This is a very basic script that generates a string 25 characters long using the characters listed in $string. You can modify the length of the string by changing the 25 in the for() statement to the length you desire.
<?php $string = "abcdefghijklmnopqrstuvwxyz0123456789"; //List usable characters for($i=0;$i<25;$i++){ //Repeat 25 times $pos = rand(0,36); //We have 37 characters in our $string so we take a random one between 0 and 36 $str .= $string{$pos}; //Add the randomly selected character to our output variable } echo $str; //Print our randomly generated string ?>
The code outputs:
2d2c3vceidd1xk1zhqhkjsey2
Refresh the page to see another randomly generated string.
This code can be used to create a random login ticket to ensure the user is authenticated or can be used as a salt to a password when encrypting. The following is an example of this.
<?php $RawPassword = "password"; //Store the users raw unedited password $string = "abcdefghijklmnopqrstuvwxyz0123456789"; for($i=0;$i<10;$i++){ $pos = rand(0,36); $salt .= $string{$pos}; //Store the salt to the $salt variable } $SaltedPassword = sha1(RawPassword,$salt); //Hash the password using SHA1 encryption and the $salt echo "Salted Password: ".$SaltedPassword; //Save the password to the database, or in this case, print the result. echo "<br>Salt: ".$salt; echo "<br>Raw Password: ".$RawPassword; ?>
The code outputs:
Salted Password: P{-^’ {puM
Salt: 9n2yobqs3t
Raw Password: password
