google.charts.load("current", {packages:["corechart"]});;
  google.charts.setOnLoadCallback(drawChart);

  function drawChart()
  {
   var data = google.visualization.arrayToDataTable([
    ['classificacao','Number'],
    <?php
    while ($row=mysqli_fetch_array($result))
    {
      echo "['".$row["classificacao"]."', ".$row["number"]."],";
    }
    ?>
    ]);
   var options = {
    title:'Classificações do refeitório',
    is3D:true
  };
  var chart = new google.visualization.PieChart(document.getElementById('piechart'));
  chart.draw(data,options);
}