Code example of PHP parent class calling subclass method_PHP tutorial

Today I suddenly discovered that I need to call the method of the subclass in the parent class. I have never used it in this way before. I found that it can also be done through practice. Example:

Copy code The code is as follows:

/**
* The parent class calls the 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(){
//Call the parent class
parent::_run_action();
}
}

$default=new DefaultApp();
$default->Go();
//DefaultApp->index() invoked

will be displayed

?>

But it feels like this is not called the parent class adjusting the subclass, but the subclass adjusting its own method. Because instantiation is a subclass, if you instantiate the parent class and can also adjust the subclass's method, there will be a problem.

http://www.bkjia.com/PHPjc/751514.htmlwww.bkjia.comtruehttp: //www.bkjia.com/PHPjc/751514.htmlTechArticleToday I suddenly discovered that I need to call the method of the subclass in the parent class. I have never used it in this way before. Through practice Discovery is okay too. Example: Copy the code. The code is as follows: ?php /** * Parent class call...