<?
//set width, height and grid size of your map
$width = 200;
$height = 200;
$grid_size = 7;
 
//select how many object will be there on the map
$n = 4;
 
//set X and Y position for each object
$array[0]['x']=1;
$array[0]['y']=1;
 
$array[1]['x']=3;
$array[1]['y']=5;
 
$array[2]['x']=6;
$array[2]['y']=7;
 
$array[3]['x']=0;
$array[3]['y']=0;
 
//Create a new image 
    $image = ImageCreate($width, $height); 
 
//Make 3 new colors, background, grid and block
    $bground = ImageColorAllocate($image, 200, 200, 200);
    $grid = ImageColorAllocate($image, 100, 100, 100);
    $block = ImageColorAllocate($image, 0, 0, 0);
 
//Fill background with background color.
    ImageFill($image, 0, 0, $bground); 
 
//If grid size is not zero, draw grid 
    if($grid_size)
   {
   $step = $grid_size;
 
//Draw horizontal lines
   while($step < $height)
  {
imageline ($image,   0,  $step, $width, $step, $grid);
   $step += $grid_size;
   }
 
  $step = $grid_size;
 
//Draw vertical lines
   while($step < $width)
   {
imageline ($image,   $step,  0, $step, $height, $grid);
$step += $grid_size;
   } 
   }
 
//for each element in array
    for($i=0;$i<$n;$i++)
    {
 
//get X and Y position
   $x1 = $array[$i]['x'];
$y1 = $array[$i]['y'];
 
//if grid is larger then 0 then snap to it
if($grid_size)
{
$x1 = $x1 * $grid_size;
$y1 = $y1 * $grid_size;
}
 
//make thing on mape same size as grid
$x2 = $x1 + $grid_size;
   $y2 = $y1 + $grid_size;
 
//draw it 
    imagefilledrectangle ($image,   $x1,$y1,$x2,$y2, $block);   
 
}
 
//tell the browser that this file act as an image
    header("Content-Type: image/jpeg");
 
//output the image in jpeg format
    ImageJpeg($image);
 
//free up resources
    ImageDestroy($image);
?>

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