Important PHP elements and codes that can be used with $_SERVER super global variable

$_SERVER is a PHP super global variable which holds information about headers, paths, and script locations. Below are some elements that can be used with $_SERVER to get effective results.

The example below shows the example elements that can be used with $_SERVER in the following form:

echo $_SERVER['PHP_SELF']; //Returns the path and filename of the current script

More elements and their use:

SERVER_PROTOCOL Returns the name and revision of the page-requested protocol
REQUEST_METHOD Returns the request method used to access the page
REQUEST_TIME Returns the timestamp from the beginning of the request
DOCUMENT_ROOT Returns the root directory of the current script
HTTP_REFERER Returns the page address that referred to the current page
HTTP_USER_AGENT Returns the user agent of the header from the current request
REMOTE_ADDR Returns the IP address of the current user
REMOTE_PORT Returns the port of the user’s machine that is accessing the page
SCRIPT_FILENAME Returns the absolute filename from the current script
SCRIPT_NAME Returns the path of the current script

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