PHP邮箱、QQ、手机，部分为*，不显示全部

if($user_info['email']!=""){        //$user_info['email'] = substr_replace($user_info['email'],'****',1,strrpos($user_info['email'],"@")-3);    }    if($user_info['mobile_phone']!=""){        //$user_info['mobile_phone'] = substr_replace($user_info['mobile_phone'],'****',strlen($user_info['mobile_phone'])-4,strlen($user_info['mobile_phone']));    }    if($user_info['qq']!=""){        //$user_info['qq'] = half_replace($user_info['qq']);    }