wechat-php-sdk
WeChat public platform php development kit, weixin developer SDK
...After the developer creates an official account on the public platform website and obtains interface permissions, he can read the interface document to help development. In order to identify users, each user generates a secure OpenID for each official account. If you need to share multiple official accounts and mobile applications, you need to go to the WeChat open platform to bind these official accounts and applications to Under an open platform account, after binding, although a user has multiple different OpenIDs for multiple official accounts and applications, he has only one UnionID for all official accounts and applications under the same open platform account. ...