code example of a subclass method called by the PHP parent class _php Instance

Today, we suddenly find that we need to call the subclass in the parent class, which has not been used before, and can be found through practice. Examples such as:

Copy the Code code as follows:
/**
* Parent class calls subclass method base class
* @author LNMP100
*
*/
Class Baseapp
{
/**
* Call Subclass Method
* @version creation Time: 2013-07-10
*/
function _run_action ()
{
$action = "index";
$this $action ();
}
}

Class Defaultapp extends Baseapp
{

/**
* This method will be called in the parent class
*/
Function index ()
{
echo "Defaultapp->index () invoked";
}

function Go () {
Calling the parent class
Parent::_run_action ();
}
}

$default =new Defaultapp ();
$default->go ();
The Defaultapp->index () invoked is displayed

?>

But it doesn't feel like a parent tone class, it's a subclass of the way to tune itself, because instantiation is a subclass, and if you instantiate the parent class, you have a problem with the way you can tone the class.

