Chartjs-Php/ajax return JSON in same form as javascript array

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What you want is to create an array of objects, then use json_encode and it should produce what you need. Try this:

$array = array();
$dataset = new stdClass;
$dataset->label = "My first dataset";
// repeat for each field
$array[] = $dataset;
echo json_encode($array);

What we can do to shorten this is rather than declare a new dataset each time we can use an array and typecast it to an object like this:

$datasets = array();
$datasets[] = (object) array(
    'label' => "My First dataset",
    'fillColor' => "rgba(220,220,220,0.2)",
    'strokeColor' => "rgba(220,220,220,1)",
    'pointColor' => "rgba(220,220,220,1)",
    'pointStrokeColor' => "#fff",
    'pointHighlightFill' => "#fff",
    'pointHighlightStroke' => "rgba(220,220,220,1)",
    'data' => [65, 59, 80, 81, 56, 55, 40]
);

Check out this eval.in for a working example.

Update

For your complete structure you need:

$data = (object) [
    'labels' => ["January", "February", "March", "April", "May", "June", "July"],
    datasets => []
];

$data->datasets[] = (object) [
    'label' => "My First dataset",
    'fillColor' => "rgba(220,220,220,0.2)",
    'strokeColor' => "rgba(220,220,220,1)",
    'pointColor' => "rgba(220,220,220,1)",
    'pointStrokeColor' => "#fff",
    'pointHighlightFill' => "#fff",
    'pointHighlightStroke' => "rgba(220,220,220,1)",
    'data' => [65, 59, 80, 81, 56, 55, 40]
];

echo json_encode($data);

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