Is it possible to pass JavaScript data to PHP variables for further processing?

Yes, it is possible to pass JavaScript data to PHP variables for further processing by using AJAX. You can send the data from JavaScript to a PHP script using an AJAX request, and then process the data in the PHP script and store it in variables for further processing.

<?php
if(isset($_POST['data'])){
    $data_from_js = $_POST['data'];
    
    // Further processing of the data
}
?>
```

In your JavaScript code, you can make an AJAX request to send the data to the PHP script:

```javascript
var data = "your_data_here";
var xhr = new XMLHttpRequest();
xhr.open("POST", "your_php_script.php", true);
xhr.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
xhr.send("data=" + data);