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Hello,

You need to use the htmlentities function when you need to add a protected character such as & or <.

For example:

$data = array(
    htmlentities('data &1') => array(20),
    'data 2' => array(20),
    'data 3' => array(50),
    'data 4' => array(25),
    'data 5' => array(5),
);

$paramsChart = array(
    'data' => $data,
    'type' => 'doughnutChart',
    'showPercent' => true,
    'explosion' => 10,
    'holeSize' => 25,
    'sizeX' => 12,
    'sizeY' => 10,
    'chartAlign' => 'center',
    'color' => '2',
    'legendPos' => 'r',
    'legendOverlay' => true,
    'showTable' => true,
);
$docx->addChart($paramsChart);

Regards.