I haven't had a PHP book since PHP was in version 4, so I don't know much about the books out there, but I would suggest any book that teaches web development with PHP that way you also learn how to use PHP with other tools/languages/programs. And it probably won't hurt a book that uses at least version 5. There is always going to be bad reviews and good reviews, but I won't bother with books that have 2 stars.