如何将数组项分组以输出到表PHP中

Question

I have an array like this:

Array
(
    [0] => Array
        (
            [date] => 2012-11-29
            [description] => Work Done
            [hours] => 1.0
            [id] => 6502
            [person-id] => 8853
            [project-id] => 8928
            [todo-item-id] => 122353
            [person-name] => Jane Doe
        )

    [1] => Array
        (
            [date] => 2012-11-29
            [description] => Work Done 2
            [hours] => 1.0
            [id] => 6502
            [person-id] => 8853
            [project-id] => 8928
            [todo-item-id] => 122353
            [person-name] => Jane Doe
        )

    [2] => Array
        (
            [date] => 2012-11-28
            [description] => Work Done 3
            [hours] => 1.0
            [id] => 6502
            [person-id] => 8853
            [project-id] => 8928
            [todo-item-id] => 122353
            [person-name] => Jane Doe
        )

Etc.

I want to display this information in a table grouped by Date. I'm using foreach to get each of the values but I'm trying to figure out how to examine if the date is the same in each array and only echo the date once if so. This is what I've got so far...

<table>
     <tbody>
                <?php 

                  foreach($time as $log){
                    //tried this but it doesn't work 
                    //if(array_unique($log['date'])){
                      echo '<thead>
                              <tr class="info">
                                <td colspan="3">'.$log[date].'</td>
                              </tr>
                            </thead>';
                          //};


                  echo "<tr>";
                  echo "<td>{$log['todo-item-id']}</td>";
                  echo "<td>{$log['description']}</td>";
                  echo "<td>{$log['hours']}</td>";
                  echo "</tr>";
                } ?>

              </tbody>
</table>

Answer 1

You can only have one thead. Set the date at the end of the loop, or after you've done the following comparison: is this date not equal to the previous one, or not set. If so, output it else output a non-breaking space.

<?php 

foreach($time as $log) {
    // check if it is not set or not equal and output if needed
    echo '<tr class="info">
            <td colspan="3">'.(!isset($prevdate) || $prevdate!=$log[date]? $log[date] : '&nbsp;').'</td>
          </tr>
        ';

    echo "<tr>
        <td>{$log['todo-item-id']}</td>
        <td>{$log['description']}</td>
        <td>{$log['hours']}</td>
        </tr>";
    // set it
    $prevdate=$log[date];
} 
?>