Email Verification code system

[eluser]Mirge[/eluser]
Ion Auth 2 has this functionality built in... https://github.com/benedmunds/CodeIgniter-Ion-Auth

I'm not sure why you'd build one from scratch unless you just felt like it or had very specific requirements... but even then I'd probably still start with a pre-existing base. At any rate, you can look & see how he did it.