How to stop creating class objects?

Question

PHP

Hello, I decided to learn how to program at least a little in an adult way, and now .. I have a project in development, the following code is everywhere in the classes. I'm not comfortable that I have to create an object in __construct in order to use it in a class.

class TaskKey_Model
{
    private $database;
    private $user;
    private $task;

    public function __construct()
    {
        $this->database = new Database();
        $this->user = new User_Model();
        $this->task = new Task_Model();
        ..... и так далее
    }
}

Obviously, Database() can be taken out into a separate model, such as ActiveRecord, and simply inherited from it, but then what to do with User_Model and other things? How not to announce it all the time? (transfer everything to activerecord and call it statically, right?) and what other options are there

Answer 1

Obviously, Database() can be moved to a separate model, such as ActiveRecord,

You already have it, in the Database class.
But this is not worth doing. From the word at all.
There is such a thing, Dependency Injection (DI). Read. Maybe don't smoke it right away. But it is necessary to understand and learn to work with it.
It should be like - you have a container that knows all your classes / services (they register in it or are pulled up using the Service Locator). It (the container) also holds instances of these classes - the first time the class is called, it is initialized 1 time and stored in the container. On subsequent calls, the container returns an already existing instance. You don't need to initialize services in constructors, it hard-wires your code and leads nowhere. Dependencies must be thrown through the constructor, parameters.

Answer 2

You can use the Registry template.