html表中的多个foreach循环

Question

在我的数据库中，我有2个表。

轴表：

 ______________________________________
| axle_id | train_id | axle | distance |  
|_________|__________|______|__________|   
|   1     |     1    |   1  |    20    |
|   2     |     1    |   2  |    50    |
|   3     |     1    |   3  |   200    |
|   4     |     1    |   4  |    50    |
|   5     |     1    |   5  |   200    |
|   6     |     1    |   6  |    50    |
|   7     |     1    |   7  |   200    |
|   8     |     1    |   8  |    50    |
|_________|__________|______|__________|

转向架表：

 ___________________________________________
| bogie_id | axle_id | train_id | bogie_nr |  
|__________|_________|__________|__________|   
|    1     |    1    |    1     |    1     |
|    2     |    2    |    1     |    1     |
|    3     |    3    |    1     |    2     |
|    4     |    4    |    1     |    2     |
|    5     |    5    |    1     |    3     |
|    6     |    6    |    1     |    3     |
|    7     |    7    |    1     |    4     |
|    8     |    8    |    1     |    4     |
|__________|_________|__________|__________|

现在我想在我的页面上显示这些结果：

 _____________________
| bogie_nr | axle    |  
|__________|_________|   
|    1     |    1    |
|    1     |    2    |
|    2     |    3    |
|    2     |    4    |
|    3     |    5    |
|    3     |    6    |
|    4     |    7    |
|    4     |    8    |
|__________|_________|

我尝试使用此代码执行此操作：

<table id="end_result_axle_bogies">
    <tr>
        <th>Train Axles</th>
        <th>Train Bogies</th>
    </tr>

    <!--Show the end result!-->
    <?php
        $show_end_table = $database->axles($_GET['train_id']);
        $show_end_table2 = $database->bogies($_GET['train_id']);
        foreach($show_end_table as $end_axle_table){ 
            echo "<tr>" . "<td>" . $end_axle_table['axle'] . "</td>";
        }
        foreach($show_end_table2 as $end_axle_table2){ 
            echo "<td>" . $end_axle_table2['bogie_nr'] . "</td>" . "</tr>";
        } 
    ?>
</table>

输出有效（向我显示正确的信息）。但是这张桌子效果不好。它向我展示了这个结果：

（将文字设为绿色以查看div是否正常工作。确实如此。）

有人知道如何使表正常工作吗？

Answer 1

试试这个：

<?php
    $show_end_table = $database->axles($_GET['train_id']);
    $show_end_table2 = $database->bogies($_GET['train_id']);
    $table2 = "";
    foreach($show_end_table2 as $end_axle_table2){ 
        $table2[] = $end_axle_table2['bogie_nr'];
    } 
    foreach($show_end_table as $key => $end_axle_table){
        echo "<tr>";
        echo "<td>" . $end_axle_table['axle'] . "</td>";
        echo "<td>" . $table2[$key] . "</td>";
        echo "</tr>";
    }
?>

改变foreach。就像你现在一样，它是<tr><td>1</td><tr><td>2</td> ...在一个foreach中回声是更好的方法。

Answer 2

可能是以下代码适合您....

<table id="end_result_axle_bogies">
<tr>
    <th>Train Axles</th>
    <th>Train Bogies</th>
</tr>

<!--Show the end result!-->
<?php
    $show_end_table = $database->axles($_GET['train_id']);
    $show_end_table2 = $database->bogies($_GET['train_id']);
    foreach($show_end_table as $end_axle_table){ 
        echo "<tr>" . "<td>" . $end_axle_table['axle'] . "</td>";
    }
</table>
<table>
foreach($show_end_table2 as $end_axle_table2){ 
        echo "<tr><td>" . $end_axle_table2['bogie_nr'] . "</td>" . "</tr>";
    } 
?>
</table>

Answer 3

试试这个：

从转向架表中取出所有bogie_nr和相应的axle_id 然后像

那样制作循环

foreach(bogie_nr as bogie)
 <tr>
     <td> show bogie_nr </td>
     <td> Fetch axle for respective axle_id of bogie_nr from axle table
     </td>
 </tr>
 end for loop
 </tr>

Answer 4

您可以尝试使用MySQL视图（info here），然后在foreach循环中循环遍历1视图，而不是进行2次数据库调用。