显示发布的 HTML 时出错

我将div的内容存储在textaera中，然后将内容发布到另一个页面。

第二页应该简单地打印出 html，就好像它是直接写在该页面中的一样。

内容显示，除了在 html 中，它被打印为 ''"（例如在图像源和 ID 上

为什么会发生这种情况，我该怎么做才能避免这种情况？

该网页：

<textarea name="message" rows="10" cols="34"><table><tr>
      <td style="color: #333333;table-layout:fixed;text-align:left;vertical-align:top;" id="imgCell3"><img src="https://www.pnrbuilder.com/_images/itinerary/airlines_AC.gif"><br>
        AC # 7469</td>
      <td class="itinCell">06:30 AM on Tue, October 22, 2013<br>
        Newark/Elizabeth, NJ (EWR): Newark Liberty Intl. Airport</td>
      <td class="itinCell">8:03 AM on Tue, October 22, 2013 <br>
        Mississauga,&nbsp;Ontario,&nbsp;Canada (YYZ): Toronto Pearson Intl. Airport</td>
      <br>
    </tr>
  </table></textarea><br /><br />
<input type="submit" value="POST"/>

该 php：

echo '<strong>This is the email content as it was posted to the page:</strong><br>'.$_POST['message'].'<br><br><br>';

生成的源代码由 php 回显：

<strong>This is the email content as it was posted to the page:</strong><br><table><tr>
      <td style='"color: #333333;table-layout:fixed;text-align:left;vertical-align:top;'" id='"imgCell3'"><img src='"https://www.pnrbuilder.com/_images/itinerary/airlines_AC.gif'"><br>
        AC # 7469</td>
      <td class='"itinCell'">06:30 AM on Tue, October 22, 2013<br>
        Newark/Elizabeth, NJ (EWR): Newark Liberty Intl. Airport</td>
      <td class='"itinCell'">8:03 AM on Tue, October 22, 2013 <br>
        Mississauga, Ontario, Canada (YYZ): Toronto Pearson Intl. Airport</td>
      <br>
    </tr>
  </table>