Creating a php file in PHP

I'm working on an installer for a project of mine and the installer will create a configuration file.

I have it working 99.99% fine, but in that file i want a check to ensure a hacking can't access it directly, and that code uses the $_SERVER super global, which in every run, gets parsed by php so it breaks the logic I'm trying to go for.

does anyone know I can get the superglobal to stay intact as it is without it parsing or should i rethink my logic and add it elsewhere?

for those who may want to see the code, here it is:

#Disable direct access.
if(!strcasecmp(basename($_SERVER['SCRIPT_NAME']),basename(__FILE__)) || !defined('accessed')){
    die('<string>No Direct access is allowed for this file.</string>');
}

Solution

Assuming you are using Apache (or any .htaccess compatible server), you just have to create a .htaccess file in the folder holding your configuration file, containing the following:

<Files config.php>
  deny from all
</Files>

It will prevent any access to this file through an HTTP request.

See using .htaccess files for details.