need help login with notepad based
i have to try to check whether my login information is correct or not, it's just contain username and password only. here is my config.txt content :
and here is my html index file :
user1, user2, user3
and here is my code to check login info.
everything is correct to check if the username was exists in text file but when I type wrong username (another user beside in notepad) it's just show me blank page cause I didn't know what code should i type in there :(
what should i do ?