如何迭代對象和數組的項

Question

我不知道如何迭代此輸出，它可能很簡單，但是嘗試幾種方法卻沒有成功。

我有一個查詢的結果，該查詢拋出帶有對象和修復程序的json，但是我無法獲取cpu，內存和磁盤值：

<?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);
?>

我得到以下輸出：

{"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]]}]}]}

嘗試例如：

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

我希望我能得到這個：

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

對不起，我的英語不好。

Answer 1

您將很難按原樣使用這些數據，因為大多數數據都是未加密的，這使其誤導為對象。 如果使用數組，在這種情況下會更容易。 您可以通過使用true作為解碼的第二個參數來實現。

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

$results = $data['results'];

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

Answer 2

您需要將其從JSON轉換為對象或數組。

這是常見的陣列情況：

$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>";

}

如果您想要特定的東西：

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>";

}

要添加主機名，只需添加：

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

echo "<thead>"; 。