如何使这个PHP / HTML页面有3列而不是2列？

Question

现在，它从MySQL数据库中提取数据并将数据（名称）放在两个并排的列中。我怎么做这个3？我不是PHP / HTML / CSS专家。为了数字标牌的目的，它应该从数据库中提取捐赠者的名字并显示它们。

$sql = "SELECT * FROM donor WHERE DonationAmount = 1000 AND Category = '2' ORDER BY LastName ASC";
$result = mysqli_query($conn, $sql);
$i = 0;
$total_rows = $result->num_rows;
echo "<table><tr>";
if (mysqli_num_rows($result) > 0) {
    echo "<p style=font-size:20px;>In Honor Of</p>";
    // output data of each row
    while($row = mysqli_fetch_assoc($result)) {

        // test if the DisplayName field is empty or not
    echo "<td>";
    if(empty($row['DisplayName']))
    {
            // it's empty!
            if(empty($row['FirstName'])){
                    echo $row['LastName'];
            }

            else{
                    echo $row["LastName"]. ", " . $row["FirstName"];
            }

    }else{
            // Do stuff with the field
            echo $row["DisplayName"]. "";
    }
    echo "</td>";
    $i++;
    if($i % 2 == 0 && $i != $total_rows) {
            echo "</tr><tr>";
    }

  }
} else {

}
echo "</tr></table>";

Answer 1

点击这里MOD

$column = 3;
$sql = "SELECT * FROM donor WHERE DonationAmount = 1000 AND Category = '2' ORDER BY LastName ASC";
$result = mysqli_query($conn, $sql);
$i = 0;
$total_rows = $result->num_rows;

echo "<h2>In Honor Of</h2>";

echo "<table><tr>";
if ($total_rows > 0) {
    // output data of each row
    while($row = mysqli_fetch_assoc($result)) {

        // test if the DisplayName field is empty or not
    echo "<td>";
    if(empty($row['DisplayName']))
    {
            // it's empty!
            if(empty($row['FirstName'])){
                    echo $row['LastName'];
            }

            else{
                    echo $row["LastName"]. ", " . $row["FirstName"];
            }

    }else{
            // Do stuff with the field
            echo $row["DisplayName"]. "";
    }
    echo "</td>";
    $i++;

    /*i % column */
    if($i % $column == 0 && $i != $total_rows) {
            echo "</tr><tr>";
    }

  }
} else {

}
echo "</tr></table>";