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| Submitted on: |
11/6/2000 9:33:44 AM |
| By: |
Benoit Gauthier
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| Level: |
Beginner |
| User Rating: |
By 5 Users |
| Compatibility: |
PHP 3.0, PHP 4.0 |
| Views: |
26545 |
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Generate a random string of caracters to use for identifying your users on your web site. Can also be used to generate passwords.
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//**************************************
// for :Session ID
//**************************************
No Copyrights, use as is. | |
code:
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//**************************************
// Name: Session ID
// Description:Generate a random string of caracters to use for identifying your users on your web site. Can also be used to generate passwords.
// By: Benoit Gauthier
//
// Inputs:nSize , number of caracters for the string default =24
//
// Returns:A string with the random caracters in it.
//
// Assumes:Uses PHP.
//
//This code is copyrighted and has// limited warranties.Please see http://www.Planet-Source-Code.com/vb/scripts/ShowCode.asp?txtCodeId=225&lngWId=8//for details.//**************************************
<?
//----------------------------------------------------
// Function GetSID()
//
// Parameters : $nSize number of caracters, default 24
// Return value : 24 caracters string
//
// Description : This function returns a random string
// of 24 caracters that can be used to identify users
// on your web site in a more secure way. You can also
// use this function to generate passwords.
//----------------------------------------------------
function GetSID ($nSize=24) {
// Randomize
mt_srand ((double) microtime() * 1000000);
for ($i=1; $i<=$nSize; $i++) {
// if you wish to add numbers in your string,
// uncomment the two lines that are commented
// in the if statement
$nRandom = mt_rand(1,30);
if ($nRandom <= 10) {
// Uppercase letters
$sessionID .= chr(mt_rand(65,90));
// } elseif ($nRandom <= 20) {
// $sessionID .= mt_rand(0,9);
} else {
// Lowercase letters
$sessionID .= chr(mt_rand(97,122));
}
}
return $sessionID;
}
// Test the function
echo GetSID(16);
?>
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Other User Comments
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 12/29/2000 1:47:12 AM: John Lim
I like the code but I have some issues.
1. The only randomness comes from the initial random seed. It is really necessary to call mt_rand so many times? Why not return the first mt_rand? There is nothing random about calling mt_rand multiple times if the seed does not change. You need to set the seed again within the loop to make it more random.
2. On a multi-processor system, it is possible that 2 people be given the same id.
A possible improvement is to add to the random number seed the ip number of the client.
Bye, John
(If this comment was disrespectful, please report it.)
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10/30/2001 4:59:12 AM: bawy
Umm, this is the most pointless 5 million lines of code, you could just write and have the EXACT SAME RESULT!!! Learn PHP Ian so you can maintain some integrity on your web site!
(If this comment was disrespectful, please report it.)
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