将静态值传递到pdo插入块，失败

Question

我有一条sql插入语句，该语句插入6个表列中。最后两个使用预定义的值。在sql语句的值部分中，我只是将值放在引号内（并且它在下面的教程中起作用），但是它不起作用。我删除了sql语句中的最后两个值和列，并很好地插入了它们，因此出于某种原因它不采用静态值。谁能发现问题？

if (isset($_POST["submit"])){
  $name = $_POST["commenterName"];
  $email = $_POST["commenteremail"];
  $comment = $_POST["commenterthoughts"];
  date_default_timezone_set("Europe/Dublin");
  $currenttime = time();
  $datetime= strftime("%B-%d-%Y %H:%M:%S", $currenttime);




    $sql = "INSERT INTO comments(datetime,name,email,comment,approvedby,status) VALUES(:time,:name,:email,:comment,'pending','off')";
    $stmt = $connect->prepare($sql);
    $stmt->bindValue(':time',$datetime);
    $stmt->bindValue(':name',$name);
    $stmt->bindValue(':email',$email);
    $stmt->bindValue(':comment',$comment);
    $Execute = $stmt->execute();



    if($Execute){
      $_SESSION["success"] = "data added successfully";
      redirect("fullpost.php");
    }else {
      $_SESSION["error"] = "something went wrong. data not added to table";
      redirect("fullpost.php");
    }
  }