E_WARNING

Cannot modify header information - headers already sent by (output started at /home/zatokzdl/donggiatri.com/faucet.donggiatri.com/modules/ptc.donggiatri.com/site/accountnotification.php:36)

The error occurred on line 101 in file: 

/home/zatokzdl/donggiatri.com/faucet.donggiatri.com/modules/ptc.donggiatri.com/site/accountnotification.php

PHP 7.4.33 (Linux)

This should not happen. Ideally all notices, warnings, and errors should be handled in your code. To avoid this:

  1. Always define variables before you use them.
  2. Remember to check that a file exists before including it.
  3. Always handle potential errors according to coding standards. I.e. Show a relevant error to the user, fail silently, or log events to a file on the server.

Note. The above is probably not a complete list.