original_string: public function headerExists($name)
      {
          $name = strtolower($name);
          if(isset($this->_headers[$name])) {
              return true;
          } else {
              return false;
          }
      }
code: public function headerExists($name)
      {
          $name = strtolower($name);
          if(isset($this->_headers[$name])) {
              return true;
          } else {
              return false;
          }
      }
code_tokens: public function headerExists ( $ name ) { $ name = strtolower ( $ name ) ; if ( isset ( $ this -> _headers [ $ name ] ) ) { return true ; } else { return false ; } }
docstring: Check wheater the Mail part has a specific header.
  
  @param  string $name
  @return boolean
docstring_tokens: Check wheater the Mail part has a specific header .