Question

I have the follow code, which I expect to return “WORKED”, But returning nothing.

class Foo {
    public function __construct() {
        echo('Foo::__construct()<br />');
    }

    public function start() {
        echo('Foo::start()<br />');

        $this->bar = new Bar();
        $this->anotherBar = new AnotherBar();
    }
}

class Bar extends Foo {
    public function test() {
        echo('Bar::test()<br />');

        return 'WORKED';
    }
}

class AnotherBar extends Foo {
    public function __construct() {
        echo('AnotherBar::__construct()<br />');

        echo($this->bar->test());
    }
}

$foo = new Foo();
$foo->start();

Router:

Foo::__construct() <- From $foo = new Foo();
Foo::start() <- From Foo::__construct();
Foo::__construct() <- From $this->bar = new Bar();
AnotherBar::__construct() <- From $this->anotherBar = new AnotherBar();

Because I define $bar from Foo class, and, extend AnotherBar to Foo, I expect to get variables already defined from Foo.

I can’t see what is wrong. Where cam I start?

Thanks!

Answer 1

The AnotherBar instance never had its start method called so its $this->bar is undefined.

With errors being displayed you get the following messages:

Notice: Undefined property: AnotherBar::$bar in - on line 20  
Fatal error: Call to a member function test() on a non-object in - on line 20

You can include the following code right after you <?php line to see all errors:

ini_set('display_errors', 'on');
error_reporting(E_ALL);

Of course you can also do this via php.ini which would be a cleaner solution.