Custom Newsletter Form

<?php
// Create a shortcode to display the newsletter form
function custom_newsletter_form_shortcode() {
    ob_start();
    ?>
    <form id="newsletter-form" method="post">
        <label for="newsletter-name">Name:</label>
        <input type="text" name="newsletter_name" id="newsletter-name" required />
        <label for="newsletter-email">Email:</label>
        <input type="email" name="newsletter_email" id="newsletter-email" required />
        <input type="submit" name="newsletter_submit" value="Subscribe" />
    </form>
    <?php
    return ob_get_clean();
}
add_shortcode('newsletter_form', 'custom_newsletter_form_shortcode');

// Handle form submission
function handle_newsletter_form_submission() {
    if (isset($_POST['newsletter_submit'])) {
        // Sanitize input data
        $name = sanitize_text_field($_POST['newsletter_name']);
        $email = sanitize_email($_POST['newsletter_email']);

        // Validate email
        if (!is_email($email)) {
            echo '<p class="error">Invalid email address.</p>';
            return;
        }

        // Prepare email content
        $to = get_option('admin_email');
        $subject = 'New Newsletter Subscription';
        $message = "Name: $name\nEmail: $email";
        $headers = array('Content-Type: text/plain; charset=UTF-8');

        // Send email
        wp_mail($to, $subject, $message, $headers);

        // Display a success message
        echo '<p class="success">Thank you for subscribing to our newsletter!</p>';
    }
}
add_action('wp_footer', 'handle_newsletter_form_submission');
?>