为什么小弟我不会写代码

为什么我不会写代码？

 添加考试

php代码：

if($_GET['do']=='add'){

    include DedeInclude('templets/student/student_voice_add.htm');

	$id = $_POST['username'];

	$email = $_POST['email'];

	$content = $_POST['content'];

	$time = date('Y-m-d H:i:s');

	$category = $_POST['category'];

	$flag = $_POST['flags'];

	$flags=implode(",",$flag);

	$checked = $_POST['checked'];

	//echo $id."
".$email."
".$content."
".$time."
".$category."
".$flags."
".$checked;

	$sql = "INSERT INTO djs_skstudent_voice (username ,content ,time ,category ,checked ,email ,flag)VALUES ('$id','$content', '$time' , '$category', '$checked','$email','$flags')";

	$dsql->ExecuteNoneQuery($sql);

倒是能够添加。但是他会添加一个所有值为空白的。然后才是自己想要添加的。就是说他会先执行一次所有值为空的sql。这是咋回事？

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------解决办法--------------------
执行之前，输出sql看看

$sql = "INSERT INTO djs_skstudent_voice (username ,content ,time ,category ,checked ,email ,flag)VALUES ('$id','$content', '$time' , '$category', '$checked','$email','$flags')";

die($sql);
------解决办法--------------------
点击链接是 get 方式
$_POST 数组不可能有值