thinkphp Development Framework function Detailed: R method

The R method is used to invoke the operation method of a controller, and is further enhanced and supplemented by a method.
Call format for the R method:
R (' [item://][Grouping/] Module/operation ', ' parameter ', ' Controller layer name ')
For example, we define an action method that is:

Then you can call this action method in other controllers by using the R method (the general R method is used to call across modules)

Represents the detail method that invokes the user controller (the detail method must be a public type), and the return value is a user data with Query ID 5. If you want to invoke an action method that has no arguments, the second argument can be left blank and used directly:

You can also support cross grouping and project calls, such as:

Represents the detail method that invokes the user controller under the Admin group.

Represents the detail method that invokes the user controller under the Admin project.
The official advice is not to make too many calls on the same floor, which can cause logical confusion, the part of the public call should be encapsulated into a separate interface that can be used to add a single controller layer to the interface call by using 3.1 of the new feature multilayer controllers, for example, we add an API controller layer,

Then, use the R method to call the

In other words, the third parameter of the R method supports the controller layer that specifies the call.
Also, the R method invokes the action method to support the operation suffix setting C (' Action_suffix '), and if you set the action method suffix, you still do not need to change the way the R method is invoked.