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https://stackoverflow.com/questions/11314373/creating-a-login-system-in-php
https://codereview.stackexchange.com/questions/48958/first-php-login-system
https://www.cloudways.com/blog/add-facebook-login-in-php/
https://superuser.com/questions/1224186/how-to-get-logged-persons-user-id-from-the-database-and-insert-it-in-to-the-oth
https://console.bluemix.net/docs/tutorials/lamp-stack.html
https://www.sitepoint.com/user-authentication-mean-stack/
https://laravel.com/docs/5.7/logging
https://www.turnkeylinux.org/lamp
https://developers.onelogin.com/api-docs/1/login-page/create-session-login-token
https://www.w3schools.com/howto/howto_css_stacked_form.asp
https://wordpress.org/support/topic/fatal-error-cant-log-in-to-fix-it/
https://support.stackpath.com/hc/en-us/articles/360001456443-Script-example-wp-login-php-protection
https://www.formstack.com/