How to use a PHP variable in a JS file ?

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Hello, I hope you are well I am new to this platform. I need some help.
I have 3 files: an HTML, PHP and JS file. In my PHP file, I have a variable of type array() containing 5 values, and this variable will be used to feed a graph. However I don't know how to reuse my variable in my PHP code to my JS code.

I thank you in advance for the answers you will bring me.

What I have tried:

Here is the variable in my PHP code:

PHP

$dataSignal = array($lqi_excellent, $lqi_good, $lqi_average, $lqi_limit, $lqi_na);

Here is my js code :

JavaScript

new Chart(document.getElementById("doughnut-chart"), {
  type: 'doughnut',
  data: {
    labels: ["Excellent", "Good", "Average", "Limit", "N/A"],
    datasets: [
    {
      backgroundColor: ["#27AE60", "#3498DB", "#F1C40F", "#E74C3C", "#17202A"],
      data: [1,2,3,4,5] --> this is where I want to reuse my variable
    }
    ]
  },
  options: {
    plugins: {
      legend: {
        title: {
          display: true,
          text: 'Signal quality'
        }
      }
    }
  }
});

Posted 17-Oct-21 19:58pm

Team BODZEN

Updated 17-Oct-21 22:17pm

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Richard MacCutchan · Answer 1 · 2021-10-17T22:17:00

Since PHP runs on the server, you need to add the code into the page that will be sent to the client. Something like:

PHP

    datasets: [
    {
      backgroundColor: ["#27AE60", "#3498DB", "#F1C40F", "#E74C3C", "#17202A"],
<?php
      echo "data: [ " . $lqi_excellent . ", " . $lqi_good . ", " . $lqi_average . ", " . $lqi_limit . ", " . $lqi_na . " ]" 

?>
    }
    ]