Variable Parameters of Functions in PHP

Let's consider the following code:

php<?php
  function func($num) {
    echo $num * $num;
  }
  
  func(2);
?>

As you can see, when calling the function, the number 2 is passed into it.

It is not necessary to pass a number directly as a function parameter - you can also pass a variable containing the number we need:

php<?php
  function func($num) {
    echo $num * $num;
  }
  
  $param = 2;
  func($param);
?>

Задание 1

Create a function func that will take 3 numbers as a parameter and output their sum. Using this function, output the sum of the values of the following variables:

php<?php
  $param1 = 1;
  $param2 = 2;
  $param3 = 3;
?>