【说站】php中foreach的使用

class MyClass
{
    public $var1 = 'value 1';
    protected $protected = 'protected var';
    private   $private   = 'private var';
 
    function iterateVisible()
    {
       foreach($this as $key => $value) {  //类内, foreach定义在成员方法;
       print "$key => $value\n";
       }
    }
}
 
$class = new MyClass();
foreach($class as $key => $value) {    //作为类外函数读取对象
print "$key => $value\n";
}                                  //var1 => value 1, 仅输出public属性
$class->iterateVisible()       //var1 => value 1, protected => protected var, private => private var 输出所有对象属性;