foreach输出对象的所有属性

class myClass{
    public $a = "5";
    public $b = "7";
    public $c = "9";
   
    function __tostring(){
        return(var_export($this,TRUE));
    }
   
}

$x = new myclass();
foreach($x as $attribute){
    echo $attribute."<br />";
}

 

output:

5

7

9