PHP提交页面完全空白

Question

我通过表单提交购买（我称之为订单）。我完全确信这部分工作正常，但购买需要插入数据库的页面是错误的。但是，我真的不知道什么是错的，为什么它只给了我一个空白页面（addorder.php，处理页面），而它应该给我在前一页上的错误消息。这是addorder.php代码：

<?php 

class PurchaseOrder 
{ 
    private $db_connection = null; 

    public $errors = array(); 

    public $messages = array(); 

    public function __construct() 
    { 
     if (isset($_POST["purchase"])) { 
      $this->addOrder(); 
     } 
    } 

    private function addOrder() 
    { 
     if (empty($_POST['order_firstname'])) { 
      $this->errors[] = "Please fill in your first name."; 
     } elseif (empty($_POST['order_lastname'])) { 
      $this->errors[] = "Please fill in your last name."; 
     } elseif (empty($_POST['order_phone'])) { 
      $this->errors[] = "Please fill in your phone number."; 
     } elseif (empty($_POST['order_address'])) { 
      $this->errors[] = "Please fill in your address."; 
     } elseif (empty($_POST['order_city'])) { 
      $this->errors[] = "Please fill in your city."; 
     } elseif (empty($_POST['order_postalcode'])) { 
      $this->errors[] = "Please fill in your postal code."; 
     } elseif (empty($_POST['order_deliverydate'])) { 
      $this->errors[] = "Please fill in a delivery date you like.";    
     } elseif (empty($_POST['order_country'])) { 
      $this->errors[] = "Please choose your country."; 

      $this->db_connection = new mysqli(DB_HOST, DB_USER, DB_PASS, DB_NAME); 

      if (!$this->db_connection->set_charset("utf8")) { 
       $this->errors[] = $this->db_connection->error; 
      } 

      if (!$this->db_connection->connect_errno) { 

       $lastorder= "SELECT orderNumber FROM orders ORDER BY orderNumber DESC LIMIT 1"; 
       $lastordernumber=mysql_query($lastorder); 

       while ($row=mysql_fetch_array($lastordernumber)) { 
        $lastnumber = $row['orderNumber']; 
       } 

       $order_firstname = $_POST['order_firstname']; 
       $order_lastname = $_POST['order_lastname']; 
       $order_phone = $_POST['order_phone']; 
       $order_address = $_POST['order_address']; 
       $order_city = $_POST['order_city']; 
       $order_postalcode = $_POST['order_postalcode']; 
       $order_deliverydate = $_POST['order_deliverydate']; 
       $order_country = $_POST['order_country']; 
       $order_date = date("Y-m-d"); 

       $customernumber = $_SESSION['CustomerNumber']; 

        $sql = "INSERT INTO orders (orderNumber, orderDate, requiredDate, shippedDate, status, comments, customerNumber) VALUES('" . $lastnumber . "', '" . $order_date . "', null, null, null, null, '" . $customernumber . "');"; 

        $query_new_order = $this->db_connection->query($sql); 

        if ($query_new_order) { 
         $this->messages[] = "Your profile has been updated succesfully!"; 
        } else { 
         $this->errors[] = "Sorry, your registration failed. Please go back and try again."; 
        } 
      } else { 
       $this->errors[] = "Sorry, no database connection."; 
      } 
     } else { 
      $this->errors[] = "An unknown error occurred."; 
     } 
    } 
} 

这是我的数据库中的“订单”表中的照片：

你们能帮助我吗，我调试的代码，并有没有语法错误。它会是什么？我很困惑，现在...

编辑：这是怎样的消息和错误显示sendviaparcel.php页面，这也与表单的页面上它：

<?php 
 
if (isset($purchaseOrder)) { 
 
    if ($purchaseOrder->errors) { 
 
     foreach ($purchaseOrder->errors as $error) { 
 
      echo '<div class="well"><h4><i class="fa fa-exclamation-triangle fa-3"></i> '.$error.'</h4></div>'; 
 
     } 
 
    } 
 
    if ($purchaseOrder->messages) { 
 
     foreach ($purchaseOrder->messages as $message) { 
 
      echo '<div class="well"><h4><i class="fa fa-check fa-3"></i> '.$message.'</h4></div>'; 
 
     } 
 
    } 
 
} 
 
\t \t 
 
\t require("includes/connection.php"); 
 
\t 
 
?>

这是sendviaparcel.php形式：

<form method="post" action="addorder.php" name="orderform"> 
 
\t \t <table class="table table-striped"> 
 
         <---THIS IS MY TABLE CONTENT---/> 
 
\t \t </table> 
 
\t <a href="index.php" class="btn btn-login">Cancel <i class="fa fa-times fa-2"></i></a> 
 
\t <button type="submit" class="btn btn-login btn-signin" name="purchase">Confirm purchase <i class="fa fa-check fa-2"></i></button> 
 
</div> 
 
</form>

Answer 1

空白页面最常出现的原因是缺少行结束符; ...或者在您的情况下，可能太多了？

$sql = "INSERT INTO orders (orderNumber, orderDate, requiredDate, shippedDate, status, comments, customerNumber) VALUES('" . $lastnumber . "', '" . $order_date . "', null, null, null, null, '" . $customernumber . "');";

在SQL语句的结束，你有可能是什么是你的代码搞乱不必要的;。

应该$customernumber . "')";