE',
'PATH_TRANSLATED',
'SCRIPT_NAME',
'REQUEST_URI',
'PHP_AUTH_DIGEST',
'PHP_AUTH_USER',
'PHP_AUTH_PW',
'AUTH_TYPE',
'PATH_INFO',
'ORIG_PATH_INFO') ;

echo
'<table cellpadding="10">' ;
foreach (
$indicesServer as $arg) {
    if (isset(
$_SERVER[$arg])) {
        echo
'<tr><td>'.$arg.'</td><td>' . $_SERVER[$arg] . '</td></tr>' ;
    }
    else {
        echo
'<tr><td>'.$arg.'</td><td>-</td></tr>' ;
    }
}
echo
'</table>' ;

/*

That will give you the result of each variable like (if the file is server_indices.php at the root and Apache Web directory is in E:\web) :

PHP_SELF    /server_indices.php
argv    -
argc    -
GATEWAY_INTERFACE    CGI/1.1
SERVER_ADDR    127.0.0.1
SERVER_NAME    localhost
SERVER_SOFTWARE    Apache/2.2.22 (Win64) PHP/5.3.13
SERVER_PROTOCOL    HTTP/1.1
REQUEST_METHOD    GET
REQUEST_TIME    1361542579
REQUEST_TIME_FLOAT    -
QUERY_STRING   
DOCUMENT_ROOT    E:/web/
HTTP_ACCEPT    text/html,application/xhtml+xml,application/xml;q=0.9,*/
*;q=0.8
HTTP_ACCEPT_CHARSET    ISO
-8859-1,utf-8;q=0.7,*;q=0.3
HTTP_ACCEPT_ENCODING    gzip
,deflate,sdch
HTTP_ACCEPT_LANGUAGE    fr
-FR,fr;q=0.8,en-US;q=0.6,en;q=0.4
HTTP_CONNECTION    keep
-alive
HTTP_HOST    localhost
HTTP_REFERER    http
://localhost/
HTTP_USER_AGENT    Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.17 (KHTML, like Gecko) Chrome/24.0.1312.57 Safari/537.17
HTTPS   
-
REMOTE_ADDR    127.0.0.1
REMOTE_HOST   
-
REMOTE_PORT    65037
REMOTE_USER   
-
REDIRECT_REMOTE_USER    -
SCRIPT_FILENAME    E:/web/server_indices.php
SERVER_ADMIN    myemail
@personal.us
SERVER_PORT    80
SERVER_SIGNATURE   
PATH_TRANSLATED   
-
SCRIPT_NAME    /server_indices.php
REQUEST_URI   
/server_indices.php
PHP_AUTH_DIGEST   
-
PHP_AUTH_USER    -
PHP_AUTH_PW    -
AUTH_TYPE    -
PATH_INFO    -
ORIG_PATH_INFO    -

*/
?>
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16
Lord Mac
5 years ago
An even *more* improved version...

<?php
phpinfo
(32);
?>
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17
Vladimir Kornea
5 years ago
1. All elements of the $_SERVER array whose keys begin with 'HTTP_' come from HTTP request headers and are not to be trusted.

2. All HTTP headers sent to the script are made available through the $_SERVER array, with names prefixed by 'HTTP_'.

3. $_SERVER['PHP_SELF'] is dangerous if misused. If login.php/nearly_arbitrary_string is requested, $_SERVER['PHP_SELF'] will contain not just login.php, but the entire login.php/nearly_arbitrary_string. If you've printed $_SERVER['PHP_SELF'] as the value of the action attribute of your form tag without performing HTML encoding, an attacker can perform XSS attacks by offering users a link to your site such as this:

<a href='http://www.example.com/login.php/"><script type="text/javascript">...</script><span a="'>Example.com</a>

The javascript block would define an event handler function and bind it to the form's submit event. This event handler would load via an <img> tag an external file, with the submitted username and password as parameters.

Use $_SERVER['SCRIPT_NAME'] instead of $_SERVER['PHP_SELF']. HTML encode every string sent to the browser that should not be interpreted as HTML, unless you are absolutely certain that it cannot contain anything that the browser can interpret as HTML.
up
7
cupy at email dot cz
5 years ago
Tech note:
$_SERVER['argc'] and $_SERVER['argv'][] has some funny behaviour,
used from linux (bash) commandline, when called like
"php ./script_name.php 0x020B"
there is everything correct, but
"./script_name.php 0x020B"
is not correct - "0" is passed instead of "0x020B" as $_SERVER['argv'][1] - see the script below.
Looks like the parameter is not passed well from bash to PHP.
(but, inspected on the level of bash, 0x020B is understood well as $1)

try this example:

