Detailed usage of $_SERVER in PHP

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##$_SERVER['PHP_SELF'] #Currently working The file name of the executed script, related to the document root. $_SERVER['argv'] #Parameters passed to the script.
$_SERVER['argc'] #Contains the number of command line arguments passed to the program (if running in command line mode).
$_SERVER['GATEWAY_INTERFACE'] #The version of the CGI specification used by the server. For example, "CGI/1.1".
$_SERVER['SERVER_NAME'] #The name of the server host where the script is currently running.
$_SERVER['SERVER_SOFTWARE'] #The string of server identification, given in the header when responding to the request.
$_SERVER['SERVER_PROTOCOL'] #The name and version of the communication protocol when requesting the page. For example, "HTTP/1.0".
$_SERVER['REQUEST_METHOD'] #Request method when accessing the page. For example: "GET", "HEAD", "POST", "PUT".
$_SERVER['QUERY_STRING'] #Query string.
$_SERVER['DOCUMENT_ROOT'] #The document root directory where the currently running script is located. Defined in the server configuration file.
$_SERVER['HTTP_ACCEPT'] #Contents of the Accept: header of the current request.
$_SERVER['HTTP_ACCEPT_CHARSET'] #Contents of the Accept-Charset: header of the current request. For example: "iso-8859-1,*,utf-8".
$_SERVER['HTTP_ACCEPT_ENCODING'] #Contents of the Accept-Encoding: header of the current request. For example: "gzip".
$_SERVER['HTTP_ACCEPT_LANGUAGE']#Contents of the Accept-Language: header of the current request. For example: "en".
$_SERVER['HTTP_CONNECTION'] #Contents of the Connection: header of the current request. For example: "Keep-Alive".
$_SERVER['HTTP_HOST'] #Contents of the Host: header of the current request.
$_SERVER['HTTP_REFERER'] #The URL address of the previous page linked to the current page.
$_SERVER['HTTP_USER_AGENT'] #Contents of the User_Agent: header of the current request.
$_SERVER['HTTPS'] — If accessed through https, it is set to a non-empty value (on), otherwise it returns off
$_SERVER['REMOTE_ADDR'] #The IP of the user who is browsing the current page address.
$_SERVER['REMOTE_HOST'] #The host name of the user who is browsing the current page.
$_SERVER['REMOTE_PORT'] #The port used by users to connect to the server.
$_SERVER['SCRIPT_FILENAME'] #The absolute path name of the currently executing script.
$_SERVER['SERVER_ADMIN'] #Administrator information
$_SERVER['SERVER_PORT'] #Port used by the server
$_SERVER['SERVER_SIGNATURE'] #Contains characters for the server version and virtual host name string.
$_SERVER['PATH_TRANSLATED'] #The base path of the file system (not the document root directory) where the current script is located.
$_SERVER['SCRIPT_NAME'] #Contains the path of the current script. This is useful when the page needs to point to itself.
$_SERVER['REQUEST_URI'] #The URI required to access this page. For example, "/index.html".
$_SERVER['PHP_AUTH_USER'] #When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the username entered by the user.
$_SERVER['PHP_AUTH_PW'] #When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the password entered by the user.
$_SERVER['AUTH_TYPE'] #When PHP is running in Apache module mode and is using the HTTP authentication function, this variable is the authentication type.
$_SERVER[”HTTP_X_FORWARDED_FOR”] #Get the real IP address of the client through the proxy server
$_SERVER['HTTP_VIA'] #Proxy server IP
$_SERVER['HTTP_CLIENT_IP'] #Client IP

Server variable: $_SERVER

Note: In PHP 4.1.0 and later versions use. Previous versions, used $HTTP_SERVER_VARS.

$_SERVER is an array containing things like headers, paths, and script locations. The entities of the array are created by the web server. There is no guarantee that all servers will produce all messages; servers may ignore some messages or generate new messages not listed below. This means that a large number of these variables are specified in the CGI 1.1 specification, so you should study it carefully.

This is a "superglobal", or can be described as an automatic global variable. This just means that it works in all scripts. You do not need to use global $_SERVER; to access it within a function or method, as you would with $HTTP_SERVER_VARS.

$HTTP_SERVER_VARS contains the same information, but is not an automatic global variable. (Note: $HTTP_SERVER_VARS and $_SERVER are different variables, and PHP handles them differently.)

