Examples of functions and server variables for PHP to obtain the current url path

$path = /var/www/../ect/abcd;
echo $_SERVER['DOCUMENT_ROOT'].""; //Get the server document root variable ( Depends on the configuration in http.conf)
echo $_SERVER['PHP_SELF'].""; //Get the path to the file that executes the code, which is related to the configuration in http.conf.
echo __FILE__.""; //Variable to get the file system absolute path of the file
echo dirname(__FILE__); //Function to get the path of the folder where the file is located
echo realpath($pah);
? >

Output results:

/var/www/htdocs/ /alias/aa.php /var/www/htdocs/kamap/aa.php /var/www/htdocs/kamap/ /usr/etc/abcd