Question

Currently developing a PHP framework and have ran into my first problem. I need to be able to drop the framework into any folder on a server, no matter how many folders deep, and need to find that directory to use as a base URL.

For example, it currently works if I put the framework in the root of the server (http://cms.dev/), but if I were to put it in http://cms.dev/folder/ it does not work.

Answer 1

There are four existing answers, but they all seem to deal with file paths, and you’re asking about a base URL for web requests.

Given any web request, you get a bunch of keys in $_SERVER that may be helpful. For example, in your mock example, you might have the following:

• http://cms.dev/folder/ — $_SERVER['REQUEST_URI'] == /folder/
• http://cms.dev/folder/index.php — $_SERVER['REQUEST_URI'] == /folder/index.php
• http://cms.dev/folder/index.php/some/pathinfo — $_SERVER['REQUEST_URI'] == /folder/index.php/some/pathinfo
• http://cms.dev/folder/some/modrewrite — $_SERVER['REQUEST_URI'] == /folder/some/modrewrite

Thinking critically, how would you pull out the base URL for any given subrequest? In certain cases you can look at $_SERVER['REQUEST_URI'] and strip off trailing elements if you know how deep in your hierarchy the request is. (For example, if your script is two folders deep, strip off the last two path elements.) When PATH_INFO or mod_rewrite are in use, things become less clear: as longer and longer URLs are provided, there is no clear indication where the paths end and the dynamic URL begins.

This is why WordPress, MediaWiki, phpBB, phpMyAdmin, and every application I’ve ever written has the user manually specify a base URL as part of the application configuration.