重载和类的自动加载_PHP教程

＜?php    class Overloader    {        private $properties = array();        function __get($property_name)        {            if(isset($this->properties[$property_name]))            {                return($this->properties[$property_name]);            }            else            {                return(NULL);            }        }        function __set($property_name, $value)        {            $this->properties[$property_name] = $value;        }        function __call($function_name, $args)        {            print("Invoking $function_name()
n");            print("Arguments: ");            print_r($args);            return(TRUE);        }    }    $o = new Overloader();    //invoke __set() 给一个不存在的属性变量赋值,激活__set()    $o->dynaProp = "Dynamic Content";    //invoke __get() 激活__get()    print($o->dynaProp . "
n");    //invoke __call() 激活__call()    $o->dynaMethod("Leon", "Zeev"); ?＞

＜?php    //define autoload function    function __autoload($class)    {        include("class_" . ucfirst($class) . ".php");    }    //use a class that must be autoloaded    $u = new User;    $u->name = "Leon";    $u->printName(); ?＞