i'm looking to a book for learning PHP .
i'm founded "PHP and MySQL develop 4th Edition" by Luke Welling
but it publish in 2009 ( PHP 5.2 ). And now PHP version are 5.4 and it has much improve so much.
My guess is that there probably are not any really good books out yet, as the usual lag time for any decent publication is at least a year. You're probably more likely to find useful info about 5.4 on the web (including the php.net site!), which you can layer on top of whatever relatively recent PHP 5.x book you find that you like.
"Please give us a simple answer, so that we don't have to think, because if we think, we might find answers that don't fit the way we want the world to be."
~ Terry Pratchett in Nation