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To give a simple example, when you use a class you have never touched or want to learn more about a class, you can go to the API documentation to find the corresponding class, and you can clearly see the attributes of this class. methods and documentation.

You can find out if you write more projects. Let’s give a simple example

Do you know how to judge: whether the request is a post, an ajax request or getting the user's IP?

https://laravel.com/api/5.2/Illuminate/Http/Request.html

The document will get you started, but it cannot explain all the system function methods clearly. At this time, you need to consult the API manual to see what system methods can be used. Of course, it is also possible to check the source code, but if Just want to quickly check the available methods, or the API manual is faster