Add Plausible analytics tracking class to FunnelKit Checkout place order button

gistfile1.txt

add_filter( 'woocommerce_order_button_html', function( $button_html ) {
	// Check if we're on a FunnelKit checkout page
	if ( ! function_exists( 'wfacp_template' ) ) {
		return $button_html;
	}

	$instance = wfacp_template();
	if ( ! $instance ) {
		return $button_html;
	}

	// Add Plausible event class to the button
	// Handle both <button> and <input> element types
	if ( strpos( $button_html, '<button' ) !== false ) {
		// For <button> elements, add class to existing class attribute
		$button_html = preg_replace(
			'/(<button[^>]*class=["\'])([^"\']*)(["\'])/i',
			'$1$2 plausible-event-name=Complete+purchase$3',
			$button_html
		);
	} elseif ( strpos( $button_html, '<input' ) !== false ) {
		// For <input> elements, add class to existing class attribute
		$button_html = preg_replace(
			'/(<input[^>]*class=["\'])([^"\']*)(["\'])/i',
			'$1$2 plausible-event-name=Complete+purchase$3',
			$button_html
		);
	}

	return $button_html;
}, 100 );