php突然无法删除表里的数据，求助！！

<html>

<body>

<?php

require_once('connect.php');

$serial= $_POST['serial'];

$type=$_POST['type'];

$name=$_POST['name'];

$contact=$_POST['contact'];

$time=$_POST["time"];

echo $serial;

echo $type;

echo $name;

echo $contact;

echo $time;

$modifymysql="update work1 set job=$job where serial=$serial";

mysql_query($modifymysql);

</body>

</html>

输出是正常的，但是当修改时就出现错误

Notice: Undefined variable: job in D:\wampserver\wamp\www\modify_check.php on line 15

邓大大

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