------------->8------------------
cat ./script_name.php
#! /usr/bin/php

if( $_SERVER['argc'] == 2)
  {
    // funny... we have to do this trick to pass e.g. 0x020B from parameters
    // ignore this: "PHP Notice:  Undefined offset:  2 in ..."
    $EID = $_SERVER['argv'][1] + $_SERVER['argv'][2] + $_SERVER['argv'][3];
  }
else
   {        // default
     $EID = 0x0210; // PPS failure
   }
up
14
MarkAgius at markagius dot co dot uk
3 years ago
You have missed 'REDIRECT_STATUS'

Very useful if you point all your error pages to the same file.

File; .htaccess
# .htaccess file.

ErrorDocument 404 /error-msg.php
ErrorDocument 500 /error-msg.php
ErrorDocument 400 /error-msg.php
ErrorDocument 401 /error-msg.php
ErrorDocument 403 /error-msg.php
# End of file.

File; error-msg.php
<?php
  $HttpStatus
= $_SERVER["REDIRECT_STATUS"] ;
  if(
$HttpStatus==200) {print "Document has been processed and sent to you.";}
  if(
$HttpStatus==400) {print "Bad HTTP request ";}
  if(
$HttpStatus==401) {print "Unauthorized - Iinvalid password";}
  if(
$HttpStatus==403) {print "Forbidden";}
  if(
$HttpStatus==500) {print "Internal Server Error";}
  if(
$HttpStatus==418) {print "I'm a teapot! - This is a real value, defined in 1998";}

?>
up
11
Richard York
5 years ago
Not documented here is the fact that $_SERVER is populated with some pretty useful information when accessing PHP via the shell.

["_SERVER"]=>
  array(24) {
    ["MANPATH"]=>
    string(48) "/usr/share/man:/usr/local/share/man:/usr/X11/man"
    ["TERM"]=>
    string(11) "xterm-color"
    ["SHELL"]=>
    string(9) "/bin/bash"
    ["SSH_CLIENT"]=>
    string(20) "127.0.0.1 41242 22"
    ["OLDPWD"]=>
    string(60) "/Library/WebServer/Domains/www.example.com/private"
    ["SSH_TTY"]=>
    string(12) "/dev/ttys000"
    ["USER"]=>
    string(5) "username"
    ["MAIL"]=>
    string(15) "/var/mail/username"
    ["PATH"]=>
    string(57) "/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin"
    ["PWD"]=>
    string(56) "/Library/WebServer/Domains/www.example.com/www"
    ["SHLVL"]=>
    string(1) "1"
    ["HOME"]=>
    string(12) "/Users/username"
    ["LOGNAME"]=>
    string(5) "username"
    ["SSH_CONNECTION"]=>
    string(31) "127.0.0.1 41242 10.0.0.1 22"
    ["_"]=>
    string(12) "/usr/bin/php"
    ["__CF_USER_TEXT_ENCODING"]=>
    string(9) "0x1F5:0:0"
    ["PHP_SELF"]=>
    string(10) "Shell.php"
    ["SCRIPT_NAME"]=>
    string(10) "Shell.php"
    ["SCRIPT_FILENAME"]=>
    string(10) "Shell.php"
    ["PATH_TRANSLATED"]=>
    string(10) "Shell.php"
    ["DOCUMENT_ROOT"]=>
    string(0) ""
    ["REQUEST_TIME"]=>
    int(1247162183)
    ["argv"]=>
    array(1) {
      [0]=>
      string(10) "Shell.php"
    }
    ["argc"]=>
    int(1)
  }
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6
rulerof at gmail dot com
4 years ago
I needed to get the full base directory of my script local to my webserver, IIS 7 on Windows 2008.

I ended up using this:

<?php
function GetBasePath() {
    return
substr($_SERVER['SCRIPT_FILENAME'], 0, strlen($_SERVER['SCRIPT_FILENAME']) - strlen(strrchr($_SERVER['SCRIPT_FILENAME'], "\\")));
}
?>

And it returned C:\inetpub\wwwroot\<applicationfolder> as I had hoped.
up
6
silverquick at gmail dot com
6 years ago
I think the HTTPS element will only be present under Apache 2.x. It's not in the list of "special" variables here:
http://httpd.apache.org/docs/1.3/mod/mod_rewrite.html#RewriteCond
But it is here:
http://httpd.apache.org/docs/2.0/mod/mod_rewrite.html#rewritecond
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12
chris
5 years ago
A table of everything in the $_SERVER array can be found near the bottom of the output of phpinfo();
up
5
jonbarnett at gmail dot com
5 years ago
It's worth noting that $_SERVER variables get created for any HTTP request headers, including those you might invent:

If the browser sends an HTTP request header of:
X-Debug-Custom: some string

Then:

<?php
$_SERVER
['HTTP_X_DEBUG_CUSTOM']; // "some string"
?>

There are better ways to identify the HTTP request headers sent by the browser, but this is convenient if you know what to expect from, for example, an AJAX script with custom headers.

