Count Without Loops

Problem: write a program to display number from 1-10 without using any looping statements (for, while, do) and only using one parameter.

Input:

10

Output:

1
2
3
4
5
6
7
8
9
10

Solution:

<?php
    $rec = new Recursion;
    $rec->display(10);
    
    class Recursion
    {
        public function display($num)
        {
            if($num > 0)
            {
                $this->display($num-1);
                echo $num.'<br>';
            }
        }
    }
?>