Преобразовать массив

 
 
    [09] => Array
        (
            [0] => 1654
            [1] => 1764
        )
 
    [10] => Array
        (
            [0] => 1625
            [1] => 1732
        )
 
 

 
[09, 1654, 1764]
[10, 1625, 1732]
 

$result = [];
 
foreach ($array as $key => $values) {
 
    $item = [$key];
 
    foreach ($values as $value) {
        $item[] = $value;
    }
 
    $result[] = $item;
}
 
print_r($result);

foreach ($array as $key => $values) {
    $result[] = explode(',', $key.','.implode(',', $values));
}

 
 
      data.addRows([
        [1,  1200, 80.8],
        [2,  30.9, 69.5],
        [3,  25.4,   57],
        [4,  11.7, 18.8],
        [5,  11.9, 17.6],
        [6,   8.8, 13.6],
        [7,   7.6, 12.3],
        [8,  12.3, 29.2],
        [9,  16.9, 42.9],
        [10, 12.8, 30.9],
        [11,  5.3,  7.9],
        [12,  6.6,  8.4],
        [13,  4.8,  6.3],
        [14,  4.2,  6.2],
        [16,  0.2,  3.5]
      ]);
 
 

foreach ($array as $key => $values) {
    $result[] = '['.$key.','.implode(',', $values).']';
}

Array
(
    [0] => [9,1654,1764]
    [1] => [10,1625,1732]
)

data.addRows(<?php echo json_encode($result); ?>);

foreach ($array as $key => $values) {
    $result[] = '['.$key.','.implode(',', $values).']';
}
$addrows = 'data.addRows(['.implode(',', $result).']);'; // $addrows используйте, где надо

data.addRows([[9,1654,1764],[10,1625,1732]]);

 
 
      google.charts.load('current', {'packages':['line']});
      google.charts.setOnLoadCallback(drawChart);
 
    function drawChart() {
 
      var data = new google.visualization.DataTable();
      data.addColumn('number', 'Day');
      data.addColumn('number', 'Guardians of the Galaxy');
      data.addColumn('number', 'The Avengers');
      data.addColumn('number', 'Transformers: Age of Extinction');
 
      data.addRows([
        [1,  37.8, 80.8, 41.8],
        [2,  30.9, 69.5, 32.4],
        [3,  25.4,   57, 25.7],
        [4,  11.7, 18.8, 10.5],
        [5,  11.9, 17.6, 10.4],
        [6,   8.8, 13.6,  7.7],
        [7,   7.6, 12.3,  9.6],
        [8,  12.3, 29.2, 10.6],
        [9,  16.9, 42.9, 14.8],
        [10, 12.8, 30.9, 11.6],
        [11,  5.3,  7.9,  4.7],
        [12,  6.6,  8.4,  5.2],
        [13,  4.8,  6.3,  3.6],
        [14,  4.2,  6.2,  3.4]
      ]);
 
      var options = {
        chart: {
          title: 'Box Office Earnings in First Two Weeks of Opening',
          subtitle: 'in millions of dollars (USD)'
        },
        width: 900,
        height: 500
      };
 
      var chart = new google.charts.Line(document.getElementById('linechart_material'));
 
      chart.draw(data, google.charts.Line.convertOptions(options));
    }
 
 

     data.addRows([
        [1,  37.8, 80.8, 41.8]...