Problem getting JSON variable from another file - php

Question

I'm trying to get an Object from my file called load.php, I'm trying to get the information from load.php every 5s. For some reason, I could make one part of it, but I can't seem to get the other variable.
<script type="text/javascript" src="jquery-3.4.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function (){
setInterval(function () {
$.getJSON('load.php', function(sensors) {
if (sensors)
{
$('#p0-blocoCorrente').text(sensors.sensor1);
$('#p1-blocoCorrente').text(sensors.sensor2);
$('#p2-blocoCorrente').text(sensors.sensor3);
//Error here:
$('#p3-blocoCorrente').text(soma);
}
});
}, 5000);
});
</script>
This is my load.php file:
<?php
session_start();
include_once 'includes/dbh.inc.php';
$soma = 0;
$id = $_SESSION['userId'];
$dBname = "infosensor";
$conn = mysqli_connect($servername, $dBUsername, $dBPassword, $dBname);
$sql = "SELECT sensor1, sensor2, sensor3 FROM `$id` ORDER BY id DESC LIMIT 1;";
$result = mysqli_query($conn, $sql);
$row = mysqli_fetch_assoc($result);
$sensors = array();
if($row)
{
for ($i = 1; $i <= 3; $i++) {
$s1 = $row["sensor$i"];
$ss1 = intval($s1 * ($p = pow(10, 2))) / $p;
$soma += $row["sensor$i"];
$sensors["sensor$i"] = $ss1 . "A";
}
echo json_encode($sensors);
} else {
echo json_encode(null);
}
?>

Answer 1

In the PHP add soma to the array before json'ing it
<?php
session_start();
include_once 'includes/dbh.inc.php';
$soma = 0;
$id = $_SESSION['userId'];
$dBname = "infosensor";
$conn = mysqli_connect($servername, $dBUsername, $dBPassword, $dBname);
$sql = "SELECT sensor1, sensor2, sensor3 FROM `$id` ORDER BY id DESC LIMIT 1;";
$result = mysqli_query($conn, $sql);
$row = mysqli_fetch_assoc($result);
$sensors = array();
if($row) {
for ($i = 1; $i <= 3; $i++) {
$s1 = $row["sensor$i"];
$ss1 = intval($s1 * ($p = pow(10, 2))) / $p;
$soma += $row["sensor$i"];
$sensors["sensor$i"] = $ss1 . "A";
}
// add soma to the array
$sensors['soma'] = $soma;
echo json_encode($sensors);
} else {
echo json_encode(null);
}
?>
Then in the javascript, get it out to whereever you want to place it
<script type="text/javascript" src="jquery-3.4.1.min.js"></script>
<script type="text/javascript">
$(document).ready(function (){
setInterval(function () {
$.getJSON('load.php', function(sensors) {
if (sensors) {
$('#p0-blocoCorrente').text(sensors.sensor1);
$('#p1-blocoCorrente').text(sensors.sensor2);
$('#p2-blocoCorrente').text(sensors.sensor3);
$('#p3-blocoCorrente').text(sensors.soma);
}
});
}, 5000);
});
</script>