<? 
   
  $imagekod = ''; 
   
  for ($i = 0; $i < 8; $i++) { 
   
  $imagekod .= chr(mt_rand(100,120)); 
  $imagekod=strtoupper($imagekod); 
  } 
  // set up image 
  $height = 30; 
  $width = 100; 
  $im = ImageCreate($width, $height); 
  $white = ImageColorAllocate ($im, 255, 255, 255); 
  $black = ImageColorAllocate ($im, 128, 0, 0); 
   
  // draw on image 
  ImageFill($im, 0, 0, $black); 
  // ImageLine($im, 0, 0, $width, $height, $white); 
  ImageString($im, 300, 15, 10, $imagekod, $white); 
   
  // output image 
  Header ("Content-type: image/png"); 
  ImagePng ($im); 
   
  // clean up 
  ImageDestroy($im); 
   
  ?>