Image Gallery Help (for a newb)

[thegreenestday]

Hey,
Im a newb to php so I can hardly write anything on my own. I am trying to write a script that automatically makes a gallery page for me but I can't do it!

I want to make a table with 3 pictures a row with all the images in a given directory. The I want each image to be a link to the full-size image in a popup window. I have this so far:

   $gallery = "encrucijadas";
   $dir = dir("/bbtest/images/galleries/$gallery/large");

   while($file = $dir->read())
   {
      if (ereg(".*\.jpg$", $file))
      {
      	$image = "/bbtest/images/galleries/$gallery/large/$file";
      	$size = GetImageSize($image);
      	$width = $size[0];
      	$height = $size[1];

  	$imagethumb = "/bbtest/images/galleries/$gallery/thumbnails/$file";
  	$sizethumb = GetImageSize($imagethumb);
  	$widththumb = $size[0];
  	$heightthumb = $size[1];

So now I have the thumbnails image sizes and the full size images too (for the popup). Now I want to somehow make it display this, but repeating till all the images are displayed:

      		echo "<td align =\"center\">\n";
      		echo "<a href='#' onclick=\"window.open('popup.php?img=$image','width=$width,height=$height,
directories=no,location=no,menubar=no,scrollbars=no,status=no,
toolbar=no,resizable=no');return false\" target=\"_blank\">";
      		echo "<img src\"../images/galleries/$gallery/thumbnails/$file\" alt=\"$file\" width=\"$widththumb\" height=\"$heightthumb\" border=\"0\">";
      		echo "</a>\n";
      		echo "</td>";

Obviously all that should go within the <tr> tags but the previous code should loop 3 times (with the next image each time) before closing the <tr>. To see what I mean go to http://www.photographyasartgallery.com/bbtest/galleries/encrucijadas_1.php and click on the first image (ignore the stuff at the top).
I hope you understand what I'm saying.
Thanks!

BTW if you don't understand my question tell me and I'll try to explain again.

[diego25]

Keep a counter, and once the counter reaches a multiple of 3 output the <tr> tag (and remember to close the previous <tr> if needed). So, for example, your counter starts at 0, and you'd output a <tr> when the counter reaches 3, 6, 9, etc.

To check if the counter is at a multiple of 3, you can use the mod operator %. That returns the remainder of a division. All the multiples of 3, divided by 3 will have a remainder of 0, so that's how you detect them.

i.e.

if ($counter % 3 == 0) {
print "</tr><tr>";
}

Diego