What Are Comparison Operators in PHP | PHP Tutorial | Learn PHP Programming | PHP for Beginners. In this PHP tutorial you will continue to learn about operators. This lesson will cover the type called comparison operators, which are used when we need to compare or check data on a website. With comparison operators we can compare not only integers, but also the other data types we have in PHP. Comparison operators are also used frequently in PHP scripts, which makes it important to learn about them.