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https://stackoverflow.com/questions/11235365/class-design-of-object-oriented-login-system-in-php
https://codereview.stackexchange.com/questions/11004/user-class-design
https://www.phpclasses.org/blog/package/10087/post/1-secure-login-and-registration-system.html
https://phptherightway.com/pages/Design-Patterns.html
https://codeshack.io/secure-login-system-php-mysql/
https://www.c-sharpcorner.com/UploadFile/4ab77c/create-login-and-registration-form-in-php-by-using-oops-conc/
https://phppot.com/php/material-design-login-form-with-php-and-jquery/
http://www.w3programmers.com/login-registration-using-oop/
https://www.codeofaninja.com/2014/06/php-object-oriented-crud-example-oop.html
https://www.studioweb.com/courses/view/php_login_with_oop_and_mvc
https://www.tutorialspoint.com/php/php_login_example.htm