Built-in Function: strtoupper()
Original text: "Galbi ribs are overrated!"User-defined Function: calculateArea()
The area of my old jail cell with a length of 5 ft and width 3 ft was: 15ft.User-defined Function Example: greetUser()
What's good, Jabba?!Explanation:
Functions in PHP allow us to organize and reuse code.
Built-in functions like strtoupper() convert text to uppercase,
while user-defined functions like calculateArea() and greetUser()
allow us to define custom tasks that can take parameters and return results.