คือไม่สามรถ add หรือ edit ได้ มั้นฟ้อง Parse error: syntax error, unexpected '$query' (T_VARIABLE) in C:\xampp\htdocs\php\student.php on line 40

	$sql="update tb_student set stu_name='$stu_name', address='$address', status='$status' where stu_id=".intval($_POST['txtid']);

<?php
include('db.php');

?>

<a href="student.php">Add new</a> <br/><br/>
<table cellpadding="5" cellspacing="0" border="1">
	<tr>
		<th>No</th>
		<th>StuName</th>
		<th>Addr</th>
		<th>Stat</th>
		<th>Acti</th>
	</tr>



<?php
$sql="select * from tb_student";
$query=mysql_query($sql);
if(mysql_num_rows($query)>0)
{
	$i=1;
	while ($row=mysql_fetch_object($query)) 
		{
		
	$status=($row->status==1)?'Active':'Suspend';

?>

	<tr>
		<td><?php echo $i++; ?></td>
		<td><?php echo $row->stu_name; ?></td>
		<td><?php echo $row->address; ?></td>
		<td><?php echo $row->status; ?></td>
		<td>
			<a href="student.php?edited=1&id=<?php echo $row->stu_id; ?>">Edit</a> |
			<a href="student.php?deleted=1&id=<?php echo $row->stu_id; ?>">Delete</a>
		</td>
	</tr>

	<?php
		}
	
}


	?>

</table>

<?php
include('db.php');
$error="";

$stu_id="0";
$stu_name="";
$address="";
$status="";


if(isset($_POST['btnsave']))
{

	$stu_name=$_POST['txtstu_name'];
	$address=$_POST['txtaddress'];
	$status=$_POST['slostatus'];


	if(strlen($stu_name)<4)
{
	$error="at least 4 charecter";

}else
{

	if($_POST['txtid']=="0")

	{
		//add new student
		$sql="insert into tb_student(stu_name,address,status) values('$stu_name','$address','$status')";
		$query=mysql_query($sql);
		if($query)
		{
			//render success
			header('Refresh:0, index.php');
		}
	}else{
		//update
		$sql="update tb_student set stu_name='$stu_name', address='$address', status='$status' where stu_id='{$_POST['txtid']}' ";
		$query=mysql_query($sql);
		if($query)
		{
			header('Refresh:0, index.php');
		}
	}
}

//where stu_id=".intval($_POST['txtid']);
}

//check id for id
if (isset($_GET['edited'])) {
	

	$sql="select * from tb_student where stu_id='{$_GET['id']}' ";
	$query=mysql_query($sql);
	$row=mysql_fetch_object($query);
	$stu_id=$row->stu_id;
	$stu_name=$row->stu_name;
	$address=$row->address;
	$status=$row->status;

}


//check delete
if(isset($_GET['deleted']))
{
	$sql="delete from tb_student where stu_id='{$_GET['id']}'";
	$query=mysql_query($sql);
	if($query)
	{
		header('Refresh:0, index.php');
	}
}





?>







<form action="" method="post">
	<table>
		<tr>
			<td colspan="2"><span style="color:red;"><?php echo $error;?></span></td>
		</tr>
		<tr>
			<td>Student Name</td>
			<td><input type="text" name="txtstu_name" value="<?php echo $stu_name; ?>"> <input type="hidden" name="txtid" value="<?php echo $stu_id; ?>" /> </td>
		</tr>

		<tr>
			<td>Address</td>
			<td><textarea name="txtaddress"><?php echo $address; ?></textarea></td>
		</tr>

		<tr>
			<td>Status</td>
			<td>
				<select name="slostatus">
					<option <?php if($status=='1') echo 'selected'; ?> value="1">Active</option>
					<option <?php if($status=='0') echo 'selected'; ?> value="0">Suspend</option>
				</select>
			</td>
		</tr>

		<tr>
			<td></td>
			<td><input type="submit" value="Save" name="btnsave"></td>
		</tr>
	</table>
</form>