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Generating image with random number (anti-bot)

This code generate image, with random generated number (weak and user-annoying anti-bot security :P)

Submitted By: k0b13r
Actions:
Rating:
Views: 7,338

Language: PHP
Last Modified: August 24, 2007

Snippet


  1. <?php
  2.  
  3. function anti_bot($lenght=4)
  4. {
  5. $number = "";
  6. for ($i = 1; $i <= $lenght; $i++)
  7. {
  8.      $number .= rand(0,9)."";
  9. }
  10.  
  11. $width = 11*$lenght;
  12. $height = 30;
  13.  
  14. $img = ImageCreate($width, $height);
  15. $background = imagecolorallocate($img,255,255,255);
  16. $color_black = imagecolorallocate($img,0,0,0);
  17. $color_grey = imagecolorallocate($img,169,169,169);
  18. imagerectangle($img,0, 0,$width-1,$height-1,$color_grey);
  19. imagestring($img, 5, $lenght, 7, $number, $color_black);
  20. imagepng($img);
  21. imagedestroy($img);
  22. }
  23.  
  24. anti_bot();
  25. ?>

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Comments


rjolitz 2008-06-22 20:03:21

I tried this out. Code is easy to follow but this is the output I got:

CODE
‰PNG  &#65533;&#65533;&#65533; IHDR&#65533;&#65533;&#65533;,&#65533;&#65533;&#65533;&#65533;&#65533;&#65533;*X4&#65533;&#65533;&#65533; PLTEÿÿÿ&#65533;&#65533;&#65533;©©©x7Ó^&#65533;&#65533;&#65533;`IDAT•½ÐÑ €0ÐÃô6À}pƒk¢û8SJk»€òõ>ààz 'F-ß›²‡ØìNZ#­âÔŒ´máé*2hÝ»[ œ .Ù>Û23´gö]&#65533;ÿ¸kòôÛëÇ(wúïÐa&#65533;&#65533;&#65533;&#65533;IEND®B`‚
In FireFox 3. Anyone else have this problem?
k0b13r 2008-06-23 12:31:13

You have to send header with content type: header("Content-type: image/png"); before imagepng($img);
balazj 2008-07-31 12:36:19

I have problem with this code. I have tag : Now instead normal page with image, i have new page with ONLY image that generates Your code. Any idea?

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