UsersController_with_Interface.php

<?php

interface Logger 
{
    public function execute($message);
}

class LogToDatabase implements Logger 
{
    public function execute($message){
        var_dump('log the message to a database :'.$message);
    }
}

class LogToFile implements Logger 
{
    public function execute($message) 
    {
        var_dump('log the message to a file :'.$message);
    }
}

class UsersController 
{
    protected $logger;
    
    public function __construct(Logger $logger) 
    {
        $this->logger = $logger;
    }
    
    public function show() 
    {
        $user = 'nahid';
        $this->logger->execute($user);
    }
}

$controller = new UsersController(new LogToDatabase);
$controller->show();

Hello brother, I read your Article in medium.com, Please can you explain this for me.

**public function __construct(Logger $logger);
$controller = new UsersController(new LogToDatabase);**

Here Logger is Interface, but pass Instance of LogToDatabase class when creating instance of UserController class. How this is work?
I know that we cannot create instance of an interface. but there passing Instance of LogToDatabase class, a reciveing it using Logger Interface, How this is work?

Hello, Here I didn't create the instance of the interface. Please read about the dependency injection. I hope your concept will be cleared.

…

On Thu, Apr 23, 2020 at 9:33 PM Mobarok Hossain Rubel < ***@***.***> wrote: ***@***.**** commented on this gist. ------------------------------ Hello brother, I read your Article in medium.com, Please can you explain this for me. **public function __construct(Logger $logger); $controller = new UsersController(new LogToDatabase);** Here Logger is Interface, but pass Instance of LogToDatabase class when creating instance of UserController class. How this is work? I know that we cannot create instance of an interface. but there passing Instance of LogToDatabase class, a reciveing it using Logger Interface, How this is work? — You are receiving this because you authored the thread. Reply to this email directly, view it on GitHub <https://gist.github.com/034f5f6187b9886539eddfdf384de5a5#gistcomment-3266597>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAXESAFIRAAIVYQCEQDRMOLROBNU5ANCNFSM4MPE5SFA> .

-- Regards, Nahidul Hasan Senior Software Engineer Brain Station 23 Ltd. Dhaka,Bangladesh.