<"./Ren.class.php");
//include "./Ren.class.php";
include_once("./Ren.class.php");
include_once("./Ren.class.php");
$f = new Ren();
$f->test();

require("./Ren.class.php");
require_once("./Ren.class.php");
require_once "./Ren.class.php";
$f = new Ren();
$f->test(); 

自动加载类
//1.所有类文件名和类名要保持一致
//2.所有类文件放在同一文件下
//3.所有类文件命名规则一致
function __autoload($cname){
 require_once("./$cname.class.php"); 
}
$t = new test();
$t->ceshi().'<br>';
$s = new Ren();
$s->test();


两种魔术方法
 class Ren{
 public $name;
 public function say(){
  echo "输出对象方法"; 
 }
 //输出对象的方法
 public function __tostring(){
  echo "另一种输出方法"; //echo $s->__tostring();
  return "另一种输出方法";//echo $s;
 }
 //克隆对象的方法
 public function __clone(){
  $this->name = "Riven";//$this代表复本（克隆的对象）
 }
} 
$s = new Ren();
//echo $s->__tostring();//输出字符串
//$s->say();

$s->name = "小V";
var_dump($s);

$s1 = clone $s;
var_dump($s1);
?>