Container dependency injection in laravel, generating class instances multiple times

look at laravel in Comtroller to find that during class dependency injection, when I created an object through make , I found that multiple instances of the dependency were created.

the code is as follows:

<?php

namespace Tests\Unit;

use Illuminate\Container\Container;
use Tests\TestCase;

interface SessionStorage
{
    public function get($key);

    public function set($key, $value);
}

class FileSessionStorage implements SessionStorage
{
    public function __construct()
    {
        echo "file init \n";
    }

    public function get($key)
    {
        // TODO: Implement get() method.
    }

    public function set($key, $value)
    {
        // TODO: Implement set() method.
    }
}

class MySqlSessionStorage implements SessionStorage
{
    public function __construct()
    {
        echo "mysql init \n";
    }

    public function get($key)
    {
        // TODO: Implement get() method.
    }

    public function set($key, $value)
    {
        // TODO: Implement set() method.

    }
}

class SimpleAuth
{
    protected $session;

    public function __construct(SessionStorage $session)
    {
        $this->session = $session;
    }

    public function get()
    {
        $this->session->get(null);
    }

}

class ExampleTest extends TestCase
{
    /**
     * A basic test example.
     *
     * @return void
     */
    public function testBasicTest()
    {
        $container = Container::getInstance();

        $container->bind( SessionStorage::class, MysqlSessionStorage::class );
        $container->make(SimpleAuth::class);
        echo "-\n";

        $container->bind( SessionStorage::class, FileSessionStorage::class );
        $container->make(SimpleAuth::class);
        echo "-\n";

        $container->bind( SessionStorage::class, MysqlSessionStorage::class );
        $container->make(SimpleAuth::class);
    }
}

The output of the

code is as follows:

different than expected:

the first make operation, you can see from the output of the constructor that the dependency is instantiated only once
but then call bind , make found that the constructor was called twice

mysql init 
-
file init 
file init 
-
mysql init 
mysql init

try debug : record the number of calls in the make function. :

public function make($abstract, array $parameters = [])
{
    if (stripos($abstract, "SessionStorage") !== false) {
        echo "make plus \n";
    }
    return $this->resolve($abstract, $parameters);
}

===================  =================
make plus 
make plus 
mysql init 
-
make plus 
make plus 
file init 
make plus 
make plus 
file init 
-
make plus 
make plus 
mysql init 
make plus 
make plus 
mysql init

how to break!

Php

Mar.01,2021