private function splitConfigurationKey($configurationIdentifier)
    {
        $configurationIdentifier = explode('.', $configurationIdentifier, 2);

        if (count($configurationIdentifier) === 1) {
            array_unshift($configurationIdentifier, '');
        }

        return $configurationIdentifier;
    }
private function splitConfigurationKey($configurationIdentifier)
    {
        $configurationIdentifier = explode('.', $configurationIdentifier, 2);

        if (count($configurationIdentifier) === 1) {
            array_unshift($configurationIdentifier, '');
        }

        return $configurationIdentifier;
    }
private function splitConfigurationKey ( $ configurationIdentifier ) { $ configurationIdentifier = explode ( '.' , $ configurationIdentifier , 2 ) ; if ( count ( $ configurationIdentifier ) === 1 ) { array_unshift ( $ configurationIdentifier , '' ) ; } return $ configurationIdentifier ; }
Split the configuration identifier and return each part.

@param string $configurationIdentifier Configuration identifier

@return string[] Identifier splitted
Split the configuration identifier and return each part .