Flexible method of obtaining file path through __FILE__

// Get the current path of the file + file name
echo __FILE__;
echo '';
// Get the current path of the file
echo dirname(__FILE__);
echo '';
// Get the upper-level directory path of the file
echo dirname(dirname(__FILE__));
?>

Run results: F:mysitewwwindex.php F:mysitewww F:mysite

Remarks: __FILE__, you can get the current path of the file, which will not change even if it is included. It can be used as the absolute path of the website on the server, and other directories will be distributed based on this.