Use Of Undefined Constant in script

Question

I\'ve searched the site and saw fixes for the issue in which the user should have put single quotes around the variable but I still a bit confused.

Errors: (all refer to

Answer 1

$user_ok = evalLoggedUser($con,log_id,log_username,log_password);

change to:

$user_ok = evalLoggedUser($con,$log_id,$log_username,$log_password);