one.com上的标题未被执行且没有给出错误

Question

我正在为我的网站创建一个登录系统，当用户登录时我正在使用标题调用将它们重定向到另一个页面，标题调用没有执行，我没有收到任何错误，尽管我确实有打开one.com错误报告。

登录验证

if (isset($_POST['login'])&& $_POST['login'] !== "") { 

    $log = $login->check_login($username);
    if ($log) {
        // Registration Success

       header("Location: http://joshpercival.co.uk/webapp/indx.php");
    } else {
        // Registration Failed
        $password_error='Wrong username or password';
    }
}

登录类

public function check_login($username) {

    $sql2="SELECT user_id FROM users WHERE username='$username'";
       //checking if the username is available in the table
       $check = Database::getInstance()->getConnection()->query($sql2);
       $count_row = $check->num_rows;


    if ($count_row == 1) {
        // this login var will use for the session thing

        $_SESSION['user_id'] = $user_data['user_id'];
        return true;
    }
    else{
        return false;
    }
}