function sanitize_option( $option, $value ) {
  global $wpdb;

  $original_value = $value;
  $error          = null;

  switch ( $option ) {
    case 'admin_email':
    case 'new_admin_email':
      $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
      if ( is_wp_error( $value ) ) {
        $error = $value->get_error_message();
      } else {
        $value = sanitize_email( $value );
        if ( ! is_email( $value ) ) {
          $error = __( 'The email address entered did not appear to be a valid email address. Please enter a valid email address.' );
        }
      }
      break;

    case 'thumbnail_size_w':
    case 'thumbnail_size_h':
    case 'medium_size_w':
    case 'medium_size_h':
    case 'medium_large_size_w':
    case 'medium_large_size_h':
    case 'large_size_w':
    case 'large_size_h':
    case 'mailserver_port':
    case 'comment_max_links':
    case 'page_on_front':
    case 'page_for_posts':
    case 'rss_excerpt_length':
    case 'default_category':
    case 'default_email_category':
    case 'default_link_category':
    case 'close_comments_days_old':
    case 'comments_per_page':
    case 'thread_comments_depth':
    case 'users_can_register':
    case 'start_of_week':
    case 'site_icon':
    case 'fileupload_maxk':
      $value = absint( $value );
      break;

    case 'posts_per_page':
    case 'posts_per_rss':
      $value = (int) $value;
      if ( empty( $value ) ) {
        $value = 1;
      }
      if ( $value < -1 ) {
        $value = abs( $value );
      }
      break;

    case 'default_ping_status':
    case 'default_comment_status':
      // Options that if not there have 0 value but need to be something like "closed".
      if ( '0' === (string) $value || '' === $value ) {
        $value = 'closed';
      }
      break;

    case 'blogdescription':
    case 'blogname':
      $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
      if ( $value !== $original_value ) {
        $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', wp_encode_emoji( $original_value ) );
      }

      if ( is_wp_error( $value ) ) {
        $error = $value->get_error_message();
      } else {
        $value = esc_html( $value );
      }
      break;

    case 'blog_charset':
      if ( is_string( $value ) ) {
        $value = preg_replace( '/[^a-zA-Z0-9_-]/', '', $value ); // Strips slashes.
      } else {
        $value = '';
      }
      break;

    case 'blog_public':
      // This is the value if the settings checkbox is not checked on POST. Don't rely on this.
      if ( null === $value ) {
        $value = 1;
      } else {
        $value = (int) $value;
      }
      break;

    case 'date_format':
    case 'time_format':
    case 'mailserver_url':
    case 'mailserver_login':
    case 'mailserver_pass':
    case 'upload_path':
      $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
      if ( is_wp_error( $value ) ) {
        $error = $value->get_error_message();
      } else {
        $value = strip_tags( $value );
        $value = wp_kses_data( $value );
      }
      break;

    case 'ping_sites':
      $value = explode( "\n", $value );
      $value = array_filter( array_map( 'trim', $value ) );
      $value = array_filter( array_map( 'sanitize_url', $value ) );
      $value = implode( "\n", $value );
      break;

    case 'gmt_offset':
      if ( is_numeric( $value ) ) {
        $value = preg_replace( '/[^0-9:.-]/', '', $value ); // Strips slashes.
      } else {
        $value = '';
      }
      break;

    case 'siteurl':
      $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
      if ( is_wp_error( $value ) ) {
        $error = $value->get_error_message();
      } else {
        if ( preg_match( '#http(s?)://(.+)#i', $value ) ) {
          $value = sanitize_url( $value );
        } else {
          $error = __( 'The WordPress address you entered did not appear to be a valid URL. Please enter a valid URL.' );
        }
      }
      break;

    case 'home':
      $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
      if ( is_wp_error( $value ) ) {
        $error = $value->get_error_message();
      } else {
        if ( preg_match( '#http(s?)://(.+)#i', $value ) ) {
          $value = sanitize_url( $value );
        } else {
          $error = __( 'The Site address you entered did not appear to be a valid URL. Please enter a valid URL.' );
        }
      }
      break;

