add_filter('wpcf7_validate_select', 'cf7bl_validate_limit', 20, 2);
add_filter('wpcf7_validate_select*', 'cf7bl_validate_limit', 20, 2);

function cf7bl_validate_limit($result, $tag) {

    global $wpdb;

    $field_name = $tag->name;
    $settings = cf7bl_get_settings();

    foreach ($settings as $form_id => $fields) {

        if (!isset($fields[$field_name])) {
            continue;
        }

        $selected = isset($_POST[$field_name])
            ? sanitize_text_field($_POST[$field_name])
            : '';

        if (!$selected || !isset($fields[$field_name][$selected])) {
            continue;
        }

        $limit = (int) $fields[$field_name][$selected];

        $table = $wpdb->prefix . 'cf7_data_entry';

        $count = (int) $wpdb->get_var(
            $wpdb->prepare(
                "SELECT COUNT(*)
                 FROM $table
                 WHERE name = %s
                 AND value = %s",
                $field_name,
                $selected
            )
        );

        if ($count >= $limit) {
            $result->invalidate(
                $tag,
                'Diese Option ist leider bereits ausgebucht.'
            );
        }
    }

    return $result;
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