gistfile1.php

<?php
// coords
$destX = 1;
$destY = 1;
$actX = 5;
$actY = 7;

// now go to destination
while(($actX <= $destX || $actX >= $destX) && ($actY <= $destX || $actY >= $destY))
{
	// calc X and Y
	if($actX < $destX)
	{
		$actX++;
	} elseif($actX > $destX)
	{
		$actX--;
	}
	if($actY < $destY)
	{
		$actY++;
	} elseif($actY > $destY)
	{
		$actY--;
	}
	echo 'X: '.$actX.' Y: '.$actY.'<br>';
	if($actX == $destX && $actY == $destY)
	{
		exit();
	}
}