Update a table in Mysql using a form - php

Question

I'm building a simple bug tracker tool.
When you've created a project, you can select a project status (open, in progress, finished).
You can change this status on the project page with this select form, :
<form action="classes/changestatus.class.php" method="post">
<label> Change Project Status </label>
<select name="status" id="status">
<option value="open">Open</option>
<option value="inprogress">In Progress</option>
<option value="finished">Finished</option>
</select>
<input class="small button" value="Change Status" type="submit">
</form>
The form posts the action to this class:
$status = $_POST['status'];
$sql = "UPDATE INTO projects ( status ) VALUES ('$status')";
$result = mysql_query( $sql );
$result = mysql_real_escape_string( $sql );
$latestID = mysql_insert_id();
if ( $result ) {
header('Location: ../projectpage.php?id='.$latestID);
} else {
echo "There is something wrong. Try again later.";
}
mysql_close();
So, when you submit the form it will run the query above and go back to the project page, with the changed project status, but this doesn't work.
I always get redirected to the wrong project page and the data doesn't update in the mysql table.
The problem is that I can't get the id, when I have this link for example 'projectpage?id=20', it always redirects me to 'projectpage?id=0'.
Can anyone help me ? I know the code isn't fully sql injection proof and I don't use mysqli, I just like to have an anwser on my question.
Thanks!

Answer 1

You're not keeping the $id so the this data isn't being transferred. on your form use:
<input type='hidden' name='hdnID' value="<?php echo $id;?>">
<input class="small button" value="Change Status" type="submit">
Then on your form use:
$status = $_POST['status'];
$id = $_POST['hdnID'];

Answer 2

Try This,
$sql="UPDATE projects SET status = '$status', id = LAST_INSERT_ID(id)";
$latestID = mysql_insert_id();
It will works for you.

Answer 3

Use
$sql="UPDATE projects SET status = '$status'";
And mysql_insert_id will only work when an INSERT query is executed.You need an id to update it or either to redirect it...If you are giving id then you can do like
$sql="UPDATE projects SET status = '$status' WHERE id = $id";
And redirection will be like
header('Location: ../projectpage.php?id='.$id);