How can PHP developers ensure that objects set in a registry are available for use throughout the application?

To ensure that objects set in a registry are available throughout the application, PHP developers can use a singleton pattern to create a centralized registry class. This class can store objects in an associative array and provide methods to set and retrieve objects from the registry. 

class Registry {
    private static $instance;
    private $registry = [];

    private function __construct() {}

    public static function getInstance() {
        if (self::$instance === null) {
            self::$instance = new self();
        }
        return self::$instance;
    }

    public function set($key, $value) {
        $this->registry[$key] = $value;
    }

    public function get($key) {
        return $this->registry[$key] ?? null;
    }
}

// Example usage
$registry = Registry::getInstance();
$registry->set('db', new Database());
$db = $registry->get('db');

Keywords

PHP object registry global scope singleton pattern dependency injection

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