Question

我需要这方面的帮助：

我理解代码，但我不理解最后一行的输出

为什么输出为b,A,B而不是A,b,B？

class magic{

    public $a = "A";    
    protected $b = array("a" => "A", "b" => "B","c" => "C");
    protected $c = array(1,2,3);


    public function __get($name){
        echo "$name,";
        return $this -> b[$name];
    }

}

$m = new magic();

echo $m->a;
// A
// because $a is public

echo $m->b;
// b,B
// because $b is protected

echo $m->a.",".$m->b; 
// b,A,B

Answer 1

问题是您在__get()方法中回显名称，这将立即输出值，但返回变量的值以便稍后显示。

如果您将例程更改为...

public function __get($name){
    //echo "$name,";
    return "$name,".$this -> b[$name];
}

您的输出变为 - A,b,B

魔术__get在php中

1 个答案: