PHP Fix Warning: Cannot modify header information - headers already sent [duplicate]

Answer 1

Ensure the call to set cookies is the first thing processed.

So this:

  setcookie('username', "", time() - (60 * 60 * 24 * 365));
  setcookie('password', "", time() - (60 * 60 * 24 * 365));

should be called as soon as possible, before any output.

To fix this all you may need to do is remove: and test it.

Then re-add it in the relevant php file using:

echo '
';