Fibonacci number

core/function/fibonacci-number/code/src/fibonacci-number.php:

<?php

function fibonacci($number)
{
  // TODO
}

core/function/fibonacci-number/code/print/fibonacci-number.print.php:

<?php

require __DIR__ . '/../src/fibonacci-number.php';

// Fibonacci series

// making the 0th number
var_dump(fibonacci(0));
var_dump(null);

// making the 1st numbers
var_dump(fibonacci(1));
var_dump(0);

// making the 2nd numbers
var_dump(fibonacci(2));
var_dump(1);

// making the 4th numbers
var_dump(fibonacci(4));
var_dump(2);

// making the 6th numbers
var_dump(fibonacci(6));
var_dump(5);

Response