Re: [PHP] Password generator

[Davy Obdam]

Thanks Lars and ofcourse all the other people who answerd.

It works great!!

Best regards,

Davy Obdam

Lars Torben Wilson wrote:

On Tue, 2003-06-17 at 02:45, Davy Obdam wrote:
 

Hi people,

I have to make a password generator, but i have a little problem.

- It needs to generate password 8 characters long, and including 1 or 2 
special characters(like #$%&*@).
- Those special characters can never appear as the first or last 
character in the string... anywhere between is fine.

I have a password generator script now that does the first thing... but 
the special character can be in front or back of the string wich it 
shouldnt.. i have been looking on the web for this but i havent found 
the answer. Below is my scripts so far.. 

Any help is appreciated, thanks for your time,

Best regards,

Davy Obdam
   

Please don't crosspost. Pick the suitable list (in this case, it would
have been php-general).
Anyway, just tell it not to use anything beyone the first 26 characters
of your allowable characters string. Below is one way to do it.
Good luck,

Torben

<?php
error_reporting(E_ALL);
ini_set('display_errors', true);
// A function to generate random alphanumeric passwords in PHP
// It expects to be passed a desired password length, but it
// none is passed the default is set to 8 (you can change this)
function generate_password($length = 8) {
  // This variable contains the list of allowable characters
  // for the password.  Note that the number 0 and the letter
  // 'O' have been removed to avoid confusion between the two.
  // The same is true of 'I' and 1
  $allowable_characters =
'abcdefghefghijklmnopqrstuvwxyz0123456789%#*&';
    
  // We see how many characters are in the allowable list
  $ps_len = strlen($allowable_characters);

  // Max index of the characters allowed to stand and end the output.
  $max_endpoint_ind = 25;
  // 0-based index of the last char of the output
  $last_char = $length - 1;
  // Seed the random number generator with the microtime stamp
  // (current UNIX timestamp, but in microseconds)
  mt_srand((double)microtime() * 1000000);
  // Declare the password as a blank string.
  $pass = "";
  // Loop the number of times specified by $length
  for($i = 0; $i < $length; $i++) {
      // Each iteration, pick a random character from the
      // allowable string and append it to the password.
      switch ($i) {
      case 0:
      case $last_char:
          $pass .= $allowable_characters{mt_rand(0,
$max_endpoint_ind)};
          break;
      default:
          $pass .= $allowable_characters{mt_rand(0, $ps_len)};
      }
  }
  // Retun the password we've selected
  return $pass;
}
for ($i = 0; $i < 100; $i++) {
   echo generate_password() . "\n";
}
?>

 

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Davy Obdam 
Web application developer

Networking4all
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