Online PHP editor | output for BrKjv

<?php namespace StockExample; interface Order { public function execute(); } class StockBuy { public function __invoke() { echo "You want to buy stocks via __invoke()" . PHP_EOL; } } class StockSell { public function __invoke() { echo "You want to sell stocks __invoke()" . PHP_EOL; } } class MyCommand implements Order { private $action; public function __construct(callable $action) { $this->action = $action; } public function execute() { // Option 1) use call_user_function call_user_func($this->action); // Option 2) define it as a variable and call it by adding `()` //$action = $this->action; //$action(); } } // example with a callable object $bsc = new MyCommand(new StockBuy()); $ssc = new MyCommand(new StockSell()); $bsc->execute(); $ssc->execute();