Works in PHP5 on Apache with mod_php.  Don't know if this is true from other environments.
up
6
krinklemail at gmail dot com
1 year ago
If requests to your PHP script send a header "Content-Type" or/ "Content-Length" it will, contrary to regular HTTP headers, not appear in $_SERVER as $_SERVER['HTTP_CONTENT_TYPE']. PHP removes these (per CGI/1.1 specification[1]) from the HTTP_ match group.

They are still accessible, but only if the request was a POST request. When it is, it'll be available as:
$_SERVER['CONTENT_LENGTH']
$_SERVER['CONTENT_TYPE']

[1] https://www.ietf.org/rfc/rfc3875
up
3
wyattstorch42 at outlook dot com
1 year ago
<?php
/*
* I wrote this because I was including a file with classes in it. Let's say that
* I have a contact page at mysite.com/contact/index.php and a Form class at
* mysite.com/classes/Form.php. So in index.php, I have this statement:
* require '../classes/Form.php';
* The Form class includes a method to generate the HTML markup for a number of
* form elements, including a CAPTCHA image and associated text field. To do so,
* it must generate an <img /> element and give it a src of Form.php?captcha.
* But I wanted it to automatically generate a src attribute without index.php
* giving it a relative path. This script comes in handy by automatically
* locating the directory that contains the included file (Form.php) and converting
* it from an absolute path to a relative path that could be used for an img src,
* an a href, a link href, etc.
*/
function relativeURL () {
   
$dir = str_replace('\\', '/', __DIR__);
       
// Resolves inconsistency with PATH_SEPARATOR on Windows vs. Linux
        // Use dirname(__FILE__) in place of __DIR__ for older PHP versions
   
return substr($dir, strlen($_SERVER['DOCUMENT_ROOT']));
       
// Clip off the part of the path outside of the document root
}

/*
*contact/index.php
*/
require '../classes/Form.php';
new
Form()->drawCaptchaField();
   
// Writes: <img src="/classes/Form.php?captcha" />

   
/*
* classes/Form.php
*/
if (isset($_GET['captcha'])) {
   
// generate/return CAPTCHA image
}

class
Form {
   
// ...
   
public function drawCaptchaField () {
        echo
'<img src="'.relativeURL().'?captcha" />';
    }
}
?>
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10
mirko dot steiner at slashdevslashnull dot de
5 years ago
<?php

// RFC 2616 compatible Accept Language Parser
// http://www.ietf.org/rfc/rfc2616.txt, 14.4 Accept-Language, Page 104
// Hypertext Transfer Protocol -- HTTP/1.1

foreach (explode(',', $_SERVER['HTTP_ACCEPT_LANGUAGE']) as $lang) {
   
$pattern = '/^(?P<primarytag>[a-zA-Z]{2,8})'.
   
'(?:-(?P<subtag>[a-zA-Z]{2,8}))?(?:(?:;q=)'.
   
'(?P<quantifier>\d\.\d))?$/';

   
$splits = array();

   
printf("Lang:,,%s''\n", $lang);
    if (
preg_match($pattern, $lang, $splits)) {
       
print_r($splits);
    } else {
        echo
"\nno match\n";
    }
}

?>

example output:

Google Chrome 3.0.195.27 Windows xp

Lang:,,de-DE''
Array
(
    [0] => de-DE
    [primarytag] => de
    [1] => de
    [subtag] => DE
    [2] => DE
)
Lang:,,de;q=0.8''
Array
(
    [0] => de;q=0.8
    [primarytag] => de
    [1] => de
    [subtag] =>
    [2] =>
    [quantifier] => 0.8
    [3] => 0.8
)
Lang:,,en-US;q=0.6''
Array
(
    [0] => en-US;q=0.6
    [primarytag] => en
    [1] => en
    [subtag] => US
    [2] => US
    [quantifier] => 0.6
    [3] => 0.6
)
Lang:,,en;q=0.4''
Array
(
    [0] => en;q=0.4
    [primarytag] => en
    [1] => en
    [subtag] =>
    [2] =>
    [quantifier] => 0.4
    [3] => 0.4
)
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8
@44it
1 year ago
All the $_SERVER[''] In php :

