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https://makitweb.com/prevent-multiple-login-of-same-account-with-php/
https://stackoverflow.com/questions/1727919/how-to-prevent-multiple-logins-in-php-website
https://www.sitepoint.com/forums/showthread.php?432140-prevent-multiple-login-in-php
https://www.experts-exchange.com/questions/21320370/PHP-Mysql-prevent-multiple-logins.html
https://www.experts-exchange.com/questions/27845996/Prevent-multiple-logins-from-the-same-user-with-PhP.html
https://www.daniweb.com/programming/web-development/threads/229576/prevent-multiple-login-help-needed
https://bytes.com/topic/php/answers/702736-preventing-multiple-users-logging-into-same-account-same-time
http://asprunner.com/forums/topic/15046-allow-only-one-login-per-account-prevent-user-sharing/
https://www.codeproject.com/Questions/402799/How-to-avoid-Multiple-Logins-With-Same-UserName-an
https://github.com/netromedia/prevent-multiple-logins-wp/blob/master/prevent-multiple-logins.php
https://github.com/fjarrett/prevent-concurrent-logins/blob/master/prevent-concurrent-logins.php
https://www.webmasterworld.com/php/3055206.htm