我的代码执行了，但是标头功能没有重定向到另一个页面。

Question

我的代码执行了（条目已插入数据库），但没有重定向到page.php。回声韦尔多工作，但标头功能不能。我怀疑ob_start（）并在使用它后仍未重定向。我错了什么或想念什么？谢谢。

<?php session_start();?>
<?php include "connection.php";?>
<?php ob_start(); ?>
<?php
try { $conn = new PDO("mysql:host=$servername;dbname=$dbname", $loginame, $pw);
    // set the PDO error mode to exception
     $conn->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
  //  $conn->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
  

    // prepare sql and bind parameters
    $stmt = $conn->prepare("INSERT INTO database (username, password, name, 
    lastname, email, Title, Birth_Day, Birth_Month, Birth_Year, State, marital_status, gender, maiden)VALUES (:username, :password, :name, :lastname, :email, :Title, :Birth_Day, :Birth_Month, :Birth_Year, :State, :marital_status, :gender, :maiden)
    
        $stmt->bindParam(':username', $username);
    $stmt->bindParam(':password', $password);
    $stmt->bindParam(':name', $name);
    $stmt->bindParam(':lastname', $lastname);
    $stmt->bindParam(':email', $email);
    $stmt->bindParam(':Title', $title);
    $stmt->bindParam(':Birth_Day', $Birth_Day);
    $stmt->bindParam(':Birth_Month', $Birth_Month);
    $stmt->bindParam(':Birth_Year', $Birth_Year);
    $stmt->bindParam(':State', $state);
    $stmt->bindParam(':marital_status', $maritalstatus);   
    $stmt->bindParam(':gender', $gender);
    $stmt->bindParam(':maiden', $maiden);
    
    $stmt->execute();
   $_SESSION["username"] = $username;
//  echo "weeldo";}   
 header("location: page.php");ob_end_clean();}
catch(PDOException $e){echo "Error: " . $e->getMessage();}
$conn = null;}?>