<?php

echo "PHP_SELF : " . $_SERVER['PHP_SELF'] . "<br />";
echo
"GATEWAY_INTERFACE : " . $_SERVER['GATEWAY_INTERFACE'] . "<br />";
echo
"SERVER_ADDR : " . $_SERVER['SERVER_ADDR'] . "<br />";
echo
"SERVER_NAME : " . $_SERVER['SERVER_NAME'] . "<br />";
echo
"SERVER_SOFTWARE : " . $_SERVER['SERVER_SOFTWARE'] . "<br />";
echo
"SERVER_PROTOCOL : " . $_SERVER['SERVER_PROTOCOL'] . "<br />";
echo
"REQUEST_METHOD : " . $_SERVER['REQUEST_METHOD'] . "<br />";
echo
"REQUEST_TIME : " . $_SERVER['REQUEST_TIME'] . "<br />";
echo
"REQUEST_TIME_FLOAT : " . $_SERVER['REQUEST_TIME_FLOAT'] . "<br />";
echo
"QUERY_STRING : " . $_SERVER['QUERY_STRING'] . "<br />";
echo
"DOCUMENT_ROOT : " . $_SERVER['DOCUMENT_ROOT'] . "<br />";
echo
"HTTP_ACCEPT : " . $_SERVER['HTTP_ACCEPT'] . "<br />";
echo
"HTTP_ACCEPT_CHARSET : " . $_SERVER['HTTP_ACCEPT_CHARSET'] . "<br />";
echo
"HTTP_ACCEPT_ENCODING : " . $_SERVER['HTTP_ACCEPT_ENCODING'] . "<br />";
echo
"HTTP_ACCEPT_LANGUAGE : " . $_SERVER['HTTP_ACCEPT_LANGUAGE'] . "<br />";
echo
"HTTP_CONNECTION : " . $_SERVER['HTTP_CONNECTION'] . "<br />";
echo
"HTTP_HOST : " . $_SERVER['HTTP_HOST'] . "<br />";
echo
"HTTP_REFERER : " . $_SERVER['HTTP_REFERER'] . "<br />";
echo
"HTTP_USER_AGENT : " . $_SERVER['HTTP_USER_AGENT'] . "<br />";
echo
"HTTPS : " . $_SERVER['HTTPS'] . "<br />";
echo
"REMOTE_ADDR : " . $_SERVER['REMOTE_ADDR'] . "<br />";
echo
"REMOTE_HOST : " . $_SERVER['REMOTE_HOST'] . "<br />";
echo
"REMOTE_PORT : " . $_SERVER['REMOTE_PORT'] . "<br />";
echo
"REMOTE_USER : " . $_SERVER['REMOTE_USER'] . "<br />";
echo
"REDIRECT_REMOTE_USER : " . $_SERVER['REDIRECT_REMOTE_USER'] . "<br />";
echo
"SCRIPT_FILENAME : " . $_SERVER['SCRIPT_FILENAME'] . "<br />";
echo
"SERVER_ADMIN : " . $_SERVER['SERVER_ADMIN'] . "<br />";
echo
"SERVER_PORT : " . $_SERVER['SERVER_PORT'] . "<br />";
echo
"SERVER_SIGNATURE : " . $_SERVER['SERVER_SIGNATURE'] . "<br />";
echo
"PATH_TRANSLATED : " . $_SERVER['PATH_TRANSLATED'] . "<br />";
echo
"SCRIPT_NAME : " . $_SERVER['SCRIPT_NAME'] . "<br />";
echo
"REQUEST_URI : " . $_SERVER['REQUEST_URI'] . "<br />";
echo
"PHP_AUTH_DIGEST : " . $_SERVER['PHP_AUTH_DIGEST'] . "<br />";
echo
"PHP_AUTH_USER : " . $_SERVER['PHP_AUTH_USER'] . "<br />";
echo
"PHP_AUTH_PW : " . $_SERVER['PHP_AUTH_PW'] . "<br />";
echo
"AUTH_TYPE : " . $_SERVER['AUTH_TYPE'] . "<br />";
echo
"PATH_INFO : " . $_SERVER['PATH_INFO'] . "<br />";
echo
"ORIG_PATH_INFO : " . $_SERVER['ORIG_PATH_INFO'] . "<br />";

?>

By : @44it

[EDITOR'S NOTE: Removed external link. EDITED BY: thiago]
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8
steve at sc-fa dot com
5 years ago
If you are serving from behind a proxy server, you will almost certainly save time by looking at what these $_SERVER variables do on your machine behind the proxy.  

