php PHP

[Computer Dynamics]

So i don't know if im posting in the right parent topic, please excuse me if i am.

But i need some help when it comes to this php error i,m getting much information is needed please and thank you, the error i,m getting is 

PHP Notice:  Undefined variable: servername in C:\inetpub\wwwroot\Admin5\WOconf.php on line 11

 

My page code bellow

 

$servername = "localhost";
$username = "******";
$password = "************";
$dbname = "****";

// Create connection
$conn = mysqli_connect($servername, $username, $password, $dbname);
// Check connection
if (!$conn) {
    die("Connection failed: " . mysqli_connect_error());
}

$clientname = $_POST['client_name'];
$accountnumber = $_POST['account_number'];
$contactnumber = $_POST['contact_number'];
$address = $_POST['address'];
//$servicetype = $_POST['service_type'];
//$serialnumber = $_POST['serial_number'];
//$brand = $_POST['d_brand'];
$devicetype = $_POST['device_type'];
$devicemodel = $_POST['device_model'];
$loggeddate = $_POST['logged_date'];
$requesteddate = $_POST['requested_date'];
$cost = $_POST['cost'];
$techID = $_POST['techID'];
$problemcomment = $_POST['problem_comment'];
$email = $_POST['user_email'];

 

$sql = "INSERT INTO work_orders (clientname, accountnumber, contactnumber, address, devicetype,  devicemodel, loggeddate, requesteddate, cost, techID, problemcomment, email)
VALUES ('$clientname', '$accountnumber', '$contactnumber', '$address','$devicetype', '$devicemodel', '$loggeddate', '$requesteddate', '$cost', '$techID', '$problemcomment', '$email')";

if (mysqli_query($conn, $sql)) {
    echo "New record created successfully";
} else {
    echo "Error: " . $sql . "<br>" . mysqli_error($conn);
}

mysqli_close($conn);
?>

[Tycho]

This is as an exercise right? Not for an actual application? 

[Computer Dynamics]

correct is rite, i'm not really verse in php and HTML coding, it worked before idk what went wrong