bottles!

Bottles.php

<?php

class Bottles {

    function verse($num_bottles):string {

        if ($num_bottles == 2) {
            return "2 bottles of beer on the wall, 2 bottles of beer.\nTake one down and pass it around, 1 bottle of beer on the wall.";
        }

        if ($num_bottles == 1) {
            return "1 bottle of beer on the wall, 1 bottle of beer.\nTake it down and pass it around, no more bottles of beer on the wall.";
        }

        if ($num_bottles == 0) {
            return "No more bottles of beer on the wall, no more bottles of beer.\nGo to the store and buy some more, 99 bottles of beer on the wall.";
        }

        $minus_one = $num_bottles - 1;

        return "$num_bottles bottles of beer on the wall, $num_bottles bottles of beer.\nTake one down and pass it around, $minus_one bottles of beer on the wall.";
    }

    function verses($start, $end) {

        $verse_string = "";

        for ($i = $start; $i >= $end; $i--) {
            $verse_string = $verse_string . $this->verse($i);

            if ($i != $end) {
                $verse_string = $verse_string . "\n\n";
            }
        }

        return $verse_string;
    }
}