Question

我希望只更新我在PHP中创建的关联数组中的[“distanceTimeFromNextPoint”]元素。

我正在尝试更新以下数组结构：

Array 
( 
  [0] => Array 
  ( 
    [Total time] => 0:00 
    [0] => Array 
    ( 
      [place] => Spanish steps  
      [distanceTimeFromNextPoint] =>  
    ) 
    [1] => Array 
    ( 
      [place] => Piazza Venezia 
      [distanceTimeFromNextPoint] =>  
    ) 
  ) 
  [1] => Array 
  ( 
    [Total time] => x0:00 
    [0] => Array  
    ( 
      [place] => Piazza Venezia 
      [distanceTimeFromNextPoint] => 
    ) 
    [1] => Array 
    ( 
      [place] => Spanish steps 
      [distanceTimeFromNextPoint] => 
    ) 
  ) 
)

但是当我运行此循环时，[“总时间”]元素也会更新！ 关于我的循环有什么问题的想法以及如何更改它？

这是我的代码（上面的数组定义为$ new_array）：

foreach($new_array as $i=>$element)
{
    foreach($element as $j=>$sub_element)
    {         
         $new_array[$i][$j]['distanceTimeFromNextPoint']="x";
    }
}

提前谢谢。

Answer 1

如果我得到了正确的结构，只需添加一个条件，其中您要排除该键并检查该元素是否具有所需的子键，然后进行修订：

foreach($new_array as $i => $element) {
    foreach($element as $j => $sub_element) {
        if($j !== 'Total time' && array_key_exists('distanceTimeFromNextPoint', $sub_element)) {
            $new_array[$i][$j]['distanceTimeFromNextPoint'] = 'x';
        }
    }
}

Sample Output

Answer 2

您应该测试元素'distanceTimeFromNextPoint'是否已经存在。

<?php $query_tbl = "SELECT transaksi.id_transaksi, pelanggan.nama FROM transaksi, pelanggan ". 
        "WHERE transaksi.id_pelanggan = pelanggan.id_pelanggan ORDER BY id_transaksi";

    $list_tbl = mysqli_query($dbc, $query_tbl)
        or die('Error select table');

    while($row = mysqli_fetch_array($list_tbl))
    { 
        echo '<tr>';
        echo '<td>' . $row['id_transaksi'] . '</td>';
        echo '<td>' . $row['nama'] . '</td>';
?>  <!-- here ends the PHP -->
        <form method="post" action="pengiriman-input.php">
            <input type="hidden" name="id" value="<?php echo $row['id_transaksi']; ?>" />
            <input type="submit" value="Kirim" />
        </form>
<?php // here begin PHP again
        echo '</tr>';
    };?>

PHP更新关联数组

2 个答案: