PHP classes and inheritance

Class A {
    function A () {//constructor
        include ( 'db.php' );
        $this->db = new DB();//responsible for database operations
        $this->C = new C();//when instanciated, should echo those records
    }

    function get_records () {//returns a number
         return $this->db->RecordCount ( 'SELECT * FROM bla bla' );
    }
}

$class = new A();

Class C {
    global $class;
    function C () {//constructor
        echo $class->get_records ();
    }
}

PHP:

When I do this I het an error that $class is not an object (call to a member function on a non object). Any idea why?

 

that is a mess i dont think you understand inheritance etc. to be able to use methods from class A you need class C to extend Class A and why are you making an instance of the supposed child class C in the parent class A?

 

Class A {
    function A () {//constructor
        include ( 'db.php' );
        $this->db = new DB();//responsible for database operations
    }

    function get_records () {//returns a number
         return $this->db->RecordCount ( 'SELECT * FROM bla bla' );
    }
}

Class C extends A{
    global $class;
    function C () {//constructor
        echo $class->get_records ();
    }
}

$class = new C();

PHP:

this will work or at least it should