How can two websites in different domains maintain SESSION synchronization?

For example: {code...}, for example:

Domain Name 1: baidu.com/mobile domain name 2: test.baidu.com/mobile question: which solutions can be used to synchronize SESSION calls between two domains? The more detailed the better? Thank you.

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For example:

Domain Name 1: baidu.com/mobile domain name 2: test.baidu.com/mobile question: which solutions can be used to synchronize SESSION calls between two domains? The more detailed the better? Thank you.

Use the sameSessionStorage Methods and storage domains, suchFile SessionStored in the same directory,Database SessionIt is stored in the same database and data table. This will enable two websitesSessionConnect.

Session can be stored on the server in three ways: file format, default format, memory format, and database format. Then, we can solve this problem as long as the session can be saved on both servers. You can store the session in redis.