Part4: Functions in PHP

In this part 4, you'll learn about Functions in PHP. This includes - What is a Function?, How to define and call functions in PHP.

What is a Function?

A Function is a small set of statements defined by the programmer to do a specific action. They take input values in the form of 'arguments' and return values after execution. They can be written anywhere in the program. They are used to reduce the programming complexity and to handle the programming structures easily. The function takes an input, performs some operation with it and returns a value after successful execution. Functions are basically of two types, namely:

Functions with no return value
Functions with return values

How to define & call functions?

Functions are defined using the keyword 'function' followed by the function name. The input parameters are listed in parentheses after the function name, followed by the function code within braces after the arguments