php封装的问题[code=PHP][/code]定义了一个User类class User{private $arr;//进行封装不让外部使用function __construct(){$this->arr = $this->get_data();//构造函数，在类一实例化的时候就会执行}public function isNotExist(){echo "Does not exist";echo "重新输入";}private function get_data(){$arr=array(array("name"=>"张三","age"=>12,"sex"=>"男"),array("name"=>"李四","age"=>25,"sex"=>"男"),array("name"=>"王五","age"=>18,"sex"=>"男"),array("name"=>"李利","age"=>16,"sex"=>"女"),array("name"=>"陈明","age"=>25,"sex"=>"男"),array("name"=>"张晓","age"=>25,"sex"=>"女"),array("name"=>"李明","age"=>15,"sex"=>"男"),array("name"=>"赵亮","age"=>25,"sex"=>"男"),array("name"=>"张月","age"=>22,"sex"=>"男"),array("name"=>"王青","age"=>21,"sex"=>"女"));return $arr;}public function joinHtml($array){if(count($array)==0){User::isNotExist();}$d = 0;$b ="";foreach($array as $t){$d = $d+1;$a = "".$d."".$t['name']."".$t['age']."".$t['sex']."";$b = $b.$a;}$b = $b . "";return $b;}//下面是继承User这个类，上面的不允许改变。
class newUser extends User{function get_both_sex_ages($sex, $age1,$age2){}我需要在上面那个方法中调用$arr，不知道该怎么办，求解------解决方案--------------------基类Private派生类无法访问，这是面向对象的通用规则，要么基类直接提供访问private属性的public/protected接口给派生类使用，要么将属性直接设置为protected以便派生类的接口直接访问。