Will I suffer if I learn PHP4 compared to PHP5?

I'm a little interested into delving into PHP, and picked up a book from my library to learn more about it. However, the book covers PHP4 (Library doesn't keep up with the times...), and I know PHP5 is the current standard.Will a PHP4 book teach me things that are depreciated, useless, or just plain wrong? Or could I learn sufficiently enough to be able to jump into PHP5 with no problems?
 
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