Generate An Authentication Code in PHP

This basic snippet will create a random authentication code, or just a random string.

 
?php

# This particular code will generate a random string

# that is 25 charicters long 25 comes from the number

# that is in the for loop

$string = "abcdefghijklmnopqrstuvwxyz0123456789";

for($i=0;$i<25;$i++){

    $pos = rand(0,36);

    $str .= $string{$pos};

}

echo $str;

# If you have a database you can save the string in

# there, and send the user an email with the code in

# it they then can click a link or copy the code

# and you can then verify that that is the correct email

# or verify what ever you want to verify

?>