添加失败，notice id未定义
//doaction.php
<?php
header('content-type:text/html;charset=utf-8');
$mysqli= new mysqli('localhost','root','127656','class');
if($mysqli->connect_errno){
die($mysqli->connect_error);
}
$mysqli->set_charset('utf8');
$username=$_POST['username'];
$username=$mysqli->escape_string($username);
$password=($_POST['password']);
$age=$_POST['age'];
$act=$_GET['act'];
$id=$_GET['id'];
switch($act){
case 'adduser':
$sql="INSERT user(username,password,age) VALUES('{$username}','{$password}','{$age}')";
$res=$mysqli->query($sql);
if($res){
$insert_id=$mysqli->insert_id;
echo "<script type='text/javascript'>
alert('添加成功，网站的第{$insert_id}位用户');
location.href='userlist.php';
</script>";
exit;
}
else{
echo "<script type='text/javascript'>
alert('添加失败，重新添加');
location.href='adduser.php';
</script>";
exit;
}
break;
case 'deluser':
//echo '删除记录'.$id;
$sql=" DELETE FROM user WHERE id=".$id;
$res=$mysqli->query($sql);
if($res){
$mes='删除成功';
}
else{
$mes ='删除失败';
}
$url='userlist.php';
echo "<script type='text/javascript'>
alert('{$mes}');
location.href='{$url}';
</script>";
exit;
break;
}
?>
//userlist.php
<?php
header('content-type:text/html;charset=utf-8');
$mysqli=new mysqli('localhost','root','127656','class');
if($mysqli->connect_errno){
die('CONNECT ERROR：'.$mysqli->connect_error);
}
$mysqli->set_charset('utf-8');
$sql="SELECT id,userName,age FROM user";
$mysqli_result=$mysqli->query($sql);
if($mysqli_result && $mysqli_result->num_rows>0){
while($row=$mysqli_result->fetch_assoc()){
$rows[]=$row;
}
}
print_r($rows);
?>
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<h2>用户列表-<a href="adduser.php">添加用户</a></h2>
<table border="1" cellpadding="0" cellspacing="0" width="80%" bgcolor="#abcdef">
<tr>
<td>编号</td>
<td>用户名</td>
<td>年龄</td>
<td>操作</td>
</tr>
<?php $i=1;foreach($rows as $row):?>
<tr>
<td><?php echo $i;?></td>
<td><?php echo $row['userName'];?></td>
<td><?PHP echo $row['age'];?></td>
<td><a href="edituser.php">更新</a>|<a href="doaction.php?act=deluser&id=<?php
echo $row['id'];?>">删除</a></td>
</tr>
<?php $i++; endforeach;?>
</table>
</body>
</html>
//adduser.php
<! DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<form action="doaction.php?act=adduser" method='post'>
<table border="1" cellpadding="0" cellspacing="0" width="80%" bgcolor="#abcdef">
<tr>
<td>用户名</td>
<td><input type="text" name="username" id="" placeholder="请输入合法用户名" required="required"/></td>
</tr>
<tr>
<td>密码</td>
<td><input type="password" name="password" id="" placeholder="请输入密码" required="required"/></td>
</tr>
<tr>
<td>年龄</td>
<td><input type="number" name="age" id="" min='1' max="125" placeholder="请输入年龄" required="required"/></td>
</tr>
<tr>
<td colspan="2"><input type="submit" value="添加用户"/></td>
</tr>
</table>
</body>
</html>
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