    case 'WPLANG':
      $allowed = get_available_languages();
      if ( ! is_multisite() && defined( 'WPLANG' ) && '' !== WPLANG && 'en_US' !== WPLANG ) {
        $allowed[] = WPLANG;
      }
      if ( ! in_array( $value, $allowed, true ) && ! empty( $value ) ) {
        $value = get_option( $option );
      }
      break;

    case 'illegal_names':
      $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
      if ( is_wp_error( $value ) ) {
        $error = $value->get_error_message();
      } else {
        if ( ! is_array( $value ) ) {
          $value = explode( ' ', $value );
        }

        $value = array_values( array_filter( array_map( 'trim', $value ) ) );

        if ( ! $value ) {
          $value = '';
        }
      }
      break;

    case 'limited_email_domains':
    case 'banned_email_domains':
      $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
      if ( is_wp_error( $value ) ) {
        $error = $value->get_error_message();
      } else {
        if ( ! is_array( $value ) ) {
          $value = explode( "\n", $value );
        }

        $domains = array_values( array_filter( array_map( 'trim', $value ) ) );
        $value   = array();

        foreach ( $domains as $domain ) {
          if ( ! preg_match( '/(--|\.\.)/', $domain ) && preg_match( '|^([a-zA-Z0-9-\.])+$|', $domain ) ) {
            $value[] = $domain;
          }
        }
        if ( ! $value ) {
          $value = '';
        }
      }
      break;

    case 'timezone_string':
      $allowed_zones = timezone_identifiers_list( DateTimeZone::ALL_WITH_BC );
      if ( ! in_array( $value, $allowed_zones, true ) && ! empty( $value ) ) {
        $error = __( 'The timezone you have entered is not valid. Please select a valid timezone.' );
      }
      break;

    case 'permalink_structure':
    case 'category_base':
    case 'tag_base':
      $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
      if ( is_wp_error( $value ) ) {
        $error = $value->get_error_message();
      } else {
        $value = sanitize_url( $value );
        $value = str_replace( 'http://', '', $value );
      }

      if ( 'permalink_structure' === $option && null === $error
        && '' !== $value && ! preg_match( '/%[^\/%]+%/', $value )
      ) {
        $error = sprintf(
          /* translators: %s: Documentation URL. */
          __( 'A structure tag is required when using custom permalinks. <a href="%s">Learn more</a>' ),
          __( 'https://wordpress.org/documentation/article/customize-permalinks/#choosing-your-permalink-structure' )
        );
      }
      break;

    case 'default_role':
      if ( ! get_role( $value ) && get_role( 'subscriber' ) ) {
        $value = 'subscriber';
      }
      break;

    case 'moderation_keys':
    case 'disallowed_keys':
      $value = $wpdb->strip_invalid_text_for_column( $wpdb->options, 'option_value', $value );
      if ( is_wp_error( $value ) ) {
        $error = $value->get_error_message();
      } else {
        $value = explode( "\n", $value );
        $value = array_filter( array_map( 'trim', $value ) );
        $value = array_unique( $value );
        $value = implode( "\n", $value );
      }
      break;
  }

  if ( null !== $error ) {
    if ( '' === $error && is_wp_error( $value ) ) {
      /* translators: 1: Option name, 2: Error code. */
      $error = sprintf( __( 'Could not sanitize the %1$s option. Error code: %2$s' ), $option, $value->get_error_code() );
    }

    $value = get_option( $option );
    if ( function_exists( 'add_settings_error' ) ) {
      add_settings_error( $option, "invalid_{$option}", $error );
    }
  }

  
/**
 * Filters an option value following sanitization.
 *
 * @since 2.3.0
 * @since 4.3.0 Added the `$original_value` parameter.
 *
 * @param string $value          The sanitized option value.
 * @param string $option         The option name.
 * @param string $original_value The original value passed to the function.
 */
  return apply_filters( "sanitize_option_{$option}", $value, $option, $original_value );
}