public function getMissingParameterKey(array $parameters, array $requiredKeys = [])
    {
        foreach ($requiredKeys as $key) {
            if (! isset($parameters[$key])) {
                return $key;
            }
        }
    }
public function getMissingParameterKey(array $parameters, array $requiredKeys = [])
    {
        foreach ($requiredKeys as $key) {
            if (! isset($parameters[$key])) {
                return $key;
            }
        }
    }
public function getMissingParameterKey ( array $ parameters , array $ requiredKeys = [ ] ) { foreach ( $ requiredKeys as $ key ) { if ( ! isset ( $ parameters [ $ key ] ) ) { return $ key ; } } }
Get missing parameter's key.

@param array $parameters
@param array $requiredKeys

@return string|null
Get missing parameter s key .