asked on

know to go back to DocumentObject::getGroup

<?php
abstract class DomainObject {
    private $group;
    public function __construct() {
        $this->group = static::getGroup();
    }

    public static function create() {
        return new static();        
    }

    static function getGroup() {
        return "from default"; 
    }
}

class User extends DomainObject {
}

class Document extends DomainObject {
    static function getGroup() {
        return "from document"; 
    }
}

class SpreadSheet extends Document {
}
echo'<pre>';
$userCreate=User::create();
print_r($userCreate);
$spreadSheetCreate=SpreadSheet::create();
print_r($spreadSheetCreate);
echo'</pre>';
?>

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how does
$spreadSheetCreate=SpreadSheet::create();
know to go back to
DocumentObject::getGroup

ASKER CERTIFIED SOLUTION

Dan Craciun

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Ray Paseur

For better or worse, computer programming is a "precise science" requiring that we use the right names for variables and functions.

rgb192

ASKER

sorry I meant
DomainObject::getGroup
not
DocumentObject::getGroup

go to different getGroup
$userCreate=User::create();
$spreadSheetCreate=SpreadSheet::create();

Through inheritance. The Spreadsheet class inherits Document's methods.
This includes the getGroup() method (which is overriden in the Document class).

Is this example of late static binding?

SOLUTION