/**
 * Handle the Contact page form submission and email it to the site admin.
 */
function hc_handle_contact_submit() {
    if ( ! isset( $_POST['hc_contact_nonce'] ) || ! wp_verify_nonce( $_POST['hc_contact_nonce'], 'hc_contact_submit' ) ) {
        wp_safe_redirect( add_query_arg( 'contact', 'error', home_url( '/contact/' ) ) );
        exit;
    }

    // Honeypot field: real users never fill this in.
    if ( ! empty( $_POST['hc_website'] ) ) {
        wp_safe_redirect( add_query_arg( 'contact', 'success', home_url( '/contact/' ) ) );
        exit;
    }

    $name    = isset( $_POST['name'] ) ? sanitize_text_field( wp_unslash( $_POST['name'] ) ) : '';
    $email   = isset( $_POST['email'] ) ? sanitize_email( wp_unslash( $_POST['email'] ) ) : '';
    $message = isset( $_POST['message'] ) ? sanitize_textarea_field( wp_unslash( $_POST['message'] ) ) : '';

    if ( empty( $name ) || empty( $message ) || ! is_email( $email ) ) {
        wp_safe_redirect( add_query_arg( 'contact', 'error', home_url( '/contact/' ) ) );
        exit;
    }

    $to      = get_option( 'admin_email' );
    $subject = sprintf( '[Health Calculators] New contact message from %s', $name );
    $body    = "You have a new message from the Health Calculators contact form.\n\n"
             . "Name: {$name}\n"
             . "Email: {$email}\n\n"
             . "Message:\n{$message}\n";
    $headers = array( 'Content-Type: text/plain; charset=UTF-8', "Reply-To: {$name} <{$email}>" );

    $sent = wp_mail( $to, $subject, $body, $headers );

    wp_safe_redirect( add_query_arg( 'contact', $sent ? 'success' : 'error', home_url( '/contact/' ) ) );
    exit;
}
add_action( 'admin_post_hc_contact_submit', 'hc_handle_contact_submit' );
add_action( 'admin_post_nopriv_hc_contact_submit', 'hc_handle_contact_submit' );
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