If, like Kirby, you know other languages (especially C++, Java, and Perl), then you'll pick up PHP very quickly. However, even if you do, I would suggest any PHP tutorial book by Sams Publishing.
I would not suggest learning PHP directly from reading vBulletin code for several reasons, including you'll make assumptions about coding that may only apply to a specific part of vB, not the entire language. It is, however, a great way to test your knowledge.
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