public function readVarint() {
        list($higher, $lower) = array_values(unpack('N2', $this->data));
        return $higher << 32 | $lower;
    }
public function readVarint() {
        list($higher, $lower) = array_values(unpack('N2', $this->data));
        return $higher << 32 | $lower;
    }
public function readVarint ( ) { list ( $ higher , $ lower ) = array_values ( unpack ( 'N2' , $ this -> data ) ) ; return $ higher << 32 | $ lower ; }
Read variable length integer.

@return string
Read variable length integer .