如何迭代对象和数组项

Posted 2021-04-01

我不知道如何迭代这个输出，它可以很简单，但尝试几种方法没有成功。

我有一个查询的结果，抛出一个带有对象和修复的json，但我无法获得cpu，内存和磁盘值：

<?php
// How to read influx data with curl
$query = urlencode("select * from calls limit 1");
$ch = curl_init();
curl_setopt($ch, CURLOPT_TIMEOUT, 1); //timeout in seconds
curl_setopt($ch, CURLOPT_URL,"http://127.0.0.1:8086/query?db=myDB&q=$query");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, TRUE);
$res =  json_decode(curl_exec ($ch));
curl_close ($ch);
var_dump($res);
?>

我得到这个输出：

{"results":[{"statement_id":0,"series":[{"name":"custom","tags":{"hostname":"LINUX01"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",1,78,0,0]]},{"name":"custom","tags":{"hostname":"LINUX02"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",6,48,0,0]]},{"name":"custom","tags":{"hostname":"LINUX03"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",5,47,0,0]]},{"name":"custom","tags":{"hostname":"LINUX04"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",35,94,0,0]]},{"name":"custom","tags":{"hostname":"LINUX05"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",3,47,0,0]]},{"name":"custom","tags":{"hostname":"LINUX06"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",57,25,0,0]]},{"name":"custom","tags":{"hostname":"LINUX07"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",40,47,0,0]]},{"name":"custom","tags":{"hostname":"LINUX08"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",41,30,0,0]]},{"name":"custom","tags":{"hostname":"ues90078"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",40,20,0,0]]},{"name":"custom","tags":{"hostname":"LINUX09"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",33,45,0,0]]},{"name":"custom","tags":{"hostname":"LINUX041"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",31,30,0,0]]},{"name":"custom","tags":{"hostname":"LINUX042"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",33,8,0,0]]},{"name":"custom","tags":{"hostname":"LINUX043"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",54,10,0,0]]}]}]}

试试例子：

foreach ($res as $test) {
     echo $test->statement_id->cpu;
}

我希望我能得到这个：

hostname         time            cpu    mem load    load
linux01   1970-01-01T00:00:00Z    1      78   0       0

对不起，我的英语不好。

答案

您将很难处理这些数据，因为大多数数据都是未加密的，这使得它作为对象使用起来会产生误导。如果使用数组，在这种情况下会更容易。您可以使用true作为解码的第二个参数来完成此操作。

$data =  json_decode(curl_exec ($ch), true);

$results = $data['results'];

foreach ($results['series'] as $server) {
    $cpuIndex = array_search('cpu', $server['columns']);
    echo $server['values'][$cpuIndex];
}

另一答案

您需要将其转换为JSON到Object或Array。

这是一个常见的Array情况：

$results = json_decode('{"results":[{"statement_id":0,"series":[{"name":"custom","tags":{"hostname":"LINUX01"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",1,78,0,0]]},{"name":"custom","tags":{"hostname":"LINUX02"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",6,48,0,0]]},{"name":"custom","tags":{"hostname":"LINUX03"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",5,47,0,0]]},{"name":"custom","tags":{"hostname":"LINUX04"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",35,94,0,0]]},{"name":"custom","tags":{"hostname":"LINUX05"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",3,47,0,0]]},{"name":"custom","tags":{"hostname":"LINUX06"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",57,25,0,0]]},{"name":"custom","tags":{"hostname":"LINUX07"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",40,47,0,0]]},{"name":"custom","tags":{"hostname":"LINUX08"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",41,30,0,0]]},{"name":"custom","tags":{"hostname":"ues90078"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",40,20,0,0]]},{"name":"custom","tags":{"hostname":"LINUX09"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",33,45,0,0]]},{"name":"custom","tags":{"hostname":"LINUX041"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",31,30,0,0]]},{"name":"custom","tags":{"hostname":"LINUX042"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",33,8,0,0]]},{"name":"custom","tags":{"hostname":"LINUX043"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",54,10,0,0]]}]}]}', true);

foreach ($results["results"][0]["series"] as $array) {

  echo "<table>";
  echo "<thead>";

  echo "<tr>";
  foreach ($array["columns"] as $value) {
    echo "<th>{$value}</th>";
  }
  echo "</tr>";

  echo "</thead>";
  echo "<tbody>";

  echo "<tr>";
  foreach ($array["values"][0] as $value) {
    echo "<td>{$value}</td>";
  }
  echo "</tr>";

  echo "</tbody>";
  echo "<table>";

}

如果你想要特定的东西：

foreach ($results["results"][0]["series"] as $array) {

  foreach ($array["columns"] as $key => $value) {
    if ($value === "cpu") $column = $key;
  }

  echo "cpu: {$array["values"][0][$column]}.<br>";

}

要添加主机名，请添加：

echo "<tr>";
echo "<th colspan=" . count($array["columns"]) . ">{$array["tags"]["hostname"]}</th>";
echo "</tr>";

在echo "<thead>";之后。