PHP 5.4 is so last year. We will cover the best features and additions in PHP 5.5. You can look forward to the following:
Support for generators (http://www.php.net/manual/en/language.generators.php) has been added via the yield keyword Usage of the new finally keyword in try-catch blocks An overview and examples of the new password hashing API The foreach control structure now supports unpacking nested arrays into separate variables via the list() construct empty() supports arbitrary expressions such as closures returning false array and string literal dereferencing The Zend Optimiser+ opcode cache (via the new OPcache extension) Not only that, but the MySQL extension as you know it has been deprecated. You're now forced to use either mysqli or PDO.