How to iterate over an item of objects and array - php

Question

I do not know how to iterate on this output, it can be simple but try several methods without success.
I have the result of a query that throws a json with objects and fixes, but I can not get the cpu, memory and disk values:
<?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);
?>
and I get this output:
{"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]]}]}]}
Try for example:
foreach ($res as $test) {
echo $test->statement_id->cpu;
}
I wish I could get this:
hostname time cpu mem load load
linux01 1970-01-01T00:00:00Z 1 78 0 0
Sorry for my bad English.

Answer 1

You will have a difficult time working with this data as is, because most of the data is unkeyed, and that makes it misleading to work with as an object. It would be easier in this case if you worked with the array. You can do this by using true as the second parameter of the decode.
$data = json_decode(curl_exec ($ch), true);
$results = $data['results'];
foreach ($results['series'] as $server) {
$cpuIndex = array_search('cpu', $server['columns']);
echo $server['values'][$cpuIndex];
}

Answer 2

You need to convert it to from JSON to an Object or Array.
Here's a common Array situation:
$results = json_decode('{"results":[{"statement_id":0,"series":[{"name":"custom","tags":{"hostname":"LINUX01"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",1,78,0,0]]},{"name":"custom","tags":{"hostname":"LINUX02"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",6,48,0,0]]},{"name":"custom","tags":{"hostname":"LINUX03"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",5,47,0,0]]},{"name":"custom","tags":{"hostname":"LINUX04"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",35,94,0,0]]},{"name":"custom","tags":{"hostname":"LINUX05"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",3,47,0,0]]},{"name":"custom","tags":{"hostname":"LINUX06"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",57,25,0,0]]},{"name":"custom","tags":{"hostname":"LINUX07"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",40,47,0,0]]},{"name":"custom","tags":{"hostname":"LINUX08"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",41,30,0,0]]},{"name":"custom","tags":{"hostname":"ues90078"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",40,20,0,0]]},{"name":"custom","tags":{"hostname":"LINUX09"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",33,45,0,0]]},{"name":"custom","tags":{"hostname":"LINUX041"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",31,30,0,0]]},{"name":"custom","tags":{"hostname":"LINUX042"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",33,8,0,0]]},{"name":"custom","tags":{"hostname":"LINUX043"},"columns":["time","cpu","mem","load","load"],"values":[["1970-01-01T00:00:00Z",54,10,0,0]]}]}]}', true);
foreach ($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>";
}
If you want something specific:
foreach ($results["results"][0]["series"] as $array) {
foreach ($array["columns"] as $key => $value) {
if ($value === "cpu") $column = $key;
}
echo "cpu: {$array["values"][0][$column]}.<br>";
}
To add hostname, simple add:
echo "<tr>";
echo "<th colspan=" . count($array["columns"]) . ">{$array["tags"]["hostname"]}</th>";
echo "</tr>";
after echo "<thead>";.