Laravel service container (inheritance and events)

The container is written in the front Context binding , Next, look at Inheritance and events

stay Laravel In the frame , Sometimes it needs to be modified Basic documents of the system , But modify vender A file in a directory , It must be an unwise choice , For the expansibility of the framework , You can modify or overwrite the value to be modified through the inheritance or event of the container .

For example, I want to set db Of setDefaultConnection The method can be like this

 $this->app->resolving('setDefaultConnection',function ($db,$app){
    
          $db->setDefaultConnection('ConnectionName');
 });

go back to A more practical example , Initialize a data in the controller

<?php


namespace App\Http\Controllers;


class Nut
{
    
    public $express;

    public $data;

    public function __construct(\App\Contracts\Express $express)
    {
    

        $this->express = $express;

    }

    public function get()
    {
    

        return $this->data;

    }
}

We added a new one to the original one data attribute , And the output .

At the service provider, you can This data It's initialized

Container events

$this->app->resolving('setDefaultConnection',function ($db,$app){
    
    $db->setDefaultConnection('ConnectionName');
});

Container inheritance

The way of inheritance and The event is a bit like , But you need to return the object

$this->app->extend('App\Http\Controllers\Nut', function ($service, $app) {
    
    $service->data = 'hello extend';
    return $service;
});

git add .
git commit -m  Container inheritance and events 
git push

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