How can Dependency Injection be implemented in PHP without relying on a large framework?

Dependency Injection is a design pattern that allows for decoupling of components by passing dependencies into a class rather than creating them within the class itself. In PHP, Dependency Injection can be implemented without relying on a large framework by manually injecting dependencies into the constructor or setter methods of a class. 

class Logger {
    private $storage;

    public function __construct(Storage $storage) {
        $this->storage = $storage;
    }

    public function log($message) {
        $this->storage->save($message);
    }
}

class Storage {
    public function save($data) {
        // Save data to storage
    }
}

$storage = new Storage();
$logger = new Logger($storage);
$logger->log("Hello, world!");

Keywords

Dependency Injection PHP implementation framework libraries

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