original_string: public function getPrefix()
      {
          if ($this->prefix == null) {
              $this->prefix = substr($this->msisdn, 0, 3);
          }
  
          return $this->prefix;
      }
code: public function getPrefix()
      {
          if ($this->prefix == null) {
              $this->prefix = substr($this->msisdn, 0, 3);
          }
  
          return $this->prefix;
      }
code_tokens: public function getPrefix ( ) { if ( $ this -> prefix == null ) { $ this -> prefix = substr ( $ this -> msisdn , 0 , 3 ) ; } return $ this -> prefix ; }
docstring: Returns the prefix of the MSISDN number.
  
  @return string The prefix of the MSISDN number
docstring_tokens: Returns the prefix of the MSISDN number .