第51行的PHP登录系统错误？

Question

I'm creating a login system for a site I'm developing and this error appears when I enter a password into the password field:

Notice: Undefined variable: password in C:\xampp\htdocs\myfiles\login.php on line 51 you must enter your password

This is the code on line 51: if ($password){

This is some of the code surrounding the line:

Line 50: if ($user){

Other code surrounding the line:

echo "$user - $password <hr /> $form";
}
else
echo "you must enter your password $form";

}
else
echo "you must enter your username $form";

}
else
echo $form;

Anyone know what the problem is or could be?

Answer 1

Well, the only reason you're getting this error, is because you variable isn't defined. Try to use isset(), so:

if (isset($user) && isset($password)){