html表中的多个foreach循环

Question

在我的数据库中，我有 2 个表。

轴台：

 ______________________________________
| 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：

 ___________________________________________
| 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以这样的表格显示这些结果：

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

我试着用这段代码来做这个：

<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（显示正确信息）。但是桌子不好用。它向我展示了这个结果：

（将文本设为绿色以查看 div 是否正常工作。确实如此）。

有人知道如何让桌子正常工作吗？

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>";
    }
?>

更改 foreach。就像您现在所做的那样，它是 <tr><td>1</td><tr><td>2</td>... 在一个 foreach 中回显是更好的方法。

Answer 2

您可以尝试使用 MySQL 视图 (info here)，然后在 foreach 循环中遍历 1 个视图，而不是执行 2 个数据库调用。

Answer 3

试试这个：

从转向架表中获取所有 bogie_nr 和相应的 axis_id
然后像这样进行for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

下面的代码可能对你有用....

<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>