PHP gets the code of the current URL and domain name

echo SERVER['SERVER_NAME'];//Get the source URL, that is, click to go to the previous page URL of this page
echo SERVER["HTTP_REFERER"];
SERVER['REQUEST_URI']; //Get the suffix of the current domain name
SERVER['HTTP_HOST'];//Get the current domain name
dirname(__FILE__);//Get the physical path of the current file
dirname(__FILE__)."/../";//Get The upper level physical path of the current file
?>

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