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Hello,

You need to use the same data structure than the addChart method for each chart type. For example, for the piechart generated by the included sample Core/addChart/sample_1.php, you can replace the data using this code:

$data = array();
$data[0] = array(
    'title' => 'New title',
    'values' => array(
        array(30),
        array(30),
        array(40),
    ),
);
$data[1] = array(
    'title' => 'Other title',
    'values' => array(
        array(50),
        array(40),
        array(30),
    ),
);

$docx->replaceChartData($source, $target, $data);

Regards.