PHP OOPS扩展了类a，b，c，a1问题

Question

I have the below listed classes

1. Software_Base 2. User Login 3. Basic Function 4. User Logout

what i wanted to do is i need to access a child class method in another child class. but which is not inter connected with extends

My class extends looks like below

1. Software Base
   1. User Login
      1. User Logout
2. Basic function

`

  class base_class {

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

    public function init_class(){
        $this->user_login = new user_login;
        $this->base_functions = new base_functions; 
    }

    public function value_from_Base_class(){
        return 'Value From Base Class';
    }

}

class user_login extends base_class {
    public function __construct(){
        var_dump($this->value_from_Base_class());  # Works :) 
    }

    public function value_from_user_login_class(){
        return 'Value From User Login Class';
    }
}


class user_logout extends user_login {
    public function __construct(){
        var_dump($this->value_from_Base_class());  # Works :) 
        var_dump($this->value_from_user_login_class());  # Works :) 
    }

}


class base_functions extends base_class{ 
    public function __construct(){
        var_dump($this->value_from_Base_class());  # Not Works :(
        var_dump($this->value_from_user_login_class());  # Not Works :(
    }
}

`

Answer 1

Inject an user_login instance when contructing base_functions:

class base_functions extends base_class{
    public function __construct($user_login){
        var_dump($this->value_from_Base_class());
        var_dump($user_login->value_from_user_login_class());
    }
}
$f = new base_functions(new user_login());

The call to $this->value_from_Base_class() in base_functions should work anyway.