Finally i realy don't understand what i ve to do :)  sorry !

where i've to put this :

var_dump($sxml->Row);
var_dump($sxml2->Row);

thx for your help !

<html>
  <head>
    <script type="text/javascript" 
src="https://www.google.com/jsapi";></script>
    <script type="text/javascript">
    google.load('visualization', '1', {packages: ['corechart']});
    google.setOnLoadCallback(drawChart);

    function drawChart () {
    var data = new google.visualization.DataTable();
    data.addColumn('string', 'heures');
    data.addColumn('number', 'today');
    data.addColumn('number2', 'yesterday');

   <?php
    $sxml = simplexml_load_file('graph.xml');
    $sxml2 = simplexml_load_file('graphier.xml');
    foreach ($sxml->Row as $hey=>$row){
        echo "data.addRow([ '{$row[Dim1]}', {$row[Metric1]} , 
{$sxml2->Row[$hey][Metric1]}]);";
    }
?>

      var options = {
          title: 'test',
          hAxis: {title: 'heures',  titleTextStyle: {color: 'red'}}
        };

      }
    </script>


  </head>
  <body>
    <div id="chart_div" style="width: 900px; height: 500px;"></div>
  </body>
</html>

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