如何从具有变量的类中调用方法? [英] How would I call a method from a class with a variable?

问题描述

提供此类:

class Tacobell{

    public function order_taco(){
        echo "3 Tacos, thank you.";
    }

    public function order_burrito(){
        echo "Cheesy bean and rice, please";
    }

}

$lunch = new Tacobell;
$lunch->order_burrito();
$lunch->order_taco();

我该怎么做?

$myOrder = 'burrito';
$lunch->order_.$myOrder;

显然，该代码是繁琐的工作-但显示出我想做的比尝试解释它要好.

Obviously that code is bunk--but shows what I'm attempting to do better than trying to explain it away.

也许我正在解决所有这些错误.我考虑过一个带有switch语句的方法，传入burrito或taco，然后从那里调用正确的方法.但是然后我必须从一开始就知道结束，我可能有很多方法，而我宁愿不必每次都更新switch语句.

And maybe I'm going about this all wrong. I thought about a method with a switch statement, pass in burrito or taco, then call the right method from there. But then I have to know the end from the beginning, and I may potentially have lots of methods and I'd rather not have to update the switch statement everytime.

谢谢！

推荐答案

这样的事情怎么样?

class Tacobell {
    public function order_burrito() {
         echo "Bladibla.\n";
    }

    public function order($item) {
        if (method_exists($this, "order_$item")) {
            $this->{'order_' . $item}();
        } else {
            echo "Go away, we don't serve $item here.\n";
        }
    }
}

您可以使用$ lunch-> order('burrito');来调用它，它对我来说看起来更干净.它把所有的丑陋都放在了Tacobell :: order方法中.

You would call it using $lunch->order('burrito');, which looks much cleaner to me. It puts all the uglyness in the method Tacobell::order.

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