Flexform::parse() 

\nn\t3::Flexform()->parse($xml = ''); 

Converts a Flexform XML into an array

\nn\t3::Flexform()->parse('');
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Also exists as a ViewHelper:

{rawXmlString->nnt3:parse.flexForm()->f:debug()}
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| @return array

Source Code 

public function parse( $xml = '' )
{
	$flexFormService = \nn\t3::injectClass( \TYPO3\CMS\Core\Service\FlexFormService::class );
	if (!$xml) return [];
	if (is_array($xml)) {
		$data = [];
		foreach (($xml['data']['sDEF']['lDEF'] ?? []) as $k=>$node) {
			$data[$k] = $node['vDEF'];
		}
		return $data;
	}
	return $flexFormService->convertFlexFormContentToArray( $xml ) ?: [];
}
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