用于json输出的php嵌套数组

我在3个表上运行查询，并尝试将结果格式化为嵌套数组。是内部阵列让我难堪。sizes数组应在beer数组对象中，但在其外部。谢谢你的帮助

JSON

PHP

---

你似乎在某个时候误入歧途，从那一刻起就错了

$result = $func->getBrewers(); 
$json_response = array(); 
while ($row = mysqli_fetch_array($result))
{
    $row_array = array(
        'brewerId'   => $row['brewerId'],
        'brewerName' => $row['brewerName'],
        'beers'      => array()
    );

    $brewer_pk = $row['brewerId'];  
    $beer_qry = $func->getBeers($brewer_pk);
    while ($beer_fet = mysqli_fetch_array($beer_qry))
    {
        $tmp = array(
            'beerid'      => $beer_fet['beerid'],
            'productName' => $beer_fet['productName'],
            'ibu'         => $beer_fet['ibu'],
            'abc'         => $beer_fet['abv'],
            'notes'       => $beer_fet['notes'],
            'style'       => $beer_fet['style'],
            'sizes'       => array()
        );

        $beer_pk = $tmp['beerid'];
        $size_qry = $func->getSizes($beer_pk);
        while ($size_fet = mysqli_fetch_array($size_qry))
        {
            $tmp['sizes'][] = array(
                'beerId' => $size_fet['beerId'],
                'size'   => $size_fet['size'],
            );
        }

        $row_array['beers'][] => $tmp;
    }

    array_push($json_response, $row_array);
}

echo json_encode($json_response);

为了在某种程度上简化引用，我重写了将在

$tmp

变量中创建的啤酒，该变量现在还有一个

'size'

数组，其中将附加各种大小。 添加啤酒和尺寸后，

$tmp

将添加到啤酒中

---

请注意，您现在将执行更多的数据库查询，因为它现在（根据请求）将获取每杯啤酒的大小，而不仅仅是最后一杯啤酒的大小。

这种方法的性能和可伸缩性非常耗时。在解析返回的行时，运行单个联接查询并构建嵌套。

    $result = $func->getBrewers(); 
    $json_response = array(); 
    while ($row = mysqli_fetch_array($result))
    {
        $row_array = array();
        $row_array['brewerId'] = $row['brewerId'];        
        $row_array['brewerName'] = $row['brewerName'];
        $row_array['beers'] = array();
        $brewer_pk = $row['brewerId'];  

        $beer_qry = $func->getBeers($brewer_pk);
        while ($beer_fet = mysqli_fetch_array($beer_qry))
        {
            $row_array['beers'][] = array(
            'beerid' => $beer_fet['beerid'],
            'productName' => $beer_fet['productName'],
            'ibu' => $beer_fet['ibu'],
            'abv' => $beer_fet['abv'],
            'notes' => $beer_fet['notes'],
            'style' => $beer_fet['style'],

        );

        $beer_pk = $beer_fet['beerid'];
        $size_qry = $func->getSizes($beer_pk);
        while ($size_fet = mysqli_fetch_array($size_qry))
        {
            $row_array['sizes'][] = array(
            'beerId' => $size_fet['beerId'],
            'size' => $size_fet['size'],
            );
        }
    }

    array_push($json_response, $row_array);
    }
    echo json_encode($json_response);

$result = $func->getBrewers(); 
$json_response = array(); 
while ($row = mysqli_fetch_array($result))
{
    $row_array = array(
        'brewerId'   => $row['brewerId'],
        'brewerName' => $row['brewerName'],
        'beers'      => array()
    );

    $brewer_pk = $row['brewerId'];  
    $beer_qry = $func->getBeers($brewer_pk);
    while ($beer_fet = mysqli_fetch_array($beer_qry))
    {
        $tmp = array(
            'beerid'      => $beer_fet['beerid'],
            'productName' => $beer_fet['productName'],
            'ibu'         => $beer_fet['ibu'],
            'abc'         => $beer_fet['abv'],
            'notes'       => $beer_fet['notes'],
            'style'       => $beer_fet['style'],
            'sizes'       => array()
        );

        $beer_pk = $tmp['beerid'];
        $size_qry = $func->getSizes($beer_pk);
        while ($size_fet = mysqli_fetch_array($size_qry))
        {
            $tmp['sizes'][] = array(
                'beerId' => $size_fet['beerId'],
                'size'   => $size_fet['size'],
            );
        }

        $row_array['beers'][] => $tmp;
    }

    array_push($json_response, $row_array);
}

echo json_encode($json_response);