public function getConfig($key) {
        return isset($this->_config[$key]) ? $this->_config[$key] : null;
    }
public function getConfig($key) {
        return isset($this->_config[$key]) ? $this->_config[$key] : null;
    }
public function getConfig ( $ key ) { return isset ( $ this -> _config [ $ key ] ) ? $ this -> _config [ $ key ] : null ; }
Return a specific configuration key value.

@param string $key
@return mixed
Return a specific configuration key value .