Question

I created a very simple login page where I validate the username and password on PHP after submitting the form.

My first step in the validation is to check that the username and password are not empty, if empty I send the user back to the login page:

$e = $_POST['email'];
$p = $_POST['password'];


if($e == '' || $p == ''  || is_null($e) || is_null($p)){
    header('Location: login.php?e=missing');
}

it turns out that the if statement that checks if the username and password are empty only works if I add an else statement:

$e = $_POST['email'];
$p = $_POST['password'];


if($e == '' || $p == ''  || is_null($e) || is_null($p)){
    header('Location: login.php?e=missing');
}else{

    //more validation
}

To be honest, my code works, I added the else and problem solved, but WHY???
Thanks.

Answer 1

$e = $_POST['email'];
$p = $_POST['password'];


if(trim($e) == '' || trim($p) == ''){
    header('Location: login.php?e=missing');
    exit(); // add this else it wont leave the page!
}else{

    //more validation
}