$_SERVER['HTTP_X_FORWARDED_FOR'] in place of $_SERVER['REMOTE_ADDR']

$_SERVER['HTTP_X_FORWARDED_HOST'] and
$_SERVER['HTTP_X_FORWARDED_SERVER'] in place of (at least in our case,) $_SERVER['SERVER_NAME']
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3
dtomasiewicz at gmail dot com
4 years ago
To get an associative array of HTTP request headers formatted similarly to get_headers(), this will do the trick:

<?php
/**
* Transforms $_SERVER HTTP headers into a nice associative array. For example:
*   array(
*       'Referer' => 'example.com',
*       'X-Requested-With' => 'XMLHttpRequest'
*   )
*/
function get_request_headers() {
   
$headers = array();
    foreach(
$_SERVER as $key => $value) {
        if(
strpos($key, 'HTTP_') === 0) {
           
$headers[str_replace(' ', '-', ucwords(str_replace('_', ' ', strtolower(substr($key, 5)))))] = $value;
        }
    }
    return
$headers;
}
?>
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3
pomat at live dot it
1 year ago
$_SERVER['DOCUMENT_ROOT'] may contain backslashes on windows systems, and of course it may or may not have a trailing slash (backslash).
I saw the following as an example of the proper way we're supposed to deal with this issue:

<?php
include(dirname($_SERVER['DOCUMENT_ROOT']) . DIRECTORY_SEPARATOR . 'file.php');
?>

Ok, the latter may be used to access a file inside the parent directory of the document root, but actually does not properly address the issue.
In the end, don't warry about. It should be safe to use forward slashes and append a trailing slash in all cases.
Let's say we have this:

<?php
$path
= 'subdir/file.php';
$result = $_SERVER['DOCUMENT_ROOT'] . '/' . $path;
?>

On linux $result might be something like
1) "/var/www/subdir/file.php"
2) "/var/www//subdir/file.php"
String 2 is parsed the same as string 1 (have a try with command 'cd').

On windows $result might be something like
1) "C:/apache/htdocs/subdir/file.php"
2) "C:/apache/htdocs//subdir/file.php"
3) "C:\apache\htdocs/subdir/file.php"
4) "C:\apache\htdocs\/subdir/file.php"
All those strings are parsed as "C:\apache\htdocs\subdir\file.php" (have a try with 'cd').
up
2
sendmailz1987 at gmail dot com
1 year ago
Example:

$current = $_SERVER['SERVER_NAME'] . $_SERVER['PHP_SELF'];

echo $current;

will output the root to the current page, including url and document root, something like:

example.com/users/profile.php
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3
jarrod at squarecrow dot com
5 years ago
$_SERVER['DOCUMENT_ROOT'] is incredibly useful especially when working in your development environment. If you're working on large projects you'll likely be including a large number of files into your pages. For example:

<?php
//Defines constants to use for "include" URLS - helps keep our paths clean

       
define("REGISTRY_CLASSES"$_SERVER['DOCUMENT_ROOT']."/SOAP/classes/");
       
define("REGISTRY_CONTROLS", $_SERVER['DOCUMENT_ROOT']."/SOAP/controls/");

       
define("STRING_BUILDER",     REGISTRY_CLASSES. "stringbuilder.php");
       
define("SESSION_MANAGER",     REGISTRY_CLASSES. "sessionmanager.php");
       
define("STANDARD_CONTROLS",    REGISTRY_CONTROLS."standardcontrols.php");
?>

In development environments, you're rarely working with your root folder, especially if you're running PHP locally on your box and using DOCUMENT_ROOT is a great way to maintain URL conformity. This will save you hours of work preparing your application for deployment from your box to a production server (not to mention save you the headache of include path failures).
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4
info at mtprod dot com
5 years ago
On Windows IIS 7 you must use $_SERVER['LOCAL_ADDR'] rather than $_SERVER['SERVER_ADDR'] to get the server's IP address.
up
3
Tonin
6 years ago
When using the $_SERVER['SERVER_NAME'] variable in an apache virtual host setup with a ServerAlias directive, be sure to check the UseCanonicalName apache directive.  If it is On, this variable will always have the apache ServerName value.  If it is Off, it will have the value given by the headers sent by the browser.

