Session tracking for PHP
Introduction
update time：2018-02-221. Reasons for session control
When switching between multiple pages, the user's logged-in status is maintained, and all the information accessed is the user's logged-in information.
Mechanism that can handle the sharing of data by the same user on multiple pages in the same website.
2. Application of cookies
Saving data to the client is relatively unsafe (personal preference information is less important information)
Transmitting data. If there is too much data, the speed drops.
1. Set cookies in the client
The setcookie() function sends an HTTP cookie to the client. If successful, the function returns true. Otherwise return false
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