If server doesn't have mod rewrite

I have a question regarding mod_rewrite. I know in htaccess I can do the <IfModule>, but what about开发者_如何学运维 in PHP? In html I am writing out my links like projects/24 which really is action=projects&id=24. If the server someone installs this app on doesn't have mod_rewrite, how in PHP do I change the links to just GET vars?

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use apache_get_modules()

Edit: I'm not sure which handicap voted down the correct answer, but he apparently can't rtm.

Here is some code to illustrate:

<?php

if (in_array("mod_rewrite", apache_get_modules())) {
   echo 'has rewrite';
} else {
   echo 'no rewrite';
}

?>

Use this to decide which kind of link you want to write.

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how in PHP do I change the links to just GET vars?

Just make your all your links using variables.
And choose their appearance based on the some configuration setting, like Wordpress does.

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There are workarounds using ErrorDocument and handling the failed requests in userland (= php script). But this will (1) pollute the log, and (2) does not work with POST requests (depending on server). Wouldn't bother with that.

A practical alternative is utilizing PATH_INFO for clean urls in combination with one or multiple root scripts. You will need to use it with e.g. +MultiViews or SetHandler or DefaultType and ForceType (which can be used to plant a php script sans extension). ^[1]
But oftentimes those are disallowed directives too, if not even mod_rewrite is enabled.

_{[1] Don't forget a FilesMatch section to limit the effect, or disable it in subdirectories again.}

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I'm not sure exactly what you're going to end up with, but this might push you in the right direction:

http://www.tutorio.com/tutorial/php-alternative-to-mod-rewrite-for-se-friendly-urls

There are of course other problems with this, the biggest being problems caching and indexing these sorts of URLs in search engines.