bind_param新手，这段代码出了什么问题？

        // Insert the new user into the database
        // This WORKS, and was copied from an example
        if ($insert_stmt = $mysqli->prepare("INSERT INTO members (username, email, password, salt) VALUES (?, ?, ?, ?)")) {
            $insert_stmt->bind_param('ssss', $username, $email, $password, $random_salt);
            // Execute the prepared query.
            if (! $insert_stmt->execute()) {
                header('Location: ../error.php?err=Registration failure: MEMBER. Please contact the developer.');
            }
            $insert_stmt->close();



            // If user inserted, add place with user as owner
            // This DOESN'T work, and was added by me
            //$ownerid = $mysqli->lastInsertId();
            $placename = $_POST['placename'];
            $placename = mysqli_real_escape_string($mysqli, $placename);
            $location = $_POST['autocomplete'];
            $location = mysqli_real_escape_string($mysqli, $location);
            if ($place_stmt = $mysqli->prepare("INSERT INTO places (member_owner, location, name) VALUES (?, ?, ?)")) {
                $place_stmt->bind_param('iss', 1, $location, $placename);
                if (! $place_stmt->execute()) {
                    header('Location: ../error.php?err=Registration failure: PLACE. Please contact the developer.');
                }
            }
            $place_stmt->close();
        }

        header('Location: ./register_success.php');

I can confirm that the 2 variables $location and $placename are successfully retrieved. The result I get from running this code is that the members table is successfully updated, but the places table is not and the script dumps me into a blank HTML.

I figured out that bind_param doesn't like to accept hard-coded values. I was trying to "test" my code by inserting a value of 1 into a column before I messed around with trying to get the last inserted ID. The error reporting suggested by Fred really helped (as did other suggestions, as you can see I've implemented).

The altered code:

    // Insert the new user into the database 
    if ($insert_stmt = $mysqli->prepare("INSERT INTO members (username, email, password, salt) VALUES (?, ?, ?, ?)")) {
        $insert_stmt->bind_param('ssss', $username, $email, $password, $random_salt);
        // Execute the prepared query.
        if (! $insert_stmt->execute()) {
            header('Location: ./error.php?err=Registration failure: MEMBER. Please contact the developer.');
            exit;
        }
        $insert_stmt->close();

        // If user inserted, add place with user as owner
        $ownerid = $mysqli->insert_id;
        if ($place_stmt = $mysqli->prepare("INSERT INTO places (member_owner, location, name) VALUES (?, ?, ?)")) {
            $place_stmt->bind_param('iss', $ownerid, $location, $placename);
            if (! $place_stmt->execute()) {
                header('Location: ./error.php?err=Registration failure: PLACE. Please contact the developer.');
                exit;
            }
        }
        $place_stmt->close();
        header('Location: ./register_success.php');
    }

Thanks for all the help!