如何和为什么使用花括号：return $ this-> {$ this-> action}（）; [英] How and why use curly braces: return $this->{$this->action}();

问题描述

所以在第一部分我做了2个对象，实例化两个类（一个我们从createController函数生成）

so in first part i made 2 object, instantiate two classes (one we generate from createController function)

$loader = new Loader(); 
$controller = $loader->createController(); 
$controller->executeAction();

和方法 executeAction p>

and the method executeAction code:

public function executeAction() {
    return $this->{$this->action}();
}

我的问题是这行代码： $ this-> {$ this-> action}（）如何调用此方法以及为什么使用花括号;试图执行扩展类的 action（）; 函数可能？

my question is taking this line of code: $this->{$this->action}() how this method is called and why use curly braces; Is trying to execute the action(); function of extended class maybe?

推荐答案

$this->{$this->action}();

表示应该调用的方法来自属性 $ this- > action 。

means that the method that should be called comes from the property $this->action.

$this->action = 'func1';
$this->{$this->action}();

等效于：

$this->func1();

请参阅变量变量和变量函数，以了解更多示例。需要大括号，因为 $ this-> $ this-> action（）通常被视为（$ this-> $ this ） - > action（）。

See the PHP documentation of variable variables and variable functions for more examples of this. The braces are needed because $this->$this->action() would normally be treated as ($this->$this)->action().

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