Creating a mechanism to validate emails

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The easiest way is not to register unverified users at all.

Ask them for an email address and send email with a link that contains this address sealed with a hash. Upon receiving this link you can start the registration process.

Something like this

$secret = "35onoi2=-7#%g03kl";
$email = urlencode($_POST['email']);
$hash = MD5($_POST['email'].$secret);
$link = "http://example.com/register.php?email=$email&hash=$hash";

And in your register.php add 2 hidden fields to the registration form – email and hash, storing their received values from GET.

Finally, process registration and check,

if (md5($_POST['email'].$secret) == $_POST['hash']) {
    //Continue registration.
}

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