What could be the potential reasons for a non-responsive "submit button" in a PHP form?

The potential reasons for a non-responsive "submit button" in a PHP form could be due to errors in the form validation process, JavaScript conflicts, or issues with the server-side processing of the form data. To solve this issue, ensure that the form is properly validated, check for any JavaScript errors that may be preventing the form submission, and verify that the PHP script handling the form submission is functioning correctly. 

<?php
if ($_SERVER["REQUEST_METHOD"] == "POST") {
    // Validate form data
    // Process form data
}
?>
<form method="post" action="<?php echo $_SERVER['PHP_SELF']; ?>">
    <!-- Form fields go here -->
    <input type="submit" name="submit" value="Submit">
</form>

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