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  • 2 weeks later...

Apologies for the delayed reply; I was on vacation! Thanks for your question and interest in the book. The fourth edition was a really heavy rewrite of the 3rd edition; the fifth edition is a fairly mild update: Fixed all the bugs; made everything up-to-date for the current standards, PHP 7, etc.; moved the appendix back into the printed edition, but lost Chapter 19 accordingly; added a bit more security. It covers the same OOP as the 4th and I'm pretty sure both cover PDO for MySQL. 

If you have the 4th edition, you may not benefit that much from the 5th (maybe look at "What's new in PHP 7" instead). 

Thanks again!

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