So, I found this quite a while ago and decided I would share it in case other people haven't found it yet.

Basically, it is a full offline PHP documentation (basically, you are downloading everything PHP.net has to offer). It comes with installation guides, security, features, extras, and of course the full PHP function index consisting of pretty much every PHP function in existence and a guide/examples on how to use them.

I hope someone may find this as helpful as I did. Now you can learn and practice PHP anywhere you have your laptop without the need for an internet connection.

Total file size is about: 40 - 50MB after extraction.

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Here is the link to the download page for the documentation:
http://www.php.net/download-docs.php

Select what you language you want to download in. I recommend selecting the tar.gz for your language as it contains multiple HTML files which are used for easier navigation and faster browsing as the browser doesn't have to load the entire documentation in one file.

After you select your language, select a download mirror and download the file. Once downloaded, extract it. You may have to extract twice depending on what extraction software your using.

If this is the case, first extract the .tar.gz file, then when the .tar pops out, extract that one to get the actual files.

Enjoy!