How can inheritance and parent classes be utilized in PHP to streamline the use of shared objects like the entityManager in multiple classes?

To streamline the use of shared objects like the entityManager in multiple classes, inheritance and parent classes can be utilized in PHP. By creating a parent class that contains the shared object and its related methods, child classes can inherit from this parent class and access the shared object without duplicating code. This approach promotes code reusability and maintainability.

class ParentClass {
    protected $entityManager;

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

    // Add shared methods related to entityManager here
}

class ChildClass extends ParentClass {
    public function __construct($entityManager) {
        parent::__construct($entityManager);
    }

    // Add specific methods for ChildClass here
}

// Usage
$entityManager = new EntityManager();
$child = new ChildClass($entityManager);