aliyun-php-sdk-vod aliyun-php-sdk-vod composer pack use vod\Request\V20170321\xxx; docs: 1.https://help.aliyun.com/document_detail/55407.html?spm=5176.doc52576.6.623.0vIj3S 2.https://help.aliyun.com/document_detail/52576.html?spm=5176.doc55407.6.671.ngG8MQ