JSON to PHP: Obtaining the Object Array data within an Object

Question

I have two JavaScript classes:

function Sensor(sensorNumber, name, m, b, selected) {
    "use strict";
    this.sensorNumber = sensorNumber;
    this.name = name;
    this.m = m;
    this.b = b;
    this.selected = selected;
}

The Chart class below contains an Array of the Sensor class above, some variables, and a timeSpan class:

function Chart(index, allsensors) {
    "use strict";
    this.chartName = $("#newChartName").val();
    this.chartNumber = index;
    this.sensorsArray = allsensors;
    this.time = new TimeSpan();
}

I send the "chart" object variable to PHP via Jquery AJAX:

function obtainChartData(chart) {
    "use strict";
    $.ajax({
        url: 'server/ExtractTelemetry.php',
        type: "POST",
        data: JSON.stringify(chart),
        success: function (msg) {
            alert(msg);
        }
    });
}

PHP Receives it, and this is where I'm stuck. I need to obtain the "this.Selected" for each element in the sensor object array.

<?php
    $json = file_get_contents('php://input');
    $chart = json_decode($json);
    echo $startTime = $chart->time->startSec." "; //CORRECT
    echo $endTime = $chart->time->endSec." "; //CORRECT
    echo $chartName = $chart->chartName." "; //CORRECT
    echo $chartNumber = $chart->chartNumber." "; //CORRECT

    for(...) {
    echo $allSensors = $chart->allSensors[someIndexValue]->selected; //why does this not work??
    }
?>

UPDATE:

Here is the PHP Error output

JSON output(shortened but should be enough info):

object(stdClass)#1 (4) {  
["chartName"]=>  string(7) "Chart#1"  
["chartNumber"]=>  int(1)
["sensorsArray"]=>  object(stdClass)#2 (44) {    
    ["B0"]=>    object(stdClass)#3 (5) {      
        ["sensorNumber"]=>      int(0)      
        ["name"]=>      string(10) "SRBUS(mV)"      
        ["m"]=>      string(6) "1.2811"      
        ["b"]=>      string(8) "-4.1559"      
        ["selected"]=>      bool(false)    
        }    
    ["B1"]=>    object(stdClass)#4 (5) {
        ["sensorNumber"]=>      int(1)      
        ["name"]=>      string(10) "SRBUS(mA)"      
        ["m"]=>      string(6) "0.6137"      
        ["b"]=>...

Shouldn't that be $chart->sensorsArray[someIndexValue]->selected? — Phylogenesis
– Phylogenesis, Commented Sep 22, 2015 at 8:34
@Phylogenesis, you are correct... I fixed it, but that leads to another error. I updated the image — NutellaAddict
– NutellaAddict, Commented Sep 22, 2015 at 8:40
You'll have a lot more luck using var_dump($chart); and looking at its actual structure. — Phylogenesis
– Phylogenesis, Commented Sep 22, 2015 at 8:41

Tobias Gassmann · Accepted Answer · 2015-09-22 09:13:47Z

3

json_decode returns an stdObject. Properties of that object can be access by

$myObject = json_decode($myString);

$myObject->myProperty;

If you want an array returned from json_decode pass a secnond parameter 'true'

$myArray = json_decode($myString, true);

answered Sep 22, 2015 at 9:13

Tobias Gassmann

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2 Comments

NutellaAddict Over a year ago

That leads to this error: Notice: Trying to get property of non-object in C:\xampp\htdocs\CSUNSat1-TelemetryWebApp\CSUNSat1Telemetry\server\ExtractTelemetry.php on line 6 Notice: Trying to get property of non-object

Tobias Gassmann Over a year ago

the chart itself is an array then also: this should work: $startTime = $chart['time']['startSec'];

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