I hid and learned a lot here at Stack Overflow that I have to contribute to a resource that embodies the very spirit here in terms of usability and security;
Script users Register, login, online
This is a PHP script for registering and logging in users to a website and shows users online. He has the ability to log in using Facebook, Yahoo or with a Google account. It is created using a method based on classes and objects (OOP). Uses PHP, MySQL and Ajax / JavaScript (with jQuery) [it can work in browsers with JavaScript disabled). Connecting to MySQL is done with PDO.
HTML code is valid. HTML5 also works in Internet Explorer browsers that do not recognize HTML5 tags.
I PERSONALLY used this and helped the developer to erase ONLY the error in the application, so if this is the registration / management system you need, this is your script. And it's free.
http://coursesweb.net/php-mysql/register-login-script-users-online_s2
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