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Old 11-03-2007, 11:36 AM   · #1
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Random Passwords
Got a tad bored today, so wrote a function for random passwords. Maybe it will help someone.

PHP Code:
<?php

/**
* Generate a random password.
*
* @param  integer  $numchars      How long do we need the password to be?
* @param  boolean  $specialchars  Include the special characters?
* @param  boolean  $extrashuffle  Include an extra randomization on the password string?
* @return string
*/
function random_pass($numchars = 8, $specialchars = true, $extrashuffle = false)
{
    $numchars = intval($numchars);
    $numchars = ($numchars > 16 OR $numchars < 8) ? 8 : $numchars;

    $chars = array_merge(range('a', 'z'), range(0, 9));

    if ($specialchars)
    {
        $chars = array_merge($chars, array('!', '$', '_', '-', '#', '@'));
    }
    shuffle($chars);

    $pass = '';

    for ($i = 0; $i <= $numchars; $i++)
    {
        $pass .= $chars[$i];
    }

    if ($extrashuffle)
    {
        return str_shuffle($pass);
    }
    return $pass;
}

// Example, returns: 3ck#4sib2
echo random_pass(8, true, true);

?>


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Old 11-03-2007, 12:31 PM   · #2
Daniel
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PHP Code:
<?php

/**
* Generate a random password.
*
* @param  integer  $numchars      How long do we need the password to be?
* @param  boolean  $specialchars  Include the special characters?
* @param  boolean  $extrashuffle  Include an extra randomization on the password string?
* @param  boolean  $mixedcase     Mixed case or solely lowercase?
* @return string
*/
function random_pass($numchars = 8, $specialchars = true, $extrashuffle = false, $mixedcase = true)
{
    $numchars = intval($numchars);
    $numchars = ($numchars > 16 OR $numchars < 8) ? 8 : $numchars;
    
    $chars = array_merge(range('a', 'z'), range(0, 9));

    if ($mixedcase) /* Extra case */
    {
        $chars = array_merge($chars, range('A','Z'));
    }
    
    if ($specialchars)
    {
        $chars = array_merge($chars, array('!', '$', '_', '-', '#', '@'));
    }
    shuffle($chars);

    $pass = '';

    for ($i = 0; $i < $numchars; $i++) /* Changed to < only sign, otherwise it would be 1 character longer than needed */
    {
        $pass .= $chars[$i];
        shuffle($chars); /* Get repeated characters, would add as an option, but I'm lazy */
    }

    if ($extrashuffle)
    {
        return str_shuffle($pass);
    }
    return $pass;
}

// Example, returns: 3ck#4si2
echo random_pass(8, true, true, true);

?>


Added an extra shuffle after each character, so you can get repeated characters too. (I prefer it that way).
Added MiXeD case option
Fixed the length ($i = 0; $i <=$numchars) part.
Last edited by Danltn : 11-03-2007 at 12:36 PM.
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Old 11-04-2007, 09:22 AM   · #3
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Both good, but heres a function I made a while ago and have been using, it may not be as customizable, but the passwords are very difficult to guess:
PHP Code:
<?php
function prand($len = 10){
     $pass = '';
     for($i = 0; $i < $len; $i ++){
          $pass .= chr(rand(33, 126));
     }
     return $pass;
}

echo prand();
?>
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Old 02-05-2008, 03:42 PM   · #4
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i had to go for the smallest one

PHP Code:
function randomPassword($length = 8) {
    return    substr(base64_encode(md5(time())), 0, $length);
}



creates random string of A–Z, a–z, and 0–9 of max of 42ish chars
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Old 02-18-2008, 05:53 PM   · #5
unknowngiver
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Originally Posted by jimmysanders
i had to go for the smallest one

PHP Code:
function randomPassword($length = 8) {
    return    substr(base64_encode(md5(time())), 0, $length);
}



creates random string of A–Z, a–z, and 0–9 of max of 42ish chars


lol protection much...base64 and md5 encryption lol
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Old 02-19-2008, 02:24 AM   · #6
Daniel
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Originally Posted by unknowngiver
Originally Posted by jimmysanders
i had to go for the smallest one

PHP Code:
function randomPassword($length = 8) {
    return    substr(base64_encode(md5(time())), 0, $length);
}



creates random string of A–Z, a–z, and 0–9 of max of 42ish chars


lol protection much...base64 and md5 encryption lol



Not very secure, if you knew say what time roughly they made it, and how long, it could easily be cracked.

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