php5 学习记要(2)

class Users {
    
    private $arr = array();

    function __get($name) {
        return $this->arr[$name] === NULL ? 'null' : $this->arr[$name];
    }

    function __set($name, $value) {
        $this->arr[$name] = $value;
    }

}

$user = new Users();
$user->a = 'xiezheng';
print $user->a;

class HelloWorld {
    function display($count) {
        for($i=0; $i<$count; $i++)
            print __CLASS__.'<br />';
        return $count;
    }
}

class HelloWorldCall {
    private $obj;
    function __construct() {
        $this->obj = new HelloWorld();
    }

    function __call($method, $args) {
        return call_user_func_array(array($this->obj, $method), $args);
    }
}

$hwc = new HelloWorldCall();
print $hwc->display(3);

class Users implements ArrayAccess {
    
    private $uname;

    function offsetExists($name) {
        return $this->uname === NULL;
    }

    function offsetGet($name) {
        return $this->offsetExists($this->uname) ? 'NULL' : $this->uname;
    }

    function offsetSet($name, $value) {
        $this->uname = $value;
    }

    function offsetUnset($name) {
        $this->uname = null;
    }

}

$user = new Users();
$user['name'] = 'xiezheng';
// unset($user['name']);
print $user['name'];