问如何从PHP数据库中获取数据？

EN

function getLocalKey()
{
    $servername = 'localhost';
    $username   = 'XXX';
    $password   = 'XXX';
    $dbname     = 'XXX';
    $conn       = new mysqli($servername, $username, $password, $dbname);

    if ($conn->connect_error) {
        breakDown("Failed connection to MySQL-Server please make sure that you've entered all
                  MySQL-Data correctly into the config.php and that the MySQL-Server is running!", 1);
    } else {
        $query  = "SELECT * FROM `verifykey` WHERE `id`= '1'";
        $result = mysqli_query($conn, $query);

        if ($result->num_rows > 0) {
            while ($row = mysqli_fetch_array($result)) {
                return $row['verifykey'];
            }
        } else {
            return '0 results';
        }

        $conn->close();
    }
}