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PHP: “Notice: Undefined variable” and “Notice: Undefined index”
我知道它的基本知识，但我已经花了 8 个小时编码，这让我陷入困境。在第 14 行为我的更新查询接收到我所有帖子的未定义索引。如果您对此有任何帮助，我将不胜感激。
<html>
<head>
</head>
<body>
<h1><center><i>Edit/Add Course ID</i></center></h1>
<?php
$con = mysql_connect("localhost","u/n","p/w");
if (!$con){
die ("Can not connect: " . mysql_error());
}
mysql_select_db("my_db",$con);
if(isset($_POST['submit'])){
$UpdateQuery = "UPDATE course SET cours_num='$_POST[coursnum]',
cours_title='$_POST[courstitle]', cours_desc='$_POST[coursdesc]' WHERE
cours_num='$_POST[hidden]'";
mysql_query($UpdateQuery, $con);
};
$sql = "Select * FROM course";
$myData = mysql_query($sql,$con);
while($record = mysql_fetch_array($myData)){
echo "<form action=mydata.php method=post>";
echo "<b>Course Number:</b></br>";
echo "<input type=text maxlength=10 size=10 readonly name=coursnum value=" .
$record['cours_num'].">";
echo "</br></br>";
echo "<b>Course Title:</b><br/>";
echo "<input type=text maxlength=10 size=10 name=courstitle value=" .
$record['cours_title'].">";
echo "</br></br>";
echo "<b>Course Description:</b></br>";
echo "<input type=text name=coursdesc max length=50 size=50 value=" .
$record['cours_desc'].">";
echo "</br></br>";
echo "<input type=hidden name=hidden value=" . $record['cours_num'].">";
echo "<center><input type=submit name=submit value=Edit></center>";
echo "</form>";
}
mysql_close($con);
?>
</body>
</html>