PHP Delegate Sample
Blog post https://codechord.com/2019/03/php-delegate/
Demo run
$ php App/Delegate/Sample.php
$ php App/Delegate/Sample2.php
$ php App/Delegate/Sample3.php
or
$main = new Sample();
$main->run();
$main2 = new Sample2();
$main2->run();
$main3 = new Sample3();
$main3->run();