Using HTML variable in PHP

Question

I'm trying to use the value stored in token in my PHP script to update a database value with SQLite. It wont let me use document.getElementByID....any ideas?

<div id="TokenCount">
<label for="token"><abbr title="Tokens">Tokens</abbr></label>
<input id="token" value="0" />
</div>

<div id="Buttons">
<button id="pay" onClick="pay(10); loadMessage()"><?php $db=sqlite_open("../../logins.db"); 
$token = document.getElementById('token').value;
sqlite_query($db,"UPDATE Users SET tokens='$token' WHERE user_id='{$_SESSION['user_id']}'"); 
sqlite_close($db); ?>Pay</button> 
</div>
</div>   

Answer 1

PHP code is executed server-side, so the website is sent to the client with the result of the PHP code without any PHP found in the source. Because of this HTML tags cannot be used in PHP on a website.

Answer 2

As i said in comments, you can't execute PHP-code(server side code) on client side (in browser).

You should send AJAX query to server, and save this value to mysql on server side.

Javascript(jquery) code:

function loadMessage(){
    $.post("setValue.php", {val:document.getElementById('token').value} function( data ) {
       alert('success');
    });
}

Create new php script for example setValue.php (r use contoller action, or your own staff how you routing pages). Script code:

$token = $_POST['val'];
sqlite_query($db,"UPDATE Users SET tokens='$token' WHERE user_id='{$_SESSION['user_id']}'"); 
sqlite_close($db);