PHP (Hypertext Preprocessor) is a scripting language that is frequently used in open-source applications and is especially ideal for web development. It includes a slew of built-in functionalities that make it easy for developers to do a variety of jobs. In this guide, we'll look at some of PHP's essential capabilities and highlight key built-in functions that novices should be aware of. PHP, like all programming languages, relies on functions. You will learn how to create and use pre-existing and customised PHP functions.