[php]<?php
class a
{
public $a = 'aa';

public function f()
{
echo $this->a;
}
}


class b extends a
{
protected $a = 'ba';
}

class c extends b
{
public $a = 'ca';
}

$d = new c;
$d->f();
?>[/php]

下面这个是可以的

[PHP]<?php
class a
{
protected $a = 'aa';

public function f()
{
echo $this->a;
}
}


class b extends a
{
protected $a = 'ba';
}

class c extends b
{
public $a = 'ca';
}

$d = new c;
$d->f();
?>[/PHP]


区别就a类里面属性A的修饰词,一个public，一个protected

[ 本帖最后由 xosharp 于 2006-4-24 10:53 PM 编辑 ]