如何在php中更改表行和列

Question

我有一张桌子：

<table>

    <tr>
      <td>date</td>
      <td>time1</td>      <td>time2</td>      <td>time3</td>
    </tr>
    <tr>
      <td>2017-01-14</td>
      <td>yes</td>    <td>--</td>     <td>yes</td>
    </tr>
    <tr>
      <td>2017-01-17</td>
      <td>--</td>     <td>--</td>     <td>yes</td>
    </tr>   <tr>
      <td>2017-01-23</td>
      <td>--</td>     <td>yes</td>    <td>yes</td>
    </tr>   </table>

我想将table，Rows和Column更改为：

<table>
    <tr>
      <td>date</td>
      <td>2017-01-14</td>
      <td>2017-01-17</td>
      <td>2017-01-23</td>
    </tr>

    <tr>
      <td>time1</td>
      <td>yes</td>
      <td>--</td>
      <td>--</td>
    </tr>
    <tr>
      <td>time2</td>
      <td>--</td>
      <td>--</td>
      <td>yes</td>
    </tr>
    <tr>
      <td>time3</td>
      <td>yes</td>
      <td>yes</td>
      <td>yes</td>
    </tr>
</table>

我该怎么做？