I want to put two ore more images together (in a line) using php. How can I do that?

You don't need php to do this. In fact this is really simple html.

<img src="someImage.jpg" alt="" /><img src="someImage2.jpg" alt="" />

That would be extremely easy, but I need to make it a big image. I was playing with imagecopymerge but could not find a way to put images one next to another. I will have 5 images to put one next to another and one under these.

Why do you exactly need the combined images to become one image. Is there benefits with the single image rather than the multiple images via html?

Are the images the same height?

If so:

PHP Code:

function appendRight($in){
  $total = 0;
  foreach($in as $img){ $total += imagesx($img); }
  $out = imagecreatetruecolor($total,imagesy($in[0]));

  $x = 0;
  foreach($in as $img){
    imagecopy($out,$img,$x,0,0,0,imagesx($img),imagesy($img));
    $x += imagesx($img);
  }

  return $out;
} 


$in being an array with imagehandlers.