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Creating random numbers and letters


I am currently trying to build a Registration form but i am stuck on the "security feature"; this is where they look at scramble # and letters and type in the same thing in a form below. They must get this right to register.

I'm stuck on creating this scrambled letters/numbers.

I also want to use this for verification check, so once they register the only way to activate it to go to their e-mail and click on the link ( i believe it should have a scrambled letter/number attached to it.

After registration say they forget their password i want to use the scrambled letter/number to reset their password via e-mail.

Is there any chance someone can show me how to produce scramble letters/numbers

Thanks in advance

creating the captcha could be done via the CI captcha helper:


and creating say a temporary password / registration code can be done using php easy enough.. here is my function i used previously (not in CI) to create a temporary password.

function createRandomPassword() {
        $chars = "abcdefghijklmnopqrstuvwxyz0123456789";
        $i = 0;
        $pass = '';
        while ($i <= 7) {
            $num = rand() % 33;
            $tmp = substr($chars, $num, 1);
            $pass = $pass .$tmp;
        return $pass;

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