public static function enter_api_key() {
    if ( ! current_user_can( 'manage_options' ) ) {
      die( __( 'Cheatin’ uh?', 'akismet' ) );
    }

    if ( !wp_verify_nonce( $_POST['_wpnonce'], self::NONCE ) )
      return false;

    foreach( array( 'akismet_strictness', 'akismet_show_user_comments_approved' ) as $option ) {
      update_option( $option, isset( $_POST[$option] ) && (int) $_POST[$option] == 1 ? '1' : '0' );
    }

    if ( ! empty( $_POST['akismet_comment_form_privacy_notice'] ) ) {
      self::set_form_privacy_notice_option( $_POST['akismet_comment_form_privacy_notice'] );
    } else {
      self::set_form_privacy_notice_option( 'hide' );
    }

    if ( Akismet::predefined_api_key() ) {
      return false; //shouldn't have option to save key if already defined
    }
    
    $new_key = preg_replace( '/[^a-f0-9]/i', '', $_POST['key'] );
    $old_key = Akismet::get_api_key();

    if ( empty( $new_key ) ) {
      if ( !empty( $old_key ) ) {
        delete_option( 'wordpress_api_key' );
        self::$notices[] = 'new-key-empty';
      }
    }
    elseif ( $new_key != $old_key ) {
      self::save_key( $new_key );
    }

    return true;
  }