Correct link to FP in PHP book site

README.md

@@ -880,7 +880,7 @@ Various resources, such as books, websites and articles, for improving your PHP
 ## PHP Books
 *Fantastic PHP-related books.*
 
-* [Functional Programming in PHP](https://www.phparch.com/books/functional-programming-in-php/) - This book will show you how to leverage these new PHP5.3+ features by understanding functional programming principles
+* [Functional Programming in PHP](http://www.functionalphp.com) - This book will show you how to leverage these new PHP5.3+ features by understanding functional programming principles
 * [Grumpy PHPUnit](https://leanpub.com/grumpy-phpunit) - A book about unit testing with PHPUnit by Chris Hartjes.
 * [Mastering Object-Orientated PHP](http://www.brandonsavage.net) - A book about object-orientated PHP by Brandon Savage.
 * [Modern PHP New Features and Good Practices](http://shop.oreilly.com/product/0636920033868.do) - A book about new PHP features and best practices by Josh Lockhart.