提交表单后，偶使用下买面的语句
[php]
if(@$_POST["Submit"])
{ echo $_POST["id_writer"];//测试用的
$name_writer =$_POST["name_writer"];
$id_writer=$_POST["id_writer"];
}
[/php]

这时能够正确输出echo $_POST["id_writer"];
可是接下来系统提示：Notice: Undefined variable: id_write in d:\usr\www\html\yayu\bbs\addart.php on line 19

这使偶很不理解为什么 $name_writer =$_POST["name_writer"];没有出错，下面的$id_writer=$_POST["id_writer"];会出错呢？