code example of a subclass method invoked by the PHP parent _php instance

The discovery today of the need to call subclasses in the parent class has never been used before and is also possible through practice. Examples such as:

Copy Code code as follows:

<?php
/**
* Parent class calling subclass method base class
* @author LNMP100
*
*/
Class Baseapp
{
/**
* Call Subclass Method
* @version Date Created: 2013-07-10
*/
function _run_action ()
{
$action = "index";
$this-> $action ();
}
}

Class Defaultapp extends Baseapp
{

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

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

$default =new Defaultapp ();
$default->go ();
Defaultapp->index () will be displayed invoked

?>

But it feels like it's not a parent-class, it's a subclass of the way it is, because instantiation is a subclass, and if you instantiate the parent class, then you have a problem with the way the class is toned.