original_string: public function getPrimaryKeyValue()
      {
          $primaryKey = $this->getPrimaryKey();
          if (isset($this->$primaryKey)) {
              return $this->$primaryKey;
          } else {
              return null;
          }
      }
code: public function getPrimaryKeyValue()
      {
          $primaryKey = $this->getPrimaryKey();
          if (isset($this->$primaryKey)) {
              return $this->$primaryKey;
          } else {
              return null;
          }
      }
code_tokens: public function getPrimaryKeyValue ( ) { $ primaryKey = $ this -> getPrimaryKey ( ) ; if ( isset ( $ this -> $ primaryKey ) ) { return $ this -> $ primaryKey ; } else { return null ; } }
docstring: Returns the value of the primary key
  
  @return null
docstring_tokens: Returns the value of the primary key