Tower of Hanoi in PHP

<?php


function moveTower($height, $fromTower, $toTower, $viaTower)
{
	echo $height  . "<br>";
	if ($height >= 1)
	{	
		moveTower($height-1, $fromTower, $viaTower, $toTower);
		moveDisk($fromTower, $toTower);
		moveTower($height-1, $viaTower, $toTower,  $fromTower);
	}
	else
	{
		//moveDisk($fromTower, $toTower);
	}
	
}

function moveDisk($a, $b)
{
	echo "Moving disk from" . $a . " to " . $b . "<br>";
}


moveTower(3, 'A','B','C');
exit;