Question

这是我的代码。

<table border="1" style="width:800px">
                <?php $schedule_db = mysql_query("SELECT * FROM schedule WHERE '00:00' is not null and '01:00' is not null and '02:00' is not null and '03:00' is not null and '04:00' is not null and '05:00' is not null and '06:00' is not null and '07:00' is not null and '08:00' is not null and '09:00' is not null and '10:00' is not null and '11:00' is not null and '12:00' is not null and '13:00' is not null and '14:00' is not null and '15:00' is not null and '16:00' is not null and '17:00' is not null and '18:00' is not null and '19:00' is not null and '20:00' is not null and '21:00' is not null and '22:00' is not null and '23:00' is not null") 
                or die(mysql_error()); ?>
                <form method="post" action="config_action.php">
                <?php while($schedule = mysql_fetch_array( $schedule_db )) { ?>
                    <tr><?php if(isset($schedule['00:00'])) { ?><td style="width:32px"><?php echo $schedule['00:00'] ?></td><?php } if(isset($schedule['02:00'])) { ?><td style="width:32px"><?php echo $schedule['02:00'] ?></td><?php } if(isset($schedule['03:00'])) { ?><td style="width:32px"><?php echo $schedule['03:00'] ?></td><?php } if(isset($schedule['04:00'])) { ?><td style="width:32px"><?php echo $schedule['04:00'] ?></td><?php } if(isset($schedule['05:00'])) { ?><td style="width:32px"><?php echo $schedule['05:00'] ?></td><?php } if(isset($schedule['06:00'])) { ?><td style="width:32px"><?php echo $schedule['06:00'] ?></td><?php } if(isset($schedule['07:00'])) { ?><td style="width:32px"><?php echo $schedule['07:00'] ?></td><?php } if(isset($schedule['08:00'])) { ?><td style="width:32px"><?php echo $schedule['08:00'] ?></td><?php } if(isset($schedule['09:00'])) { ?><td style="width:32px"><?php echo $schedule['09:00'] ?></td><?php } if(isset($schedule['10:00'])) { ?><td style="width:32px"><?php echo $schedule['10:00'] ?></td><?php } if(isset($schedule['11:00'])) { ?><td style="width:32px"><?php echo $schedule['11:00'] ?></td><?php } if(isset($schedule['12:00'])) { ?><td style="width:32px"><?php echo $schedule['12:00'] ?></td><?php } if(isset($schedule['13:00'])) { ?><td style="width:32px"><?php echo $schedule['13:00'] ?></td><?php } if(isset($schedule['14:00'])) { ?><td style="width:32px"><?php echo $schedule['14:00'] ?></td><?php } if(isset($schedule['15:00'])) { ?><td style="width:32px"><?php echo $schedule['15:00'] ?></td><?php } if(isset($schedule['16:00'])) { ?><td style="width:32px"><?php echo $schedule['16:00'] ?></td><?php } if(isset($schedule['17:00'])) { ?><td style="width:32px"><?php echo $schedule['18:00'] ?></td><?php } if(isset($schedule['19:00'])) { ?><td style="width:32px"><?php echo $schedule['19:00'] ?></td><?php } if(isset($schedule['20:00'])) { ?><td style="width:32px"><?php echo $schedule['20:00'] ?></td><?php } if(isset($schedule['21:00'])) { ?><td style="width:32px"><?php echo $schedule['21:00'] ?></td><?php } if(isset($schedule['22:00'])) { ?><td style="width:32px"><?php echo $schedule['22:00'] ?></td><?php } if(isset($schedule['23:00'])) { ?><td style="width:32px"><?php echo $schedule['23:00'] ?></td><?php } ?></tr>
                <?php } ?>
                </form>
</table>

我想要做的是拥有一个表头（在所有其他行上方只有一行），它显示每列的时间，但前提是列中有值。

我以为我的代码类似于：

<tr><?php if(isset($schedule['00:00'])) { ?><td style="width:32px">00:00</td><?php } if(isset($schedule['01:00'])) { ?><td style="width:32px">01:00</td><?php } ?> etc.

然而，因为它处于while循环中，它将在每个实际行之前发生，这不是我想要发生的事情，我只想让它在顶部发生一次。

我该如何解决这个问题？有什么我可以追加到它只使它循环一次？

谢谢！

Answer 1

然后不要在while循环中输出你的行。将所有数据保存到var中。然后，如果var包含内容，则输出headrow，然后将var包含所有内容行。

修改

好吧，这是我写过的最丑陋的代码，你可能会使用数组和东西来使代码更小。但这是获得想法的代码片段...捕获所有行。在执行此操作时检查每个字段是否已填写。如果是，则在头部需要一个列。我们将data0设置为true即可。处理完整个数据后，我们检查每个var并查看是否为真。如果是这样，那么就要在头部打印列。所以最后你会看到，你输出了table-tag，然后输出了headrow-var，然后输出了包含所有格式化数据的字符串，然后输出了关闭table-tag。所以你得到了基本的想法。将头部和其他行存放在单独的变量中，并按正确的顺序排出......

// Get data from database-table... $schedule_db = mysql_query('...your query...') or die(mysql_error()); $data0 = false; $data1 = false; $data2 = false; // reapeat this for all hours till 23... while($schedule = mysql_fetch_array($schedule_db)) { if(isset($schedule['00:00'])) { $data0 = true; $row = '<td style="width: 32px;">' . $schedule['00:00'] . '</td>'; } // Reapeat this for every hour you need... if(isset($schedule['01:00'])) { $data1 = true; $row .= '<td style="width: 32px;">' . $schedule['01:00'] . '</td>'; } //... $rows .= $row; } $headrow = '<tr>'; if($data0 === true) $headrow .= '<th>00:00</th>' if($data1 === true) $headrow .= '<th>01:00</th>'; // Repeat for all hours... $headrow = '</tr>'; echo '<table>'; echo $headrow; echo $rows; echo '</table>';

PHP while循环和表头只显示是否设置了db值

1 个答案: