Chartjs-Dynamically create chart with Chart.js and PHP

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Data attribute of $dataPoints should be an array. You have to convert it if you get a single value

...
$dataPoints = array(
  array( "label" => "Gold Star" , "data" => array($gold) , "backgroundColor" => "rgba(255,215,0,1)"),
  array( "label" => "Green Light" , "data" => array($green) , "backgroundColor" => "rgba(0,128,0,1)"),
  array( "label" => "Yellow Light" , "data" => array($yellow) , "backgroundColor" => "rgba(255,255,0,1)"),
  array( "label" => "Red Light" , "data" => array($red) , "backgroundColor" => "rgba(255,0,0,1)" )
);
...

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