How to load an array of external data in QuickChart?-CodePudding

I am looking to use QuickChart in my PHP project. I skimmed the documentation completely. But, everything in it has the data being statically loaded as an array. I am trying to load external data, that is generated from somewhere else, into the chart. To understand QuickChart, I tried to load data dynamically in the examples provided in the documentation.

<?php
require_once('QuickChart.php');  //the QuickChart.php file is copied in the same folder as this file.

$qc = new QuickChart();
$data = array(50, 60, 70, 180);  //loading data dynamically.
$qc->setConfig("{
  type: 'bar',
  data: {
    labels: ['Q1', 'Q2', 'Q3', 'Q4'],
    datasets: [{
      label: 'Users',
      data: $data  //line with error.
    }]
  }
}");

$a = $qc->getUrl();
$imageData = base64_encode(file_get_contents($a));
echo '<img src="data:image/jpeg;base64,'.$imageData.'">';
?>

But, there is an error as follows.

Notice: Array to string conversion in C:\xampp\htdocs\quickChart\index.php on line 12

Following is the example which I modified.

<?php
  require_once('../QuickChart.php');

  $qc = new QuickChart();
  $qc->setConfig("{
    type: 'bar',
    data: {
      labels: ['Q1', 'Q2', 'Q3', 'Q4'],
      datasets: [{
        label: 'Users',
        data: [50, 60, 70, 180]
      }]
    }
  }");

  echo $qc->getUrl();
?>

I searched for a while on Internet, but it looks like QuickChart isn't as popular, so there aren't many sources to read. What is the solution in this case?

CodePudding user response：

That looks like a JSON String representaion of an array so for example

$jj = json_encode([50, 60, 70, 180]);

$qc->setConfig("{
    type: 'bar',
    data: {
      labels: ['Q1', 'Q2', 'Q3', 'Q4'],
      datasets: [{
        label: 'Users',
        data: $jj
      }]
    }
  }";