Looking for logging into the Codex Oop site and are not getting the correct working link for it? In such a case, you can use the links given here by searching your desired login page in the search box. If the page is present on our website then you will get all the links related to the Codex Oop site. After that you can login as usual with your login credentials.
https://www.codexworld.com/registration-login-system-php-mysql-session/
https://codereview.stackexchange.com/questions/75181/simple-php-login-register-script-with-oop
https://www.codeofaninja.com/2013/03/php-login-script.html
http://www.w3programmers.com/login-registration-using-oop/
https://www.guru99.com/object-oriented-programming.html
https://books.google.de/books?id=pi0WAAAAYAAJ&pg=PA61&lpg=PA61&dq=codex+oop+login
https://books.google.de/books?id=j4mbTdsnpFUC&pg=PA131&lpg=PA131&dq=codex+oop+login
https://books.google.de/books?id=fy22NnID8SUC&pg=PA278&lpg=PA278&dq=codex+oop+login
https://books.google.de/books?id=M3uwbzhy7rsC&pg=PA182&lpg=PA182&dq=codex+oop+login