Try Google book. I got 34,300 books from search result: http://www.google.ca/search?hl=en&tbo=1&tbs=bks:1&q=learning+php&aq=f&aqi=g5g-m1&aql=&oq=&gs_rfai= Personally I like this book called "Programming PHP": http://books.google.ca/books?id=tyw...ook_result&ct=result&resnum=1&ved=0CDEQ6AEwAA Rasmus Lerdorf is one of the authors. He is the person who wrote the first version of PHP
I learned from W3schools and PHP.net I have written 15 (and growing) beginners PHP tutorials on my site: dev-network.com/forumdisplay.php?fid=18
www.phpro.org and www.goodphptutorials.com look like good PHP Programmer sites, although as other have said above, just google, there's hundreds of good sites out there.