php - 如何添加 case 语句以在每条记录后添加 break？

Question

当查找 LIKE 'B%' 的下一条记录时，每行 LIKE 'A%' 之后应该有一个中断。

$stmt = $con->prepare("SELECT * FROM fistevent WHERE Event_Id=? AND TicketType=? AND row_name REGEXP '^[A-Z]' ORDER BY row_name ASC");

$stmt->bind_param("ss", $_POST['EventId'],$_POST['TicketType']);
$stmt->execute();
$result = $stmt->get_result();
$numRows = $result->num_rows;
if($numRows > 0) {
    echo ' <div class="register">';
    while($r = $result->fetch_assoc()) {
        $EvntId = $r['Event_Id'];
        $RowName = $r['row_name'];

        echo '<ul id="sub" class="sub">';
            if($r['seats'] == null){ 
                echo '<li class="BlankSeat" ></li>';
            }elseif($r['Status'] == 'Y' || $r['Status'] == 'Hold'){
                echo '<li class="occupied" title="Row'.$r["seats"].'" name="'.$RowName.'" value="'.$r["seats"].'"></li>'; 
            }else{
                echo '<li class="Available" title="Row'.$r["seats"].'" name="'.$RowName.'" value="'.$r["seats"].'"></li>';
            }
        echo "</ul>";
   }
   echo '</div>';

I am getting the following output, but I want after `LIKE 'A%'` the next `LIKE 'B%'` should be in the next row.

更新代码在这里

$stmt = $con->prepare("SELECT * FROM fistevent WHERE Event_Id=? AND TicketType=? AND row_name REGEXP '^[A-Z]' ORDER BY row_name ASC");
$stmt->bind_param("ss", $_POST['EventId'],$_POST['TicketType']);
$stmt->execute();
$result = $stmt->get_result();
$numRows = $result->num_rows;
if($numRows > 0) {
    echo ' <div class="register">';
    $prev='A';  
    while($r = $result->fetch_assoc()) {
        $EvntId = $r['Event_Id'];
        $RowName = $r['row_name'];
        if($prev!=$RowName){
            echo "<br>";
            $prev=$RowName;
        }
        echo '<ul id="sub" >';
            if($r['seats'] == null){ 
                echo '<li class="BlankSeat" ></li>';
            }elseif($r['Status'] == 'Y' || $r['Status'] == 'Hold'){
                echo '<li class="occupied" title="Row'.$r["seats"].'" name="'.$RowName.'" value="'.$r["seats"].'"></li>'; 
            }else{
                echo '<li class="Available" title="Row'.$r["seats"].'" name="'.$RowName.'" value="'.$r["seats"].'"></li>';
            }
        echo "</ul>";
    }
    echo '</div>';
}else{
    echo "No seats Available";
}

**in responsive**

Answer 1

由于您按 row_name 排序，您只需要检查新值是否与以前的值不同。

//setting firstLetter
$firstLetter = '1';
  while($r = $result->fetch_assoc()) {
        $EvntId = $r['Event_Id'];
        $RowName = $r['row_name'];


       echo '<ul id="sub" class="sub">';
        if($r['seats'] == null)
        { 
        echo '<li class="BlankSeat" ></li>';
        }
        else if($r['Status'] == 'Y' || $r['Status'] == 'Hold')
        {
        echo '<li class="occupied" title="Row'.$r["seats"].'" name="'.$RowName.'" value="'.$r["seats"].'"></li>'; 
        }
        else
        {
         echo '<li class="Available" title="Row'.$r["seats"].'" name="'.$RowName.'" value="'.$r["seats"].'"></li>';
        }
        //comparing current first letter with previous first letter,also skipping the break if it is the first row
         if($RowName[0] != $firstLetter &&  $firstLetter !='1'  ){
         echo "<br />";
        }
        $firstLetter = $RowName[0];

       echo "</ul>";
       }