Depending on what you want to do the content of this variable, put in On or Off.
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4
Tom
2 years ago
Be warned that most contents of the Server-Array (even $_SERVER['SERVER_NAME']) are provided by the client and can be manipulated. They can also be used for injections and thus MUST be checked and treated like any other user input.
up
4
wbeaumo1 at gmail dot com
4 years ago
Don't forget $_SERVER['HTTP_COOKIE']. It contains the raw value of the 'Cookie' header sent by the user agent.
up
4
php at isnoop dot net
4 years ago
Use the apache SetEnv directive to set arbitrary $_SERVER variables in your vhost or apache config.

SetEnv varname "variable value"
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5
pudding06 at gmail dot com
5 years ago
Here's a simple, quick but effective way to block unwanted external visitors to your local server:

<?php
// only local requests
if ($_SERVER['REMOTE_ADDR'] !== '127.0.0.1') die(header("Location: /"));
?>

This will direct all external traffic to your home page. Of course you could send a 404 or other custom error. Best practice is not to stay on the page with a custom error message as you acknowledge that the page does exist. That's why I redirect unwanted calls to (for example) phpmyadmin.
up
3
Stefano (info at sarchittu dot org)
4 years ago
A way to get the absolute path of your page, independent from the site position (so works both on local machine and on server without setting anything) and from the server OS (works both on Unix systems and Windows systems).

The only parameter it requires is the folder in which you place this script
So, for istance, I'll place this into my SCRIPT folder, and I'll write SCRIPT word length in $conflen

<?php
$conflen
=strlen('SCRIPT');
$B=substr(__FILE__,0,strrpos(__FILE__,'/'));
$A=substr($_SERVER['DOCUMENT_ROOT'], strrpos($_SERVER['DOCUMENT_ROOT'], $_SERVER['PHP_SELF']));
$C=substr($B,strlen($A));
$posconf=strlen($C)-$conflen-1;
$D=substr($C,1,$posconf);
$host='http://'.$_SERVER['SERVER_NAME'].'/'.$D;
?>

$host will finally contain the absolute path.
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3
admin at NOSpAM dot sinfocol dot org
4 years ago
I was testing with the $_SERVER variable and some request method, and I found that with apache I can put an arbitrary method.

For example, I have an script called "server.php" in my example webpage with the next code:

<?php
echo $_SERVER['REQUEST_METHOD'];
?>

And I made this request:
c:\>nc -vv www.example.com 80
example.com [x.x.x.x] 80 (http) open
ArbitratyMethod /server.php HTTP/1.1
Host: wow.sinfocol.org
Connection: Close

The response of the server is the next:
HTTP/1.1 200 OK
Date: Fri, 15 Jan 2010 05:14:09 GMT
Server: Apache
Connection: close
Transfer-Encoding: chunked
Content-Type: text/html

ArbitratyMethod

So, be carefully when include the $_SERVER['REQUEST_METHOD'] in any script, this kind of "bug" is old and could be dangerous.
up
2
dii3g0
2 years ago
Proccess path_info

<?php
function get_path_info()
{
    if( !
array_key_exists('PATH_INFO', $_SERVER) )
    {
       
$pos = strpos($_SERVER['REQUEST_URI'], $_SERVER['QUERY_STRING']);
   
       
$asd = substr($_SERVER['REQUEST_URI'], 0, $pos - 2);
       
$asd = substr($asd, strlen($_SERVER['SCRIPT_NAME']) + 1);
       
        return
$asd;   
    }
    else
    {
        return
trim($_SERVER['PATH_INFO'], '/');
    }
}
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2
jette at nerdgirl dot dk
6 years ago
Windows running IIS v6 does not include $_SERVER['SERVER_ADDR']

If you need to get the IP addresse, use this instead:

<?php
$ipAddress
= gethostbyname($_SERVER['SERVER_NAME']);
?>
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1
geoffrey dot hoffman at gmail dot com
6 years ago
If you are looking at $_SERVER['HTTP_USER_AGENT'] to determine whether your user is on a mobile device, you may want to visit these resources:

http://wurfl.sourceforge.net/

http://www.zytrax.com/tech/web/mobile_ids.html
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1
kamazee at gmail dot com
4 years ago
$_SERVER['DOCUMENT_ROOT'] in different environments may has trailing slash or not, so be careful when including files from $_SERVER['DOCUMENT_ROOT']:
<?php
include(dirname($_SERVER['DOCUMENT_ROOT']) . DIRECTORY_SEPARATOR . 'file.php')
?>
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1
Gary Mathis
1 month ago
The best way to see all variables within the $_SERVER array, that I have found, is as follows:

<?php
foreach($_SERVER as $key => $value){
echo
'$_SERVER["'.$key.'"] = '.$value."<br />";
}
?>

