我已经把头发拉了几天试图将一些数据组织成适当的JSON格式,以便可以在HighCharts图中绘制。
我的计划是执行一个jQuery函数来调用PHP脚本,该脚本从MySQL数据库中提取几列天气数据。我可以重新编写JavaScript方面的数据,但是希望在PHP中完成所有数据组织,然后将一个正确的JSON结构导入HighCharts引擎。
我正在查看天气数据,因此我每分钟都会抽取几列数据。我从MySQL检索的数据列是:JSTimestamp(这是JavaScript的unix时间戳* 1000),avgOutdoorTemperature,avgIndoorTemperature,avgOutdoorHumidity,avgIndoorHumidity。我已经在他们自己的数组中填充了这些列中的每一列。
我似乎无法绕过将数据操作为以下JSON /数组格式所需的PHP逻辑:
[
[
[JSTimestamp1, avgOutdoorTemperature1],
[JSTimestamp2, avgOutdoorTemperature2],
[JSTimestamp3, avgOutdoorTemperature3],
[JSTimestampN, avgOutdoorTemperatureN]
],
[
[JSTimestamp1, avgIndoorTemperature1],
[JSTimestamp2, avgIndoorTemperature2],
[JSTimestamp3, avgIndoorTemperature3],
[JSTimestampN, avgIndoorTemperatureN]
],
[
[JSTimestamp1, avgOutdoorHumidity1],
[JSTimestamp2, avgOutdoorHumidity2],
[JSTimestamp3, avgOutdoorHumidity3],
[JSTimestampN, avgOutdoorHumidityN]
],
[
[JSTimestamp1, avgIndoorHumidity1],
[JSTimestamp2, avgIndoorHumidity2],
[JSTimestamp3, avgIndoorHumidity3],
[JSTimestampN, avgIndoorHumidityN]
]
]
我用虚拟数据填充了上面的结构,它在HighCharts中绘制得很漂亮。这是一个示例演示,展示了图形的外观:http://highcharts.com/jsbin/afutef/11/edit#javascript,live
我目前的代码是:
<?php
include_once('./include/mysqldatabase.php');
include_once('./include/mysqlresultset.php');
date_default_timezone_set('America/New_York');
$MYSQL_HOST = 'ip_address';
$MYSQL_USER = 'username';
$MYSQL_PASS = 'password';
$MYSQL_NAME = 'weatherdata';
$db = MySqlDatabase::getInstance();
try {
$conn = $db->connect($MYSQL_HOST, $MYSQL_USER, $MYSQL_PASS, $MYSQL_NAME);
}
catch (Exception $e) {
die($e->getMessage());
}
$query = "
select
RecDate,
unix_timestamp(RecDateTime)*1000 as JSTime,
avgOutdoorTemperature,
avgIndoorTemperature,
avgOutdoorHumidity,
avgIndoorHumidity
from `rollup-minute-60`
where
RecDate > 201301010000
";
$timeArray = array();
$avgOutdoorTemperatureArray = array();
$avgIndoorTemperatureArray = array();
$combinedArray = array();
$i = 0;
$seriesNames = array('Average Outdoor Temperature','Average Indoor Temperature', 'Average Outdoor Humidity', 'Average Indoor Humidity');
foreach ($db->iterate($query) as $r) {
$jstime = $r->JSTime;
$avgOutdoorTemperature = $r->avgOutdoorTemperature;
$avgIndoorTemperature = $r->avgIndoorTemperature;
$avgOutdoorHumidity = $r->avgOutdoorHumidity;
$avgIndoorHumidity = $r->avgIndoorHumidity;
$timeArray[$i] = (float)$jstime;
$avgOutdoorTemperatureArray[$i] = (float)$avgOutdoorTemperature;
$avgIndoorTemperatureArray[$i] = (float)$avgIndoorTemperature;
$avgOutdoorHumidityArray[$i] = (float)$avgOutdoorHumidity;
$avgIndoorHumidityArray[$i] = (float)$avgIndoorHumidity;
$combinedArray[$i] = array((float)$avgOutdoorTemperature, (float)$avgIndoorTemperature, (float)$avgOutdoorHumidity, (float)$avgIndoorHumidity);
$i++;
}
echo "Combined array:<br>";
echo json_encode($combinedArray);
echo "<br><br><br>";
echo "Time array:<br>";
echo json_encode($timeArray);
echo "<br><br><br>";
$arraySize = sizeof($timeArray);
$seriesNameSize = sizeof($seriesNames);
$outputJSONArray = array();
$tempArray = array();
for ($i=0; $i<$seriesNameSize; $i++) {
for ($j=0; $j<$arraySize; $j++) {
$tempArray = array();
array_push($tempArray, $timeArray[$j], $combinedArray[$j][$i]);
echo "i=".$i.", j=".$j.", tempArray: " . json_encode($tempArray) ."<br>";
$outputJSONArray[$i] = $tempArray;
}
}
echo json_encode($outputJSONArray);
?>
使用上面的当前代码,我的输出数组只显示$ outputJSONArray中的最后一个元素而不是多维构造。
任何人都可以帮我指出正确的方向吗?我在这个网站上找到了很多很好的信息,以帮助我开始,但需要一些帮助来克服最后的障碍。
谢谢!
答案 0 :(得分:1)
检查Highcharts常见问题解答:http://docs.highcharts.com/#preprocessing-data-from-a-database 第二个例子告诉你如何做到这一点:
<?php
while ($row = mysql_fetch_array($result)) {
extract $row;
$datetime *= 1000; // convert from Unix timestamp to JavaScript time
$data[] = "[$datetime, $value]";
}
?>
var chart = new Highcharts.Chart({
chart: {
renderTo: 'container'
},
series: [{
data: [<?php echo join($data, ',') ?>]
}]
});
答案 1 :(得分:0)
感谢您回复Paweł。我一直在使用您发布的示例,并且对单个时间序列非常了解。然而,我对多个系列的正确格式化感到困惑。
我努力操纵PHP端的数据以正确的格式获取数据:
[
[
[time1, y1],
[time2, y2],
[time3, y3]
]
[
[time1, z1],
[time2, z2],
[time3, z3]
]
[
...
]
]
然而,在今天早些时候玩完东西并最终在白板上绘制解决方案后,我发现了一个似乎有效的解决方案,并要求我为每个系列遍历收集的数据阵列一次。它可能不是最佳的,但适用于我测试的几千点。这是我的参考代码:
$seriesNames = array('Average Outdoor Temperature','Average Indoor Temperature');
foreach ($db->iterate($query) as $r) {
$time = (float)$r->RecDateTime;
$jstime = (float)($r->Timestamp*1000);
$avgOutdoorTemperature = (float)$r->avgOutdoorTemperature;
$avgIndoorTemperature = (float)$r->avgIndoorTemperature;
$dataArray[] = array(array($jstime, $avgOutdoorTemperature), array($jstime, $avgIndoorTemperature));
}
$arraySize = sizeof($dataArray);
$seriesNameSize = sizeof($seriesNames);
for ($i=0; $i<$seriesNameSize; $i++) {
$tempArray = array();
for ($j=0; $j<$arraySize; $j++) {
$tempArray[] = $dataArray[$j][$i];
}
$outputJSONArray[] = $tempArray;
}
echo json_encode($outputJSONArray);
我想我可以执行多个查询并手动添加每个系列,但我最终打算使用的查询相当密集,并且更愿意只调用一次。