PHP - $_SERVER

In PHP, the $_SERVER is a superglobal variable that holds information about the server environment, script execution, and request headers. It's an associative array, meaning it uses key-value pairs to access specific information.

The example below shows how to use some of the elements in $_SERVER:

Example

<!DOCTYPE html>
<html>
<body>

<?php
echo $_SERVER['PHP_SELF'];
echo "
";
echo $_SERVER['SERVER_NAME'];
echo "
";
echo $_SERVER['HTTP_HOST'];
echo "
";
echo $_SERVER['HTTP_REFERER'];
echo "
";
echo $_SERVER['HTTP_USER_AGENT'];
echo "
";
echo $_SERVER['SCRIPT_NAME'];
?>

</body>
</html>

Output

/demo/demo_global_server.php 35.194.26.41 35.194.26.41 https://tryphp.codelines.in/showphp.php?filename=demo_global_server Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/121.0.0.0 Safari/537.36 /demo/demo_global_server.php

The following table lists the most important elements that can go inside $_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 (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
$_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['HTTP_ACCEPT']	Returns the Accept header from the current request
$_SERVER['HTTP_HOST']	Returns the Host header from the current request
$_SERVER['HTTPS']	Is the script queried through a secure HTTP protocol
$_SERVER['REMOTE_HOST']	Returns the Host name from where the user is viewing the current page
$_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@codelines.in)
$_SERVER['SCRIPT_NAME']	Returns the path of the current script
$_SERVER['SCRIPT_URI']	Returns the URI of the current page