The most recognized minor version of PHP 5, in the last few years, is PHP 5.3, which has been widely accepted and is used currently. After PHP 5.3, two other minor versions of PHP, PHP 5.4, and PHP 5.5, have been released. Though a lot of hosting providers are still sticking with PHP 5.3, a few providers have started updating their PHP version to PHP 5.4. For users who do not depend on hosting providers, we can use the current version of PHP, PHP 5.5. There are a vast number of resources in books and on the Internet discussing the features of PHP 5.2 and 5.3, and very few resources discussing PHP 5.4 and 5.5. We will begin this chapter by learning a few new features that have been shipped out with PHP 5.4 and PHP 5.5.