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| Submitted on: 11/6/2000 9:33:44 AM
By: Benoit Gauthier
Level: Beginner
User Rating:
By 2 Users
Compatibility:PHP 3.0, PHP 4.0
Users have accessed this code 6678 times.
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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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1) You may use
this code in your own programs (and may compile it into a program and distribute it in compiled format for languages that allow it) freely and with no charge.
2) You MAY NOT redistribute this code (for example to a web site) without written permission from the original author. Failure to do so is a violation of copyright laws.
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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 fo
// r the string default =24
//
// Returns:A string with the random cara
// cters in it.
//
// Assumes:Uses PHP.
//
//This code is copyrighted and has // limited warranties.Please see http://
// www.Planet-Source-Code.com/xq/ASP/txtCod
// eId.225/lngWId.8/qx/vb/scripts/ShowCode.
// htm //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 |
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
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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 <?session_start();?><?=SID?> and
have the EXACT SAME RESULT!!! Learn PHP
Ian so you can maintain some integrity
on your web site!
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