This will tell you which ones are available on your server and what they are set to.
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0
softontherocks at gmail dot com
24 days ago
I want to share with you a full function to get the remote IP that calls a PHP url using the $_SERVER array.

function getRealIP(){
 if( $_SERVER['HTTP_X_FORWARDED_FOR'] != '' ){
  $client_ip =
   ( !empty($_SERVER['REMOTE_ADDR']) ) ?
    $_SERVER['REMOTE_ADDR']
   :
            ( ( !empty($_ENV['REMOTE_ADDR']) ) ?
    $_ENV['REMOTE_ADDR']
    :
    "unknown" );
 
  $entries = split('[, ]', $_SERVER['HTTP_X_FORWARDED_FOR']);
 
  reset($entries);
  while (list(, $entry) = each($entries)){
   $entry = trim($entry);
   if ( preg_match("/^([0-9]+\.[0-9]+\.[0-9]+\.[0-9]+)/", $entry, $ip_list) ){
    // http://www.faqs.org/rfcs/rfc1918.html
    $private_ip = array(
     '/^0\./',
     '/^127\.0\.0\.1/',
     '/^192\.168\..*/',
     '/^172\.((1[6-9])|(2[0-9])|(3[0-1]))\..*/',
     '/^10\..*/');
 
    $found_ip = preg_replace($private_ip, $client_ip, $ip_list[1]);
 
    if ($client_ip != $found_ip){
     $client_ip = $found_ip;
     break;
    }
   }
  }
 } else {
  $client_ip =
   ( !empty($_SERVER['REMOTE_ADDR']) ) ?
    $_SERVER['REMOTE_ADDR']
   :
    ( ( !empty($_ENV['REMOTE_ADDR']) ) ?
    $_ENV['REMOTE_ADDR']
    :
    "unknown" );
 }
 return $client_ip;
}

This function was found in http://softontherocks.blogspot.com/2013/07/obtener-la-direccion-ip-que-solicita.html
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0
Rodolfo Gonzalez Costa Rica
7 months ago
This is a short script to know what values are defined

<?php

echo "<textarea>";
print_r($_SERVER);
echo
"</textarea>";

?>
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0
Dean Jenkins
1 year ago
To get the name and web path of the current script

<?php
$scriptname
=end(explode('/',$_SERVER['PHP_SELF']));
$scriptpath=str_replace($scriptname,'',$_SERVER['PHP_SELF']);
?>
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-1
info at salientdigital dot com
10 months ago
A word of caution...

If you have some PHP code or file that is included from within a web request via Apache + PHP, as well as from a command line script, be very careful to inspect the keys inside of $_SERVER that you intend to use.

The keys and values are different, and in fact, it also matters if you are running as your_user, sudo php from your_user, or from root.

For example, I just found out that $_SERVER['PWD'] is not available if you run from the command line via sudo (PHP 5.2x, CentOS, YMMV).

To make a test, create a file called server.php with the following content:

<?php
var_dump
($_SERVER);
?>

Then from the commandline:
your_account/dir #$ php server.php > your_account_server.txt
your_account/dir #$ sudo php server.php > your_account_sudo_server.txt
your_account/dir #$ sudo bash
root/dir #$ php server.php > root_server.txt

Now you can diff the output of each of these three files and inspect against what you get when viewing the $_SERVER section of phpinfo() from a web request. You may find the differences to be quite striking, in all, four different ways to run the same PHP file!
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-2
LOL
2 years ago
For an hosting that use windows I have used this script to make REQUEST_URI to be correctly setted on IIS
<?php
function request_URI() {
    if(!isset(
$_SERVER['REQUEST_URI'])) {
       
$_SERVER['REQUEST_URI'] = $_SERVER['SCRIPT_NAME'];
        if(
$_SERVER['QUERY_STRING']) {
           
$_SERVER['REQUEST_URI'] .= '?' . $_SERVER['QUERY_STRING'];
        }
    }
    return
$_SERVER['REQUEST_URI'];
}
$_SERVER['REQUEST_URI'] = request_URI();
?>
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-2
Josh Fremer
3 years ago
HTTPS

Set to a non-empty value if the script was queried through the HTTPS protocol.

Note: Note that when using ISAPI with IIS, the value will be off if the request was not made through the HTTPS protocol.

=-=-=

To clarify this, the value is the string "off", so a specific non-empty value rather than an empty value as in Apache.
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-3
dragon[dot]dionysius[at]gmail[dot]com
5 years ago
I've updated the function of my previous poster and putted it into my class.

