First introduction to ThinkPHP controller, first introduction to thinkphp

This article focuses on the definition and basic operation content of ThinkPHP controller. I hope everyone can have a preliminary understanding of ThinkPHP controller. .

The most basic controller:

<&#63;php
namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {
  public function index(){

  }
  public function hello(){
    echo 'hello';
  }
}

The name of the controller is named in camel case (the first letter is capitalized), and the controller file is located at Application/Home/Controller/IndexController.class.php

The hello method of the IndexController controller class is the operation method. Visit the following URL address:

http://serverName/Home/Index/hello
will output "hello"

Pre and post operations:

<&#63;php
namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {

  public function _before_index(){
    echo "index.before<br>";
  }

  public function index(){
    echo "index<br>";
  }

  public function _after_index(){
    echo "index.after<br>";
  }
}

Configure ACTION_SUFFIX to change the way the operation method is written:

Because the operation method is a method of the controller, it may not be defined if it conflicts with the system's keywords. In this case, we can set the suffix of the operation method to solve the problem, such as

'ACTION_SUFFIX' => 'Action', // Operation method suffix
Set the suffix of the operation method to Action, so the controller’s operation method definition is adjusted to:

<&#63;php
namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {
  public function listAction(){
    echo 'list';
  }

  public function helloAction(){
    echo 'hello';
  }

  public function testAction(){
    echo 'test';
  }
}

Empty controller and empty operation method:

Empty operation means that when the system cannot find the requested operation method, it will locate the empty operation (_empty) method for execution. Using this mechanism, we can optimize error pages and some URLs.

As shown in the picture above, when visiting:

http://serverName/index.php/Home/City/beijing/
Since the City controller does not define the beijing, shanghai or shenzhen operation methods, the system will locate the empty operation method _empty for analysis. The parameter of the _empty method is the operation name in the current URL, so the results output in sequence are :

How did you find me?

Operations are bound to classes: (Function: You can define a class for each operation method instead of a method of the controller class)

Take the URL access as http://serverName/Home/Index/index as an example,

The original controller file definition location is: Application/Home/Controller/IndexController.class.php

The controller class is defined as follows:

namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller{
  public function index(){
    echo '執(zhí)行Index控制器的index操作';
  }
}

As you can see, we are actually calling the index method of the HomeControllerIndexController class.

Set parameters through configuration file

'ACTION_BIND_CLASS' => True,
After setting, the controller file location is changed to: Application/Home/Controller/Index/index.class.php

The controller class is defined as follows:

namespace Home\Controller\Index;
use Think\Controller;
class index extends Controller{
  public function run(){
    echo '執(zhí)行Index控制器的index操作';
  }
}

Now, what we are calling is actually the run method of the HomeControllerIndexindex class.
The above is the entire content of this article. I hope it will be helpful to everyone in learning PHP programming.

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