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Trip-codes

Name: Anonymous 2007-08-15 9:47 ID:rAGjFXj3

What's a good way to generate trip codes like 4chan uses?  Taking the user IP as an argument.

Name: Anonymous 2011-02-07 3:57

<?php
  $ALPHABET = "0123456789!ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz";

function tripcode($ip) {
  $ip = "127.0.0.1";
  $salt = date();
  $crypt = crypt($ip, $salt);
 
  $trip = "";
  for(int i=0; i<strlen($crypt); i++) {
     int idx = ((int) $crypt[i]) % strlen($ALPHABET);
     $trip .= $ALPHABET[idx];
  }

  return $trip;
}
?>

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