<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
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