生成sessionid和随机密码的例子

用这个可以来验证用户和生成随机密码--teaman

<?

        //----------------------------------------------------

        // 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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