Are there any common pitfalls when working with DI containers and interfaces in PHP?

One common pitfall when working with DI containers and interfaces in PHP is not properly binding the interface to the concrete implementation in the container configuration. To solve this, make sure to explicitly bind the interface to the concrete class in the container setup to ensure that the correct implementation is injected when the interface is requested. 

// Define interface
interface DatabaseInterface {
    public function query($sql);
}

// Define concrete class implementing the interface
class MysqlDatabase implements DatabaseInterface {
    public function query($sql) {
        // Implementation
    }
}

// Setup DI container and bind interface to concrete class
$container = new DI\Container();
$container->set('DatabaseInterface', DI\create('MysqlDatabase'));

// Retrieve instance of DatabaseInterface from container
$database = $container->get('DatabaseInterface');

Keywords

DI containers interfaces PHP dependency injection errors

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