Security is a big topic. I mean *really* big. If you break it down into little chunks, there's lots of important bits to pay attention to but it all really starts with the application. Without good secure coding practices, your application could be doomed from the start. We as PHP developers have had trouble in the past integrating these practices into our day to day development. This book walks you through some of the most common terms and practices, giving you a better picture of the whole of application security.
If you're a beginner, this book will be too cryptic for you. If you're a senior, you'll learn next to nothing from it.
It's only useful for intermediate devs, and even that just barely.
The book is a pitiful 60 pages full of errors, typos, missing examples and bugged code embeds. Add to that the $20 price tag (I'd have a hard time recommending it even if it were $5) and the fact that it reads like a badly compiled set of Wikipedia articles on known security acronyms and aspects, along with the unfortunate fact that it has little if anything to do with PHP itself (20 lines of PHP in total, if that), I cannot recommend this book to anyone.
If you get it for free somehow, sure, storm through it and pick up some of the lesser aspects, you're likely bound to find a couple, but I wouldn't recommend purchasing it. It's just another in a long line of bad Leanpub releases.
Un buon manuale introduttivo sui concetti basilari della sicurezza nelle applicazioni PHP.
Molte informazioni si trovano su Internet, e aglil sviluppatori un po' più esperti apparirà abbastanza banale, ma può essere utile come piccola guida da tenere sottomano per verificare che la propria applicazione sia "conforme".