Functions in PHP

Built-in Function Example

Original Text: Hello, World!

Text in Uppercase: HELLO, WORLD!

User-defined Function Example

Hello, William! Welcome to PHP functions.

Explanation

Functions in PHP are reusable blocks of code that perform specific tasks. Built-in functions, like strtoupper(), are provided by PHP for common operations. User-defined functions are created by developers to encapsulate code logic, making it reusable and easier to manage. Functions can accept parameters and return values.