I have a class with a factory-pattern function in it:
abstract class ParentObj {
public function __construct(){ ... }
public static function factory(){
//returns new instance
}
}
I need children to be able to call the factory function and return an instance of the calling class: $child = Child::factory();
and preferably without overriding the factory function in the child class.
I have tried multiple different ways of achieving this to no avail. I would prefer to stay away from solutions that use reflection, like __CLASS__
.
(I am using PHP 5.2.5 if it matters)
If you can upgrade to PHP 5.3 (released 30-Jun-2009), check out late static binding, which could provide a solution:
abstract class ParentObj {
public function __construct(){}
public static function factory(){
//use php5.3 late static binding features:
$class=get_called_class();
return new $class;
}
}
class ChildObj extends ParentObj{
function foo(){
echo "Hello world\n";
}
}
$child=ChildObj::factory();
$child->foo();
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