<?php 加载类//include("./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);?>