original_string: public function clearKey($keyname = self::DEFAULT_KEY)
      {
          if (isset($_COOKIE[$this->_params['session_name']]) &&
              isset($_COOKIE[$keyname . '_key'])) {
              $this->_setCookie($keyname, false);
              return true;
          }
  
          return false;
      }
code: public function clearKey($keyname = self::DEFAULT_KEY)
      {
          if (isset($_COOKIE[$this->_params['session_name']]) &&
              isset($_COOKIE[$keyname . '_key'])) {
              $this->_setCookie($keyname, false);
              return true;
          }
  
          return false;
      }
code_tokens: public function clearKey ( $ keyname = self :: DEFAULT_KEY ) { if ( isset ( $ _COOKIE [ $ this -> _params [ 'session_name' ] ] ) && isset ( $ _COOKIE [ $ keyname . '_key' ] ) ) { $ this -> _setCookie ( $ keyname , false ) ; return true ; } return false ; }
docstring: Clears a secret key entry from the current cookie.
  
  @param string $keyname  The name of the key to clear.
  
  @return boolean  True if key existed, false if not.
docstring_tokens: Clears a secret key entry from the current cookie .