动态表格输出 - 每个字段在出现前会出现两次

有人能告诉我为什么在移动到下一个值之前，这会产生两个字段值两次？动态表格输出 - 每个字段在出现前会出现两次

$titles = array('invlineid','invoiceid','quantity','unitprice','itemdesc'); 
$headers = array('invlineid','invoiceid','quantity','unitprice','itemdesc'); 

$sql = "SELECT "; 

foreach(array_combine($headers, $titles) as $header => $title) 
{ 
    $sql .= "$header as $title,"; 
} 

$sql .= "linetotal as linetotal"; 
$sql .= " FROM invoicelineitem"; 
$sql .= " WHERE invoiceid = 1096"; 

try 
{ 
    $result = $pdo->query($sql); 
} 
catch (PDOException $e) 
{ 
    $error = 'Error getting invoice line items.---' . $e . '----' . $sql; 
    include $_SERVER['DOCUMENT_ROOT'] . '/mincludes/error.html.php'; 
    exit(); 
} 

if ($result !== false) 
{ 
    $html_table = '<table>'; 
    $html_table .= '<thead><tr>'; 

    foreach($titles as $title) 
    { 
     $html_table .= "<th> $title </th>"; 
    } 

    $html_table .= '</tr> </thead>'; 
    $html_table .= '<tbody id="dataTable">'; 

    foreach($result->fetchAll(PDO::FETCH_ASSOC) as $row) 
    { 
     $html_table .= '<tr>' . "\n"; 

     foreach($row as $col) 
     { 
      $html_table .= '<td>'; 
      $html_table .= '<input type=text name=' . $title; 
      $html_table .= ' value=' . $col . '>'; 
      $html_table .= '</td>' . "\n"; 
     } 

     $html_table .= '</tr>' . "\n"; 
    } 
} 

$html_table .= '</tbody> <tr> </table>';

当它到达单个记录的末尾时，它会在表格中开始一个新行，但同样会产生两次每个值。

来源

2015-02-05 recker277687