public function getNodeAt($position) {
        if (0 <= $position && $position <= count($this->nodes) - 1) {
            return $this->nodes[$position];
        }
        return null;
    }
public function getNodeAt($position) {
        if (0 <= $position && $position <= count($this->nodes) - 1) {
            return $this->nodes[$position];
        }
        return null;
    }
public function getNodeAt ( $ position ) { if ( 0 <= $ position && $ position <= count ( $ this -> nodes ) - 1 ) { return $ this -> nodes [ $ position ] ; } return null ; }
Get a node at position.

@param int $position The position.
@return AbstractNode Returns the node in case of success, null otherwise.
Get a node at position .