[HV-Adam]

What is a function ?

A function is a portion of code which performs a specific task and it independent from the rest of the code.

PHP Code:

function add($numberOne, $numberTwo) {
   $sum = $numberOne + $numberTwo;
   return $sum;
} 


This function takes two parameters, $numberOne and $numberTwo. Then assigns $sum to the sum of the two variables. After that we return the variable $sum.

Lets explain each part !

PHP Code:

function add($numberOne, $numberTwo) 


We start a function by using the keyword function. Every function has a name (unless it's a closure, anonymous function, etc, but that's another subject). So the name of our function is add. In our function add we are passing two parameters $numberOne and $numberTwo. This allows us to pass values to our function, you are able to have functions that get passed no values, it would look like this

PHP Code:

 function add() { } 


Next we add the two parameters in and assign it to the variable $sum. This is pretty self explanatory.

PHP Code:

 return $sum; 


This returns the value we assigned to $sum. In the case of this function we could take this value and print it to the screen.

PHP Code:


$add = add(1,1); // Return value is 2
echo $add; // Print 2 to the screen 


Well that's it for this tutorial ! Hope it helps you out !