PHP注册email-validate登录脚本/类

I am looking for a decent PHP script or class library to handle user sign-up/register, email-validation and login for a website. I've written this sorta thing before, but I'd rather use something more tested and robust. The handful of open-source offerings I have thus far come across are, in my view, not very good. I've also looked at I am looking for a decent PHP script or class l