Shopping system SESSION shared solution_PHP tutorial

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Please give me a solution shared by SESSION
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I found a shopping cart source code from the Internet. Its SESSION is automatically obtained and used in my existing website program. There is a problem that the website program SESSION and the shopping cart SESSION are independent.
How can we realize that the SESSION of the shopping cart is the SESSION of the existing website program?
Note: The SESSION of the website program is controlled by the user table of the database. The users can be divided into multiple levels. Different levels have different permissions. It is hoped that after the SESSION of the website program is integrated with the shopping cart SESSION, the shopping cart can be allocated through SESSION at the same time. User permissions.

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