PHP and regular expressions: return directory URL of a script without the file name

i couldn’t find this through google right away, so i’m keeping it here for reference:

in a php script, i wanted to return the address of the current directory, but remove the file name, extension and additional GET-parameters from the url. here’s what i’ve come up with:

    $scripturl = "http://" . $_SERVER['HTTP_HOST'] . $_SERVER['REQUEST_URI'];
    $scriptpath = eregi_replace('\/[a-z0-9_]*\.php.*', '/', $scripturl);

what the regex code does is look for the last slash in the url (“\/”), then any combination of alphanumeric characters (“[a-z0-9_]*”), followed by the .php file extension (“\.php”) and whatever else there may be in the url (“.*”). the found string is replaced with a single slash (“/”).
i’m sure there’s a better ways to do this, but it’s easy and it works:

example file:



trying to find the right expression, i found this tool very helpful: PHP Regular Expression Tester

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