$_SERVER PHP - headers, paths & script locations

Sitebee

Technical SEO
Staff member
$_SERVER is a PHP superglobal variable that holds information about headers, paths, and script locations.

The example below shows how to use some of the elements in $_SERVER:
Code:
<?php
echo $_SERVER['PHP_SELF'];
echo "<br>";
echo $_SERVER['SERVER_NAME'];
echo "<br>";
echo $_SERVER['HTTP_HOST'];
echo "<br>";
echo $_SERVER['HTTP_REFERER'];
echo "<br>";
echo $_SERVER['HTTP_USER_AGENT'];
echo "<br>";
echo $_SERVER['SCRIPT_NAME'];
?>

The following table lists the most important elements that can go inside $_SERVER:

Element/CodeDescription
$_SERVER['PHP_SELF']Returns the filename of the currently executing script
$_SERVER['GATEWAY_INTERFACE']Returns the version of the Common Gateway Interface (CGI) the server is using
$_SERVER['SERVER_ADDR']Returns the IP address of the host server
$_SERVER['SERVER_NAME']Returns the name of the host server (such as www.w3schools.com)
$_SERVER['SERVER_SOFTWARE']Returns the server identification string (such as Apache/2.2.24)
$_SERVER['SERVER_PROTOCOL']Returns the name and revision of the information protocol (such as HTTP/1.1)
$_SERVER['REQUEST_METHOD']Returns the request method used to access the page (such as POST)
$_SERVER['REQUEST_TIME']Returns the timestamp of the start of the request (such as 1377687496)
$_SERVER['QUERY_STRING']Returns the query string if the page is accessed via a query string
$_SERVER['HTTP_ACCEPT']Returns the Accept header from the current request
$_SERVER['HTTP_ACCEPT_CHARSET']Returns the Accept_Charset header from the current request (such as utf-8,ISO-8859-1)
$_SERVER['HTTP_HOST']Returns the Host header from the current request
$_SERVER['HTTP_REFERER']Returns the complete URL of the current page (not reliable because not all user-agents support it)
$_SERVER['HTTPS']Is the script queried through a secure HTTP protocol
$_SERVER['REMOTE_ADDR']Returns the IP address from where the user is viewing the current page
$_SERVER['REMOTE_HOST']Returns the Hostname from where the user is viewing the current page
$_SERVER['REMOTE_PORT']Returns the port being used on the user's machine to communicate with the webserver
$_SERVER['SCRIPT_FILENAME']Returns the absolute pathname of the currently executing script
$_SERVER['SERVER_ADMIN']Returns the value given to the SERVER_ADMIN directive in the web server configuration file (if your script runs on a virtual host, it will be the value defined for that virtual host) (such as someone@godaddy.com)
$_SERVER['SERVER_PORT']Returns the port on the server machine being used by the webserver for communication (such as 80)
$_SERVER['SERVER_SIGNATURE']Returns the server version and virtual hostname which are added to server-generated pages
$_SERVER['PATH_TRANSLATED']Returns the file system based path to the current script
$_SERVER['SCRIPT_NAME']Returns the path of the current script
$_SERVER['SCRIPT_URI']Returns the URI of the current page