<?php
   
/**
     * Checking HTTP-Header for language
     * needed for various system classes
     *
     * @return    boolean    true/false
     */
   
private function _checkClientLanguage()
    {   
       
$langcode = (!empty($_SERVER['HTTP_ACCEPT_LANGUAGE'])) ? $_SERVER['HTTP_ACCEPT_LANGUAGE'] : '';
       
$langcode = (!empty($langcode)) ? explode(";", $langcode) : $langcode;
       
$langcode = (!empty($langcode['0'])) ? explode(",", $langcode['0']) : $langcode;
       
$langcode = (!empty($langcode['0'])) ? explode("-", $langcode['0']) : $langcode;
        return
$langcode['0'];
    }
?>

Please note, you have to check additional the result! Because the header may be missing or another possible thing, it is malformed. So check the result with a list with languages you support and perhaps you have to load a default language.

<?php

// if result isn't one of my defined languages
           
if(!in_array($lang, $language_list)) {
               
$lang = $language_default; // load default

?>

My HTTP_ACCEPT_LANGUAGE string:
FF3: de-de,de;q=0.8,en-us;q=0.5,en;q=0.3
IE7: de-ch

So, take care of it!
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-3
Anonymous
4 years ago
Use Strict-Transport-Security (STS) to force the use of SSL.
<?php
$use_sts
= TRUE;

if (
$use_sts && isset($_SERVER['HTTPS']) {
 
header('Strict-Transport-Security: max-age=500');
} elseif (
$use_sts && !isset($_SERVER['HTTPS']) {
 
header('Status-Code: 301');
 
header('Location: https://'.$_SERVER["HTTP_HOST"].$_SERVER['REQUEST_URI']);
}
?>
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-3
jeff at example dot com
6 years ago
Note that, in Apache 2, the server settings will affect the variables available in $_SERVER. For example, if you are using SSL, the following directive will dump SSL-related status information, along with the server certificate and client certificate (if present) into the $_SERVER variables:

SSLOptions +StdEnvVars +ExportCertData
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-3
emailfire at gmail dot com
6 years ago
REQUEST_URI is useful, but if you want to get just the file name use:

<?php
$this_page
= basename($_SERVER['REQUEST_URI']);
if (
strpos($this_page, "?") !== false) $this_page = reset(explode("?", $this_page));
?>
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-3
picov at e-link dot it
3 years ago
A simple function to detect if the current page address was rewritten by mod_rewrite:

<?php
public function urlWasRewritten() {
 
$realScriptName=$_SERVER['SCRIPT_NAME'];
 
$virtualScriptName=reset(explode("?", $_SERVER['REQUEST_URI']));
  return !(
$realScriptName==$virtualScriptName);
}
?>
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-3
sabas88 at gmail dot com
1 year ago
I'm the author of this note
http://www.php.net/manual/en/reserved.variables.server.php#100881

I optimized since that note the path function, basically added detection of windows slashes and a partial option

Now is released on github

https://github.com/sabas/magicpath
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-4
Taomyn
6 years ago
'HTTPS'
    Set to a non-empty value if the script was queried through the HTTPS protocol. Note that when using ISAPI with IIS, the value will be off if the request was not made through the HTTPS protocol.

Does the same for IIS7 running PHP as a Fast-CGI application.
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-7
Andrew B
6 years ago
Please note on Windows/IIS - the variable 'USER_AUTH' will return the username/identity of the user accessing the page, i.e. if anonymous access is off, you would normally get back "$domain\$username".
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-8
Megan Mickelson
4 years ago
It makes sense to want to paste the $_SERVER['REQUEST_URI'] on to a page (like on a footer), but be sure to clean it up first with htmlspecialchars() otherwise it poses a cross-site scripting vulnerability.

htmlspecialchars($_SERVER['REQUEST_URI']);

e.g.
http://www.example.com/foo?<script>...

becomes
http://www.example.com/foo?&lt;script&gt;...
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-7
jit_chavan at yahoo dot com
9 months ago
searched $_SERVER["REDIRECT_URL"] for a while and noted that it is not mentioned in php documentation page itself. look like this is only generated by apache server(not others) and using   $_SERVER["REQUEST_URI"] will be useful in some cases as mine.
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-3
derniereclasse at gmail dot com
9 months ago
About $_SERVER['REQUEST_METHOD']
return one of this values :
'GET', 'HEAD', 'POST', 'PUT'. 
but can also return :
'OPTION'
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-15
Thomas Urban
6 years ago
Maybe you're missing information on $_SERVER['CONTENT_TYPE'] or $_SERVER['CONTENT_LENGTH'] as I did. On POST-requests these are available in addition to those listed above.
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