Is it possible to do with .htaccess

lets say i have
And i want that when people open this site, in my server it runs something.php, but do not show to visitor.
What i want that i set to whole dir or even to whole domain, to track IP's who visited and so on.
Right now it is not possible to add in every php file "include ('something.php');".
Is that possible to do with htaccess ?
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php_value auto_prepend_file /path/to/file/

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