Question

我需要使用highcharts创建basic column chart。这是我的PHP代码：

$query = "SELECT campaign_id, kpi, label, val FROM table WHERE id = $1";

$result = pg_prepare($db, "report", $query);
$result = pg_execute($db, "report", array($campaignID));

while ($row = pg_fetch_array($result, NULL, PGSQL_ASSOC))
{
    $response['xlabels'][] = $row['label'];
    $response['xdata'][] = (float)$row['val'];
}

pg_free_result($result);
pg_close($db);

echo json_encode($response);

PostgreSQL查询返回如下数据（例如，campaign_id = 5）：

 id |    kpi    | label | val  
----+-----------+-------+------
  5 | Voter     | East  | 0.18 
  5 | Non-Voter | East  | 0.12 
  5 | Voter     | West  | 0.82 
  5 | Non-Voter | West  | 0.88

我的API将xlabels和xdata保存到xAxis.categories和series：

$.get('vote_api.php', {'id' : id}, function(data) {

    options.chart.type = 'column';

    options.xAxis.categories = data.xlabels;
    options.series = data.xdata;   

    chart = new Highcharts.Chart(options);

    }, "json");

kpi（选民与非选民）作为我的系列和label（东部与西部）作为我的xAxis的正确数据格式应该是（请参阅JSFiddle）：

xAxis.categories = ['East', 'West'];
series = [{name: 'Voter',
            data: [0.18, 0.82]},
          {name: 'Non-Voter',
            data: [0.12, 0.88]}]

但我的while loop部分$response['xlabels'][] = $row['label']; $response['xdata'][] = (float)$row['val'];给我这样的内容：

[xlabels] => Array
    (
        [0] => East
        [1] => East
        [2] => West
        [3] => West
    )

[xdata] => Array
    (
        [0] => 0.18
        [1] => 0.12
        [2] => 0.82
        [3] => 0.88
    )

有人会提供一些提示吗？我真的很感激!!

Answer 1

您可以尝试：

$query = "SELECT campaign_id, kpi, label, val FROM table WHERE id = $1";

$result = pg_prepare($db, "report", $query);
$result = pg_execute($db, "report", array($campaignID));

while ($row = pg_fetch_array($result, NULL, PGSQL_ASSOC))
{
    if (!in_array($row['label'], $response['xlabels']))
    {
        $response['xlabels'][] = $row['label'];
    }
    $response['xdata'][ $row['kpi'] ][] = (float)$row['val'];
}

pg_free_result($result);
pg_close($db);

第一个变化：

    if (!in_array($row['label'], $response['xlabels']))
    {
        $response['xlabels'][] = $row['label'];
    }

避免将“East”和“West”多次保存到xlabels数组中。

第二个变化：

    $response['xdata'][ $row['kpi'] ][] = (float)$row['val'];

将向xdata数组添加维度：根据“kpi”将值分配给不同的数组。

如何将正确的数据格式从SQL传递给PHP

1 个答案: