updating php version on mac 10.5.8
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Im trying to run a CMS system on a Macbook version 10.5.8, so pretty old.
The CMS is saying it requires PHP version 5.3.2 or higher. I am wondering how I update the PHP version? I have downloaded the version but do not know what to do with the folder once its unzipped.

Any help would be great, Im more PC than Mac