Standard user authenification for website plugin?

Hi there, back in the early noughties I would have programmed a user login, register function for a website myself but figure there must be a better standard out there by now. Is there a good free/cheap user authentification system I can add to a php site with all the basics.

eg
user login with Robot protection
registration and email confimation facility
forgotten password
easy page proection-members pages

all suggestions welcome.
williery10Asked:
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Ray PaseurCommented:
You can get all of these things from almost any PHP framework.  I recommend Laravel, but the Sitepoint survey mentions others and compares the popularity.  WordPress is an option.
http://laravel.com/
http://www.sitepoint.com/best-php-framework-2015-sitepoint-survey-results/

If you want to learn the technologies and design patterns for these things, they are described in these articles.

User Login, Easy Page Protection:
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_2391-PHP-login-logout-and-easy-access-control.html

Robot Protection (I assume you mean something like this):
http://www.experts-exchange.com/Web_Development/Web_Languages-Standards/PHP/A_9849-Making-CAPTCHA-Friendlier-with-PHP-Image-Manipulation.html

Registration and Email Confirmation:
http://www.experts-exchange.com/articles/3939/Registration-and-Email-Confirmation-in-PHP.html

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Scott Fell, EE MVEDeveloper & EE ModeratorCommented:
I think what is better is in the eye of the beholder so to speak.  

A while back I found this project http://www.php-login.net/ and ended up using Ray's article because it did exactly what it is supposed to and easy to follow.  The php-login project when I first downloaded it was a monster and had a lot of "to do's" in the code and notes that things were awkward and needed to be rewritten.   It was nice to read through the code for another perspective, but the notes in the code scared me off and I went with Ray's solution that he pointed to.  

I have worked a lot in classic asp and things work a bit different and sessions work a bit different and are problematic. Somewhat based on how Ray wrote his program, I did the same for Classic ASP http://www.experts-exchange.com/articles/18259/User-Log-In-Using-A-Token.html.
williery10Author Commented:
Thanks for the input guys. Very helpful!
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