unified index

Question

i fined problem while i execute this code
$servername = "localhost";
$username = "username";
$password = "";
$dbname="test_sup";

$conn = new mysqli($servername, $username, $password, $dbname);

if ($conn->connect_error) {
die("Connection failed: " . $conn->connect_error);
}else{
$email=$_POST['email'];

$query="SELECT * FROM `sign_up` WHERE email='$email' AND password='$password'";
$res=$conn->query($query);
if($row=$res->fetch_assoc())
{
echo'logine successfuly';
}
else{
echo'password or email isnt correct';
}

Answer 1

undefined index error usually is triggered by an attempt to access an element of an array where the element referred to by index or key doesn't exist. I suspect it was happening when you tried to assign $_POST['email'] to $email variable, please check if there is an element in $_POST having 'email' as its key, you can do:

print_r($_POST);

To see if such element exists or not. I also noticed your query includes the $password variable that you used to connect to the localhost (which is blank), I just want to remind you whether it was intentional.

P.S. Will you move that error message out of "Relevant tags" and into "Description" please? it's confusing.

Hth, cmiiw

Answer 2

you probably not sending the email as a post, you can make a html form in another file set the method to post then create an input field name 'email' and submit button. so you can run the php code from that file