Geek Academy in-depth ThinkPHP framework video material sharing

As a scripting language widely used on the web server, PHP has unique advantages in agile web development, with many successful cases, active communities, rich resources, and many frameworks. ThinkPHP, as an earlier and relatively mature domestic PHP framework, has a considerable number of users in the country. Through the "Geek Academy In-depth ThinkPHP Framework Video Tutorial", we will introduce the basic knowledge of ThinkPHP to prepare for subsequent actual projects.

Video playback address: http://www.php.cn/course/322.html

The teacher’s teaching style :

Teachers’ lectures are simple and in-depth, clear in structure, analyzed layer by layer, interlocking, rigorous in argumentation, and rigorous in structure. They use the logical power of thinking to attract students’ attention and use reason to control the classroom teaching process. By listening to teachers' lectures, students not only learn knowledge, but also receive thinking training, and are also influenced and influenced by teachers' rigorous academic attitude.

The more difficult part in this video is the implementation of the shopping cart:

) The user does not log in with the username and password, adds the product, closes the browser and reopens it without logging in with the username and password. Question: Shopping cart product still there?

2) The user logs in with username and password, adds products, closes the browser and reopens it without logging in with username and password. Question: Are the products in the shopping cart still there?

3) The user logs in with username and password, adds products, closes the browser, then opens it again, logs in with username and password. Question: Are the items in the shopping cart still there?

4) The user logs in with username and password, adds products, closes the browser, opens the browser from his hometown, and logs in with username and password. Question: Are the items in the shopping cart still there?

The above four questions are all based on JD.com, so guess what the result is?
1) In
2) No more
3) In
4) In

If you can guess the answer, then you are really great, so about these four How is the point implemented? (If there are friends who don’t agree with it, you can try it with JD.com)
Let’s explain the principle of the shopping cart, and finally talk about the specific code implementation.
1) User If you add products without logging in, the products at this time are added to the browser's cookies, so when you visit again (without logging in), the products are still in the cookies, so the products in the shopping cart still exist.
2 ) The user logs in and adds products. At this time, both the products in the cookie and the products selected by the user will be added to the shopping cart, and then the products in the cookie will be deleted. So when the user visits again (without logging in), the shopping cart in the cookie will be The product has been deleted, so the product in the shopping cart is no longer there.
3) The user logs in and adds the product. At this time, the product is added to the database for persistent storage. Open the login username and password again. The user The selected product must still exist, so the products in the shopping cart still exist.
4)Reason 3)

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