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I'm a beginner using PHP, and I have downloaded a patch from http://www.php.net and it's called 4.2.1-to-4.2.2.patch or something like that. How do I install the patch? It's not a exe file, and it's not a .bat file. I don't know how to do.
It'll probably be easier just to download the latest version and install that instead of applying the patch. You can easily install one version of PHP over another, just follow the steps in the installation guide.