I go to php.net to 'refer' to the large library of functions in their functions list, I find it that since they made php, they would have everything, of which they do, stuff like boolean and whatnot cannot be found on online resources
easily and books, well many people most of the time do not wish to invest in books that won't come in use later.
I for one have an amazing part-time job, and will be checking up on the book you had suggested, and on any others, but til they come, I am stuck with php.net, vB.org and Good ol' filburt

You seem to know alot!