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How can data from dynamically filled form fields be submitted to a separate PHP processing page?

To submit data from dynamically filled form fields to a separate PHP processing page, you can use JavaScript to gather the form data and send it to the PHP page using AJAX. This allows you to dynamically capture user input and process it on the server side without refreshing the page.

php 
```php
// JavaScript code to gather form data and send it to PHP processing page
<script>
  $(document).ready(function(){
    $('#submitBtn').click(function(){
      var formData = $('#myForm').serialize();
      
      $.ajax({
        type: 'POST',
        url: 'processing_page.php',
        data: formData,
        success: function(response){
          // Handle the response from the PHP processing page
          console.log(response);
        }
      });
    });
  });
</script>
```

In the above code snippet, replace '#submitBtn' with the ID of your submit button, '#myForm' with the ID of your form, and 'processing_page.php' with the path to your PHP processing page. The PHP processing page can then retrieve the form data using $_POST superglobal.

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