code: public function current()
  	{
  		if( $this->iterator->valid() === false ) {
  			return null;
  		}
  
  		$iterator = $this->iterator->current()->getCellIterator();
  		$iterator->setIterateOnlyExistingCells( false );
  
  		$result = [];
  
  		foreach( $iterator as $cell ) {
  			$result[] = $cell->getValue();
  		}
  
  		return $result;
  	}
docs: Return the current row.
  
  @return array List of values