php中if ($goods)和if isset($goods)的区别if ($goods) 的全写是什么?

php中if ($goods)和if isset($goods)的区别if ($goods) 的全写是什么? PHP中 $row['goods_name'] 和 $goods.formated_goods_price 中的 “[ ]”“ . php中if $_POST) { } else if (($_POST) && ($_POST[action] == sub)) { PHP中if(isset($_POST[txtUn]) &&!empty($_POST[txtUn]))的意思?txtUn是什么? if only there was another way I could get my hands on these goods 翻译 if I were和if I am的区别 If I can和If I could都可以吧? IF I if(i if(!(i If I PHP if函数里直接写一个变量是什么意思 $this->data['comment']=''; if (isset($this->session->data['comment'])) PHP中这2行代码是什么意思? lingo中if语句@if(@abs（z(i)-k(j)) I would appreciate it to be frank ,if goods could be delivered as soon as possible汉语意思 we are tracking on it.if goods is released.i will deliver it soon 这里语法有误吗 关于if i want和if i wanted区别i would have to take unpaid leave if i want to study full-time.you could do that in eighteen months if you wanted.在这两句话中,为什么一个用了if i want而另一个却用了if i wanted,是不是i C语言中”if(!(x%i))”是什么意思?