1.8 遍历对象

通过foreach遍历对象

<?php
class Student {
  public $name='tom';
  protected $sex='男';
  private $age=22;

  public function show() {
    foreach($this as $k=>$v) {
      echo "{$k}-{$v}<br>";
    }
  }
}
//测试
$stu=new Student;
foreach($stu as $k=>$v) {
  echo "{$k}-{$v}<br>";
}
echo '<hr>';
$stu->show();

结论：遍历到当前位置所能访问到属性