PHP abstract class constructor not working

Question

I wish to access some of my variables in a way like this:

System->Config->URL

Which in this case 'System' is my core class, 'Config' is an array and 'URL' is an item inside the array. Here is my 'system.php' code:

<?php

abstract class System {

    public $Config;

    public function __construct() {

        $this->Config = (object) array('URL' => 'localhost');
    }
}

echo System->Config->URL;

?>

When I run the above code I just see this:

Parse error: syntax error, unexpected '->' (T_OBJECT_OPERATOR), expecting ',' or ';'

Which is pointing out my echo line.

Now if I eliminate the abstract idea, and use this one, that works very well!

<?php

class System {

    public $Config;

    public function __construct() {

        $this->Config = (object) array('URL' => 'localhost');
    }
}

$System = new System();
echo $System->Config->URL;

?>

I've also tried to mix up the static and abstract keywords, but that didn't worked also. I even gave up with the __construct function and made a very normal method named 'Ready', but still couldn't call that when the class is defined abstract.

Does anyone knows what's wrong here? I have seen the similar codes works very well.

Any help or idea would highly appreciated!

Yeah, thanks! I thought that it doesn't need to initialize! :D — Mahdi
– Mahdi, Commented Sep 9, 2012 at 18:45

Bgi · Accepted Answer · 2012-09-09 18:34:53Z

4

Look at the definition of an "abstract" class. It's a class that cannot be instantiated. Only the classes that inherit it can be instantiated.

answered Sep 9, 2012 at 18:34

Bgi

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2 Comments

Bgi Over a year ago

You must be thinking of a static class ;)

Mahdi Over a year ago

I just look at an example of someone else to see how he did that, and then I lose the point, I guess. I had a bug on the other part, then, everything came together and that's happened! :D ... Thanks again!

Nanne · Accepted Answer · 2012-09-09 18:35:34Z

2

I'm not sure what you are trying to do. The second example works because it is right. An abstract class is a class you need to extend, and then you can instantiate that (child) class just as in your working example.

You might need to read up on what "abstract" does.

answered Sep 9, 2012 at 18:35

Nanne

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