original_string: public function identify($isbn)
      {
          if($this->is10($isbn) === true) {
              return 10;
          }
          
          return ($this->is13($isbn) === true ? 13 : false);
      }
code: public function identify($isbn)
      {
          if($this->is10($isbn) === true) {
              return 10;
          }
          
          return ($this->is13($isbn) === true ? 13 : false);
      }
code_tokens: public function identify ( $ isbn ) { if ( $ this -> is10 ( $ isbn ) === true ) { return 10 ; } return ( $ this -> is13 ( $ isbn ) === true ? 13 : false ) ; }
docstring: Identifies the ISBN format and returns the corresponding
  number or false if no pattern matches.
  
  @param string
  @return int|false
docstring_tokens: Identifies the ISBN format and returns the corresponding number or false if no pattern matches .