Comments

• Richard

  posted 28 April 2005

  Anti spam hint:
  
  
  session_start();
  
  // generate 5 digit random number
  $rand = rand(10000, 99999);
  
  // create the hash for the random number and put it in the session
  $_SESSION['image_random_value'] = md5($rand);
  
  // create the image
  $image = imagecreate(60, 30);
  
  // use white as the background image
  $bgColor = imagecolorallocate ($image, 255, 255, 255);
  
  // the text color is black
  $textColor = imagecolorallocate ($image, 0, 0, 0);
  
  // write the random number
  imagestring ($image, 5, 5, 8, $rand, $textColor);
  
  // send several headers to make sure the image is not cached
  // taken directly from the PHP Manual
  
  // Date in the past
  header("Expires: Mon, 26 Jul 1997 05:00:00 GMT");
  
  // always modified
  header("Last-Modified: " . gmdate("D, d M Y H:i:s") . " GMT");
  
  // HTTP/1.1
  header("Cache-Control: no-store, no-cache, must-revalidate");
  header("Cache-Control: post-check=0, pre-check=0", false);
  
  // HTTP/1.0
  header("Pragma: no-cache");
  
  
  // send the content type header so the image is displayed properly
  header('Content-type: image/jpeg');
  
  // send the image to the browser
  imagejpeg($image);
  
  // destroy the image to free up the memory
  imagedestroy($image);
  

• Laurie

  posted 28 April 2005

  Thank you, but please phrase your answer in the form of a plugin to MoveableType ;-) *My* blog doesn't get spam...

• Richard

  posted 28 April 2005

  Ha!
  
  You deserve everything you get! ;) MT is *SUCH* a laugh