Question

我正在学习php。

我有一个mysql查询选择函数。

比我在foreach列表中使用它..

但只有当foreach在函数内部时它才有效。我不知道如何让它在功能之外工作..

我做错了什么？

没有工作代码：

function volaco ()
{
$query = $db->getQuery(true);

$query = "select a.id, count(i.id) as all_items, a.name,  SUM(i.state = '1') published, SUM(i.state = '0') unpublished"
    . " FROM item as i"
    . " JOIN application a ON a.id = i.application_id"
    . " group by i.application_id";

$db->setQuery($query);

$apps= $db->loadObjectList();

}

$apps = volaco();
?>

    <table >
        <?php if (count($apps)) : foreach ($apps as $app) : ?>
            <tr >
                <td  width="40%"><?php echo $app->name; ?></td>
                <td  width="20%" style="text-align: center;"><?php echo $app->all_items;?></td>
                <td  width="20%" style="text-align: center;"><?php echo $app->published; ?></td>
                <td  width="20%" style="text-align: center;"><?php echo $app->unpublished; ?></td>
            </tr>
        <?php endforeach; else : ?>
<?php endif; ?>
    </table>

非常感谢

Answer 1

您正在运行volaco()需要返回类型

return $apps= $db->loadObjectList();

阅读Returning values

Answer 2

在你的volaco（）函数中添加一个返回值，$ apps超出范围。

function volaco ()
        {
        $query = $db->getQuery(true);

        $query = "select a.id, count(i.id) as all_items, a.name,  SUM(i.state = '1') published, SUM(i.state = '0') unpublished"
            . " FROM item as i"
            . " JOIN application a ON a.id = i.application_id"
            . " group by i.application_id";

        $db->setQuery($query);

        return $db->loadObjectList();
        ?>

Answer 3

试试这个：

function volaco ()
{
$query = $db->getQuery(true);

$query = "select a.id, count(i.id) as all_items, a.name,  SUM(i.state = '1') published, SUM(i.state = '0') unpublished"
    . " FROM item as i"
    . " JOIN application a ON a.id = i.application_id"
    . " group by i.application_id";

$db->setQuery($query);

$apps= $db->loadObjectList();
return $apps; 

}

$apps = volaco();
?>

    <table >
        <?php if (count($apps)) : foreach ($apps as $app) : ?>
            <tr >
                <td  width="40%"><?php echo $app->name; ?></td>
                <td  width="20%" style="text-align: center;"><?php echo $app->all_items;?></td>
                <td  width="20%" style="text-align: center;"><?php echo $app->published; ?></td>
                <td  width="20%" style="text-align: center;"><?php echo $app->unpublished; ?></td>
            </tr>
        <?php endforeach; else : ?>
<?php endif; ?>
    </table>

php foreach函数外

3 个答案: