php - 如何在 PHP 中使用 while 循环按 ID 列出节中的数据？

Question

我有一个包含这些列的 mysql 表:

series_id, series_color, product_name

在输出中，我想按部分列出数据，每个 series_id 一个部分，像这样:

A12 Series Product

 - Milk  
 - Tea 
 - sugar
 - water

B12 Series Product

 - Water 
 - Banana 
 - Cofee 
 - Tea

Answer 1

按 series_id 对结果进行排序，所以所有具有相同值(value)的产品都会在一起。

$stmt = $pdo->prepare("SELECT series_id, product_name
                       FROM yourTable
                       ORDER BY series_id");
$stmt->execute();

然后在显示结果时，显示系列标题并开始一个新的 <ul>每当它改变时:

$last_series = null;
echo "<ul>\n";
while ($row = $stmt->fetch(PDO::FETCH_ASSOC)) {
    if ($row['series_id'] != $last_series) {
        if ($last_series) {
            echo "</ul></li>\n";
        }
        echo "<li>" . $row['series_id'] . " Series Product\n";
        echo "<ul>\n";
        $last_series = $row['series_id'];
    }
    echo "<li>" . $row['product_name'] . "</li>\n";
}
if ($last_series) {
    echo "</li>\n";
}
echo "</ul>\n";