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Hello,

In the Premium package you can find the following samples that use the serDataLabels option: sample_20.php and sample_22.php. For example, from sample_22.php:

$data = array(
    'legend' => array('Series 1', 'Series 2', 'Series 3'),
    'data' => array(
        array(
            'name' => 'data 1',
            'values' => array(10, 7, 5),
        ),
        array(
            'name' => 'data 2',
            'values' => array(20, 60, 3),
        ),
        array(
            'name' => 'data 3',
            'values' => array(50, 33, 7),
        ),
        array(
            'name' => 'data 4',
            'values' => array(25, 0, 14),
        ),
    ),
);
$paramsChart = array(
    'data' => $data,
    'type' => 'lineChart',
    'color' => '5',
    'chartAlign' => 'center',
    'showTable' => 0,
    'sizeX' => 12,
    'sizeY' => 10,
    'legendPos' => 'b',
    'legendOverlay' => '0',
    'haxLabel' => 'X Axis',
    'vaxLabel' => 'Y Axis',
    'haxLabelDisplay' => 'horizontal',
    'vaxLabelDisplay' => 'vertical',
    'hgrid' => '3',
    'vgrid' => '1',
    'theme' => array(
        'serDataLabels' => array(
            array(
                'showValue' => 1,
            ),
            array(
                'showValue' => 1,
            ),
            array(
                'showValue' => 1,
            ),
        ),
    ),
);
$docx->addChart($paramsChart);

And the same sample setting custom formatCode options:

$data = array(
    'legend' => array('Series 1', 'Series 2', 'Series 3'),
    'data' => array(
        array(
            'name' => 'data 1',
            'values' => array(10, 7, 5),
        ),
        array(
            'name' => 'data 2',
            'values' => array(20, 60, 3),
        ),
        array(
            'name' => 'data 3',
            'values' => array(50, 33, 7),
        ),
        array(
            'name' => 'data 4',
            'values' => array(25, 0, 14),
        ),
    ),
);
$paramsChart = array(
    'data' => $data,
    'type' => 'lineChart',
    'color' => '5',
    'chartAlign' => 'center',
    'showTable' => 0,
    'sizeX' => 12,
    'sizeY' => 10,
    'legendPos' => 'b',
    'legendOverlay' => '0',
    'haxLabel' => 'X Axis',
    'vaxLabel' => 'Y Axis',
    'haxLabelDisplay' => 'horizontal',
    'vaxLabelDisplay' => 'vertical',
    'hgrid' => '3',
    'vgrid' => '1',
    'theme' => array(
        'serDataLabels' => array(
            array(
                'showValue' => 1,
                'formatCode' => '#,##0.00',
            ),
            array(
                'showValue' => 1,
                'formatCode' => '##,##0.000',
            ),
            array(
                'showValue' => 1,
                'formatCode' => '#,##0.0000',
            ),
        ),
    ),
);

Please note that a Premium package must be used to apply theme options such as serDataLabels.

Regards.