What is the best way to retrieve the filename of the current file in PHP?

To retrieve the filename of the current file in PHP, you can use the `basename()` function along with the `__FILE__` magic constant. `__FILE__` represents the full path and filename of the current file. By passing `__FILE__` to the `basename()` function, you can extract just the filename without the path.

$currentFilename = basename(__FILE__);
echo $currentFilename;