如何根据结束日期显示组数据？

Question

I have a table like below:

How can i display the data based on task end date with new table. Meaning that, the full <div tag`` will repeat for each ending date and display the records on columns. For example-

                                        **Staff 1**

Date: 2020-11-14

Date: 2020-11-27

                                         **Staff 2**

Date: 2020-11-14

Thanking in anticipation.

<div>
<table class="table table-bordered">
<tr>
<th>ID</th>
<th>Task Name</th>
<th>Remarks</th>
<th>Start Date</th>
<th>End Date</th>
</tr>
<?php
$sql = "SELECT * FROM dl_fullremarks ";
$result = mysqli_query($conn, $sql);
foreach ($result as $row) {?>
<tr>
<td><?php echo $row['staff_id']; ?></td>
<td><?php echo $row['task_name']; ?></td>
<td><?php echo $row['task_remarks']; ?></td>
<td><?php echo $row['task_startdate']; ?></td>
<td><?php echo $row['task_enddate']; ?></td>
</tr>
    <?php
}
?>
</table>
</div>

Answer 1

You can fetch your data first with SQL and then organize it with a PHP associative array:

$data = [];
foreach ($result as $row) {
    // Check if the current end date is part of the array. If not, add it
    if (!isset($data[$row['task_enddate']]) {
        $data[$row['task_enddate']] = [];
    }
    // Add the row to the assigned end date
    $data[$row['task_enddate']][] = $row;
}

$data nows contains the following structure:

[
    '2020-11-14' => [
        ['staff_id' => 1, 'task_name' => 'name', // ...],
        ['staff_id' => 2, 'task_name' => 'other name', // ...],
    ],
    '2020-12-16' => [
        ['staff_id' => 3, 'task_name' => 'name', // ...],
    ],
]

You can now loop through it to display your template:) !

foreach ($data as $date => $rows) {
    echo '<div>';
    echo "<div>$date</div>";
    echo '<div class="row">';
    foreach ($rows as $row) {
        // Display your row data here
    }
    echo '</div></div>';
}

Answer 2

Group result set by task_endtime :

SELECT * FROM dl_fullremarks
WHERE staff_id = '1'
ORDER BY task_endtime

When task_endtime changed from last saved then print header. All other rows are printed as in your example.

$prev_endtime = null
foreach ($result in $rows) {
  if (date('Y-m-d', $row['taks_endtime']) != $prev_endtime) {
    echo '<div class="header">date formatted here</div>';
    $prev_endtime = date('Y-m-d', $row['task_endtime']);
  }
  echo '<div class="row">row cells gere</div>';
}