关于PHP的加载类操作及其他魔术方法的应用

<?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().&#39;<br>&#39;;
$s = new Ren();
$s->test();

 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);
?>