php

php求助
include "mysql.inc.php";
session_start();
echo "";
echo "";
echo "";
echo "

航班信息："; echo $_SESSION["_flight"]." "; echo $_SESSION["_from"]."-"; echo $_SESSION["_to"]." "; echo $_SESSION["_date"]." "; echo $_SESSION["_takeoff"]."-"; echo $_SESSION["_arrive"]." "; echo $_SESSION["_company"]." "; echo $_SESSION["_cabin"]." "; echo $_SESSION["_price"]." "; echo "
"; echo "乘客姓名：".$_POST[name]."	"; echo "身份证号：".$_POST[idnum]."
"; echo "联系人姓名：".$_POST[contact]."	"; echo "联系电话：".$_POST[phone]."

";

?>

if($submit2){
$sql="insert into psgrinfo values ('','$_POST[name]','$_POST[idnum]')";
mysql_query($sql);
// header("Location:ordering.php");
}

?>

问题是写入数据库时，能够写入，第一字段为自动添加，但是后面两个字段都是空的，之前乘客姓名那$_POST[name]输出是没有问题的，求解决办法

------解决方案--------------------

引用