These variables are also available in all scripts if the register_globals directive is set; that is, , separated the $_SERVER and $HTTP_SERVER_VARS arrays. For related information, see the security-related chapter Using Register Globals. These individual global variables are not automatic global variables.

You may find that some of the $_SERVER elements listed below are not available. Note that few of the elements listed below are valid (or have no real meaning) if you run PHP from the command line.

"PHP_SELF"
The file name of the currently executing script, related to the document root. For example, using $_SERVER['PHP_SELF'] in a script with the URL address http://easyboor.com/test.php/foo.bar will result in / The result of test.php/foo.bar.

If PHP is running in command line mode, this variable has no effect.

"argv"
The arguments passed to this script. When the script is run in command-line mode, the argv variable is passed to the program as C-style command-line arguments. When the GET method is called, this variable contains the requested data.

"argc"
Contains the number of command line arguments passed to the program (if running in command line mode).

"GATEWAY_INTERFACE"
The version of the CGI specification used by the server. For example, "CGI/1.1".

'SERVER_NAME'
The name of the server host where the script is currently running. If the script is running on a virtual host, the name is determined by the value set for that virtual host.

'SERVER_SOFTWARE'
The string identifying the server, given in the header when responding to the request.

"SERVER_PROTOCOL"
The name and version of the communication protocol when requesting the page. For example, "HTTP/1.0".

"REQUEST_METHOD"
The request method when accessing the page. For example: "GET", "HEAD", "POST", "PUT".

“QUERY_STRING”
The string of query.

"DOCUMENT_ROOT"
The document root directory where the currently running script is located. Defined in the server configuration file.

"HTTP_ACCEPT"
Contents of the Accept: header of the current request.

"HTTP_ACCEPT_CHARSET"
Contents of the Accept-Charset: header of the current request. For example: "iso-8859-1,*,utf-8".

"HTTP_ACCEPT_ENCODING"
Contents of the Accept-Encoding: header of the current request. For example: "gzip".

"HTTP_ACCEPT_LANGUAGE"
Contents of the Accept-Language: header of the current request. For example: "en".

"HTTP_CONNECTION"
Contents of the Connection: header of the current request. For example: "Keep-Alive".

"HTTP_HOST"
Contents of the Host: header of the current request.

"HTTP_REFERER"
The URL address of the previous page linked to the current page. Not all user agents (browsers) will set this variable, and some can also modify HTTP_REFERER manually. Therefore, this variable is not always true.

"HTTP_USER_AGENT"
Contents of the User_Agent: header of the current request. This string indicates information about the user agent accessing this page. A typical example is: Mozilla/4.5 [en] (X11; U; Linux 2.2.9 i586). You can also use get_browser() to get this information.

"REMOTE_ADDR"
The IP address of the user who is browsing the current page.

'REMOTE_HOST'
The host name of the user who is browsing the current page. Reverse domain name resolution is based on the user's REMOTE_ADDR.

Note: The web server must be configured to create this variable. For example Apache requires HostnameLookups On in httpd.conf. See gethostbyaddr().

"REMOTE_PORT"
The port used by users to connect to the server.

"SCRIPT_FILENAME"
The absolute path name of the currently executing script.

"SERVER_ADMIN"
This value specifies the SERVER_ADMIN parameter in the Apache server configuration file. If the script is running on a virtual host, this value is that of that virtual host.

"SERVER_PORT"
The port used by the server. Default is "80". If you use an SSL secure connection, this value is the HTTP port you set.

"SERVER_SIGNATURE"
A string containing the server version and virtual host name.

"PATH_TRANSLATED"
The base path of the file system (not the document root) where the current script is located. This is the result after the server has been imaged from a virtual to real path.

"SCRIPT_NAME"
Contains the path of the current script. This is useful when the page needs to point to itself.

"REQUEST_URI"
The URI required to access this page. For example, "/index.html".

"PHP_AUTH_USER"
When PHP is running in Apache module mode and the HTTP authentication function is being used, this variable is the username entered by the user.

"PHP_AUTH_PW"
When PHP is running in Apache module mode and the HTTP authentication function is being used, this variable is the password entered by the user.

"AUTH_TYPE"
When PHP is running in Apache module mode and the HTTP authentication function is being used, this variable is the authentication type.

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