PHP在一页上多次执行数组

Question

我想在一页上运行两个单独的foreach循环，但是只编写一次SQL。 例如，请参见下面的代码，只有具有首次运行ID的ul，第二个ul为空。

    <?php
        $mylist = 'SELECT * FROM myTable';
        $showlist = $pdo->prepare($mylist);
        $showlist->execute();
    ?>  
    <ul id="first">
        <?php foreach ($showlist as $rowid):;?>
            <li><?php echo $rowid['id'] ?></li>
        <?php endforeach; ?>  
    </ul>
    <ul id="second">
        <?php foreach ($showlist as $rowname):;?>
            <li><?php echo $rowname['name'] ?></li>
        <?php endforeach; ?>  
    </ul>

我以为重命名as可以让我再次使用它，但事实并非如此？ 最好的方法是什么？

Answer 1

尝试：

<?php
$mylist = 'SELECT * FROM myTable';
$showlist = $pdo->prepare($mylist);
$showlist->execute();
$result = $showlist->fetchAll();

foreach ($result as $rowid) {
    // do stuff
}

foreach ($result as $rowname) {
    // do stuff
}

Answer 2

您需要先将元素堆叠在一个额外的数组中：

$mylist = 'SELECT * FROM myTable';
$showlist = $pdo->prepare($mylist);
$showlist->execute();

$rows = array();

foreach($showlist as $row) {
    array_push($rows, $row);
}

echo "<ul>";
foreach($rows as $row) {
    echo "<li>".$row['id']."</li>";
}
echo "</ul><ul>";
foreach($rows as $row) {
    echo "<li>".$row['name']."</li>";
}
echo "</ul>";