PHP learning to set the cookie usage level on the client

How to set the cookie usage level of the client browser? Let me take IE6 as an example.
There are 6 levels of cookie settings in IE6, including accepting all cookies, low, medium, upper medium, and high, and blocking all cookies. These six levels have corresponding explanations in IE settings, and users can set them according to their own needs. The steps are as follows:
1. Select the "Tools"->"Internet Options" menu command in IE.
2. The system pops up the "Internet Options" dialog box, select the "Privacy" tab.
3. You can set whether to allow cookies by adjusting the slider. For example, setting "Block all cookies" will completely restrict the use of cookies. At this time, the cookies will be invalid. PHP learners can try it out by themselves.

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