PHP Functions Demonstration

Example of a Built-in Function:

strtoupper("hello, world!"): HELLO, WORLD!

Example of a User-defined Function:

greetUser("shoua"): Hello, Shoua!

Explanation:

Functions in PHP are reusable blocks of code that perform specific tasks. Built-in functions like strtoupper() are provided by PHP to handle common tasks like . User-defined functions allow developers to create their own reusable logic, improving code organization and efficiency.