Obj::parseType() 

\nn\t3::Obj()->parseType($paramType = ''); 

Parse a string with information about ObjectStorage.

\nn\t3::Obj()->parseType( 'string' );
\nn\t3::Obj()->parseType( 'Nng\Nnrestapi\Domain\Model\ApiTest' );
\nn\t3::Obj()->parseType( '\TYPO3\CMS\Extbase\Persistence\ObjectStorage' );
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Git an array with information back: | type is only set if it is an array or an ObjectStorage. | elementType is always the type of the model or the TypeHinting of the variable

[
    'elementType' => 'Nng\Nnrestapi\Domain\Model\ApiTest',
    'type' => 'TYPO3\CMS\Extbase\Persistence\ObjectStorage',
    'simple' => FALSE
]
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| @return array

Source Code 

public function parseType( $paramType = '' )
{
	if (!$paramType || !trim($paramType)) {
		return ['elementType'=>'', 'type'=>'', 'simple'=>true ];
	}
	if (class_exists(TypeHandlingUtility::class)) {
		$typeInfo = \TYPO3\CMS\Extbase\Utility\TypeHandlingUtility::parseType( $paramType );
	} else {
		preg_match( '/([^<]*)<?([^>]*)?>?/', $paramType, $type );
		$typeInfo = [
			'elementType' => ltrim($type[2], '\\'),
			'type' => ltrim($type[1], '\\')
		];
	}
	if (!$typeInfo['elementType']) {
		$typeInfo['elementType'] = $typeInfo['type'];
		$typeInfo['type'] = '';
	}
	$typeInfo['simple'] = $this->isSimpleType($typeInfo['elementType']);
	return $typeInfo;
}
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