Displaying specific users input in Google Graphs with mySQL - php

Question

Im new to php and mysql and we have a project where we want to display a specific users input in a google chart.
In the mysql table I have 2 different values (admin, test) under a row called user_name.
When the code is as I linked, the chart shows all the inputs, no matter if they are from the user "test" or the user "admin" and works as it should.
But when I change
$query="
select *
from temp
"
to
$query=
"select *
from temp
where user_name=test
"
the chart stops working.
Any help how to solve this is much appreciated!
<!-- The scripts for the graph -->
<script type="text/javascript"
src="https://www.gstatic.com/charts/loader.js"></script>
<script type="text/javascript">
google.charts.load('current', {'packages':['corechart']});
google.charts.setOnLoadCallback(drawChart);
function drawChart() {
var data = google.visualization.arrayToDataTable([
['Day', 'Outdoor', 'Indoor'],
//PHP Code
<?php
$query="select * from temp";
$res=mysqli_query($mysqli,$query);
while($data=mysqli_fetch_array($res)){
$day=$data['created_at'];
$outdoor=$data['outdoor'];
$indoor=$data['indoor'];
?>
['<?php echo $day;?>',<?php echo $outdoor;?>,
<?php echo $indoor;?>],
<?php
}
?>
]);
var options = {
title: 'Temperature',
subtitle: 'Temperature outside and inside',
curveType: 'none',
legend: { position: 'bottom' }
};
var chart = new google.visualization.LineChart
(document.getElementById('curve_chart'));
chart.draw(data, options);
}
</script>
mysql table: