$_SERVER
$_SERVER is a superglobal variable which holds the data about the headers, script locations, network addresses, paths, etc.
Example:
<?php
echo $_SERVER['PHP_SELF'] . '<br>';
echo $_SERVER['DOCUMENT_ROOT'] . '<br>';
echo $_SERVER['SERVER_ADDR'] . '<br>';
echo $_SERVER['SERVER_NAME'] . '<br>';
echo $_SERVER['REQUEST_METHOD'] . '<br>';
echo $_SERVER['REQUEST_TIME'] . '<br>';
echo $_SERVER['HTTP_USER_AGENT'] . '<br>';
echo $_SERVER['REMOTE_ADDR'];
?>The following table lists some of the important elements of $_SERVER:
| Element/Code | Description |
|---|---|
$_SERVER['PHP_SELF'] |
Returns the filename of the currently executing script |
$_SERVER['GATEWAY_INTERFACE'] |
Returns the version of the Common Gateway Interface 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 |
$_SERVER['SERVER_SOFTWARE'] |
Returns the server identification string |
$_SERVER['SERVER_PROTOCOL'] |
Returns the name and revision of the information protocol |
$_SERVER['REQUEST_METHOD'] |
Returns the request method used to access the page |
$_SERVER['REQUEST_TIME'] |
Returns the timestamp of the start of the request |
$_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 |
$_SERVER['HTTP_HOST'] |
Returns the Host header from the current request |
$_SERVER['HTTP_REFERER'] |
Returns the complete URL of the current page |
$_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 web server |
$_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 |
$_SERVER['SERVER_PORT'] |
Returns the port on the server machine being used by the web server for communication |
$_SERVER['SERVER_SIGNATURE'] |
Returns the server version and virtual host name 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 |