foreach可以对 对象像数组意义遍历
foreach遍历对象遍历的是对象内部的所有公有属性

<?php
    class Man{
        public $name='LiLei';
        public $height=178;
        public $weight=140;
        protected $age=30;
        private $money=1000;
    }
    $m=new Man();
    foreach ($m as $K => $V){
        echo $K.':'.$V.'<br/>';
    }
?>