Online PHP editor | output for iIHn9

<?php namespace StockCommandNS; interface Order { public function execute(); } // Receiver class. class StockTrade { public function buy() { print("You want to buy stocks"); } public function sell() { print("You want to sell stocks "); } } // Invoker. class Agent { private \SplQueue $ordersQueue; public function __construct() { $this->ordersQueue = new \SplQueue(); } public function placeOrder(Order $order) { $this->ordersQueue->push($order); $order->execute($this->ordersQueue->shift()); } } //ConcreteCommand Class. class BuyStockOrder implements Order { private StockTrade $stock; public function __construct(StockTrade $st) { $this->stock = $st; } public function execute() { $this->stock->buy(); } } //ConcreteCommand Class. class SellStockOrder implements Order { private StockTrade $stock; public function __construct(StockTrade $st) { $this->stock = $st; } public function execute() { $this->stock->sell(); } } class MyCommand implements Order { private $action; public function __construct($action) { $this->action = $action; } public function execute() { $this->action->run(); } } $stock = new StockTrade(); $bsc = new BuyStockOrder($stock); $ssc = new SellStockOrder($stock); $agent = new Agent(); $agent->placeOrder($bsc); // Buy Shares $agent->placeOrder($ssc); // Sell Shares