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Hello,

The current stable version of phpdocx doesn't include an option to set custom color symbols. A new option must be added (symbolRgbColors or a similar option name). It's currently being developed and it will be included in the next stable release of phpdocx (there's no release date).

Regarding the PHP error you get, it comes from a not supported theme option when generating combo charts. In this case, please do not create custom color for values, only for series:

$paramsChart = array(
    'data' => $data,
    'type' => 'lineChart',
    'symbol' => 'dot',
    'symbolSize' => 5,
    'smooth' => false,
    'returnChart' => true,
    'color' => 2,
    'theme' => array(
        'serRgbColors' => array('00b546','fa7d0f'),
    ),
);

We have opened a task to the dev team to support setting custom color to individual values when adding a combo chart.

Regards.