What do you use for random integers?

Enfernikus · 06-08-2008, 02:36 AM

Well we've all needed to produce random numbers/letters/symbols at one time or another for a salt/temp password or something of the like and I'm curious as to wether y'all use a set function or something else. This is what I use

PHP Code:


			


function generateValue($len = 20){

 $ret = '';

 for($i = 0; $i <= $len;++$i){

   $ret .= chr(0x3 . rand(0,80));

  }

  return $ret;

}

If I wanna go with ONLY digits or letters

[php]

Generally if I want random #'s only I'll just use mktime

delayedinsanity · 06-08-2008, 02:46 AM

Just off the top of my head if I wanted a quick random number, I'd probably just use

PHP Code:


			
echo $szString = str_shuffle(time());
// or for a little more random
echo $szString = str_shuffle(mktime(0, 0, 0, mt_rand(1, 12), mt_rand(1, 30), mt_rand(1980, 2010)));

...but the function I use for random strings looks more like this:

PHP Code:


			
static function generateRandStr ($intLength, $intEncode=0) {

    // Initialize the string
    $szRand = (string) "";

    // Generate a fairly random string
    for ($i = 0; $i < $intLength; $i++) {
        $intRand = mt_rand(0,62);

        // 0 thru 9
        if ($intRand < 10) {
            $szRand .= chr($intRand+48);

        // A thru Z
        } else if( $intRand < 36) {
            $szRand .= chr($intRand+55);

        // a thru z
        } else {
            $szRand .= chr($intRand+61);
        }

    }
  
    // Determine if the string should be hashed
    if ($intEncode == 1) return md5($szRand);
    if ($intEncode == 2) return sha1($szRand);
        return $szRand;

}

Evulness · 06-09-2008, 01:41 PM

i've been using this, its been working fine for helping to create my captcha strings.

Code:

public function EvRandString($length=10, $chrs = '1234567890qwertyuiopasdfghjklzxcvbnm'){
for($i=0; $i<$length; $i++){
    $result .= $chrs{mt_rand(0, strlen($chrs)-1)};
}
return $result;
}

Aaron · 06-09-2008, 04:43 PM

Lemme try to come up with something...

PHP Code:


			
$length = "5";

// Different levels of security
$batch1  = 'AaBbCcDdEeFfGgHhIiJjKkLlMmNnOoPpQqRrSsTtUuVvWwXxYyZz'; // Full Alpha
$batch2 .= '1234567890'; // Numerics
$batch3 .= '!@#$%^&*()_+90-=[]\{}|;:,./<>?';  // Simple symbols, no quotation marks
$batch4 .= '§†↓■«╓≡áíóú█æ¥Ð╗ö╫⌠╞└♦â'; // Ghasp...

// Process
$secureNum = mtrand(1,4);

for ($int=0; $int<$length; $int++){
  switch $secureNum
    case 1:
    $batch1...
... I forgot >.<
}

If anyone could finish that for me that would be sweet, because I totally forgot it.

SpYkE112 · 06-09-2008, 04:50 PM

I just made this one earlier today:

PHP Code:


			
function randStr($len = 32) {
        $str = "";
        
        for($i = 0; $i < $len; $i++)
        {
            $str .= chr(rand(33,126));
        }
        
        return($str);
    }

Which is, full alphabet (upper and lower case), some funny char's and numbers :)

Aaron · 06-09-2008, 04:52 PM

I must really suck at this... You know what!?

PHP Code:


			
$pie = mkrand(0,bazillion);

$pie = md5($pie);
echo "I win!";

xenon · 06-09-2008, 08:46 PM

Not really JUST a random integer generator, but a common one

PHP Code:


			
$hash_table = array_merge(range('a', 'z'), range('A', 'Z'), range(0, 9));
$code_length = 6;
$code = '';

for($i = 0; $i < $code_length; $i++)
{
    shuffle($hash_table);

    $code .= $hash_table[rand(0, count($hash_table) - 1];
}

echo $code;