php class extends

Question

I want to know is it possible to have a class that's extended have a var set and used from the base class?

eg:

class me
{
    public $hello = array();

    protected function setter($me)
    {
        $this->hello[] = $me;
    }
}

class foo extends me
{
    public function __construct()
    {
        $this->setter('foo');
    }
}

class yoo extends me
{
    public function __construct()
    {
        parent::setter('yoo');
    }
}

$me = new me();
$foo = new foo();
$yoo = new yoo();

print_r($me->hello);

the array printed is array() nothing is set.

It seems that what you are trying to do here is not set a var on the base class but set a var on an instance of the base class. The class me may be the base for the classes foo and yoo but the object $me is not the base of anything. — Okonomiyaki3000
– Okonomiyaki3000, Commented May 29, 2012 at 1:11

user142162 · Accepted Answer · 2012-05-29 00:59:06Z

1

Yes, you can do this by making $hello static:

public static $hello = array();

In doing so, you will have to drop the $this from $this->hello[] = $me; and replace it with a self, as hello will not longer be unique to the current object instance:

self::$hello[] = $me;

answered May 29, 2012 at 0:59

user142162

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2 Comments

Chris R Over a year ago

Cool and all I do is make a getter that does return self::$hello;

Okonomiyaki3000 Over a year ago

This is correct, but keep in mind that there will now be only one $hello for all instances of me and all of its subclasses.

zhujy_8833 · Accepted Answer · 2012-05-29 02:45:30Z

0

You were using

parent::setter('yoo');

But in parent class me, that function is not defined as static. So you cannot use :: to call un-static function.

answered May 29, 2012 at 2:45

zhujy_8833

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