Obj::isFile() 

\nn\t3::Obj()->isFile($obj); 

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

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

Source Code 

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