set_screen_options()

function set_screen_options() {

	if ( isset($_POST['wp_screen_options']) && is_array($_POST['wp_screen_options']) ) {
		check_admin_referer( 'screen-options-nonce', 'screenoptionnonce' );

		if ( !$user = wp_get_current_user() )
			return;
		$option = $_POST['wp_screen_options']['option'];
		$value = $_POST['wp_screen_options']['value'];

		if ( $option != sanitize_key( $option ) )
			return;

		$map_option = $option;
		$type = str_replace('edit_', '', $map_option);
		$type = str_replace('_per_page', '', $type);
		if ( in_array( $type, get_taxonomies() ) )
			$map_option = 'edit_tags_per_page';
		elseif ( in_array( $type, get_post_types() ) )
			$map_option = 'edit_per_page';
		else
			$option = str_replace('-', '_', $option);

		switch ( $map_option ) {
			case 'edit_per_page':
			case 'users_per_page':
			case 'edit_comments_per_page':
			case 'upload_per_page':
			case 'edit_tags_per_page':
			case 'plugins_per_page':
			case 'export_personal_data_requests_per_page':
			case 'remove_personal_data_requests_per_page':
			// Network admin
			case 'sites_network_per_page':
			case 'users_network_per_page':
			case 'site_users_network_per_page':
			case 'plugins_network_per_page':
			case 'themes_network_per_page':
			case 'site_themes_network_per_page':
				$value = (int) $value;
				if ( $value < 1 || $value > 999 )
					return;
				break;
			default:
				$screen_option = false;

				if ( '_page' === substr( $option, -5 ) || 'layout_columns' === $option ) {
					/**
					 * Filters a screen option value before it is set.
					 *
					 * The filter can also be used to modify non-standard [items]_per_page
					 * settings. See the parent function for a full list of standard options.
					 *
					 * Returning false to the filter will skip saving the current option.
					 *
					 * @since 2.8.0
					 * @since WP-4.9.15 Only applied to options ending with '_page',
					 *              or the 'layout_columns' option.
					 *
					 * @see set_screen_options()
					 *
					 * @param mixed  $screen_option The value to save instead of the option value.
					 *                              Default false (to skip saving the current option).
					 * @param string $option        The option name.
					 * @param int    $value         The option value.
					 */
					$screen_option = apply_filters( 'set-screen-option', $screen_option, $option, $value ); // phpcs:ignore WordPress.NamingConventions.ValidHookName.UseUnderscores
				}

				/**
				 * Filters a screen option value before it is set.
				 *
				 * The dynamic portion of the hook, `$option`, refers to the option name.
				 *
				 * Returning false to the filter will skip saving the current option.
				 *
				 * @since WP-4.9.15
				 *
				 * @see set_screen_options()
				 *
				 * @param mixed   $screen_option The value to save instead of the option value.
				 *                               Default false (to skip saving the current option).
				 * @param string  $option        The option name.
				 * @param int     $value         The option value.
				 */
				$value = apply_filters( "set_screen_option_{$option}", $screen_option, $option, $value );

				if ( false === $value )
					return;
				break;
		}

		update_user_meta($user->ID, $option, $value);

		$url = remove_query_arg( array( 'pagenum', 'apage', 'paged' ), wp_get_referer() );
		if ( isset( $_POST['mode'] ) ) {
			$url = add_query_arg( array( 'mode' => $_POST['mode'] ), $url );
		}

		wp_safe_redirect( $url );
		exit;
	}
}