Get Directory Path in PHP

$_SERVER['SCRIPT_FILENAME'] --------> directory Path
$_SERVER['HTTP_HOST'] ---------> Domain name
$_SERVER['DOCUMENT_ROOT'] ---------> Document Root
$_SERVER['PHP_SELF'] --------->from root Folder
$_SERVER['REMOTE_ADDR'] ------>IP Address
$_SERVER['HTTP_USER_AGENT'] ---------->User Agent

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