Which way to get the PHP self script name is the fastest?

From the WebDevLogs.com blog today, there's some benchmarking results from Mgcci's look at PHP's methods for grabbing some common data the script's own name. This includes the magic call to __FILE__: The result shows that __FILE__ is the fastest, so use that when you don't have to use any other method to find the script's self. __FILE__ is a built in constant show the location of the running script.

__FILE__;0.000740
$_SERVER["PHP_SELF"];0.001425
$_SERVER["SCRIPT_NAME"];0.001496
$_SERVER["REQUEST_URI"];0.001509
getenv("REQUEST_URI");0.003845
getenv("SCRIPT_NAME");0.003519
getenv("SCRIPT_URL");0.003480