Obj::isFalFile() 

\nn\t3::Obj()->isFalFile($obj); 

Checks whether the object is a \TYPO3\CMS\Core\Resource\FileReference.

\nn\t3::Obj()->isFalFile( $obj );
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| @return boolean

Source Code 

public function isFalFile ( $obj )
{
	if (!is_object($obj)) return false;
	if (is_a($obj, \TYPO3\CMS\Core\Resource\FileReference::class)) return true;
	return false;
}
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