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nsaneforums

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Jan 6th, 2019
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  1. <?php
  2. // EXAMPLE USAGE
  3. $array = generate();
  4. echo $array[0];
  5. echo "<br />";
  6. echo $array[1];
  7.  
  8.  
  9. // FUNCTION
  10. function generate()
  11. {
  12. $digilist = "0123456789ABCDEFGHJKLMNPQRTUVWXY";
  13.  
  14. //now we generate a new random ID number using the substrings of the digitList string above
  15. $id = NULL;
  16. $id .= substr($digilist, rand(1, 9), 1); //random number
  17. $id .= substr($digilist, rand(10, 31), 1); //then a letter
  18. $id .= substr($digilist, rand(10, 31), 1); //another letter
  19. $id .= substr($digilist, rand(1, 9), 1); //a number
  20. $id .= substr($digilist, rand(1, 9), 1); //and finally another number - simple :D
  21.  
  22. //ok so now we need to generate an MD5 hash of our ID
  23. $hash = md5($id);
  24.  
  25. //cycle through the hash 16 (length of key) times (in steps of 2 because each hex bytes is 2 digits long)
  26. $i = 0;
  27. $key = NULL;
  28. for ($i; $i < 32; $i+=2)
  29. {
  30. //here we convert the next hex value to an integer and perform a bitwise AND operation against '31'
  31. //31 is the highest substring value in our digit list.
  32. $nextdigit = hexdec(substr($hash, $i, 2)) & 31;
  33.  
  34. //if 'i' is divisable by 8 (every 4 cycles) then we want to add "-"
  35. if ((($i % 8) == 0) && ($i > 0))
  36. {
  37. $key .= "-".substr($digilist, $nextdigit, 1);
  38. }
  39. else
  40. {
  41. $key .= substr($digilist, $nextdigit, 1);
  42. }
  43. }
  44.  
  45. $array = array($id, $key);
  46. //return
  47. return $array;
  48. }
  49. ?>
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