日志如何按年月日创建目录？

'operating' => [
        'handlers' => [
            [
                'class' => Monolog\Handler\RotatingFileHandler::class,
                'constructor' => [
                    runtime_path() . '/logs/crontab/'.date('Y').'/'.date('md').'/operating.log',
                    7, //$maxFiles
                    Monolog\Logger::DEBUG,
                ],
                'formatter' => [
                    'class' => Monolog\Formatter\LineFormatter::class,
                    'constructor' => [null, 'Y-m-d H:i:s', true],
                ],
            ]
        ],
    ]