[Solved] if (basename(__FILE__) == xxx.php)… Stops Working When Included?

__FILE__ always returns the file name where it is. If used inside an include, the name of the included file is returned.

So if the code is in number.php, then __FILE__ will be number.php.

You could use $_SERVER['PHP_SELF'] instead, which returns the filename of the currently executing script, relative to the document root.