understrap/inc/extras.php

<?php
/**
 * Custom functions that act independently of the theme templates
 *
 * Eventually, some of the functionality here could be replaced by core features
 *
 * @package understrap
 */

/**
 * Get our wp_nav_menu() fallback, wp_page_menu(), to show a home link.
 *
 * @param array $args Configuration arguments.
 * @return array
 */
function understrap_page_menu_args( $args ) {
	$args['show_home'] = true;
	return $args;
}
add_filter( 'wp_page_menu_args', 'understrap_page_menu_args' );

/**
 * Adds custom classes to the array of body classes.
 *
 * @param array $classes Classes for the body element.
 * @return array
 */
function understrap_body_classes( $classes ) {
	// Adds a class of group-blog to blogs with more than 1 published author.
	if ( is_multi_author() ) {
		$classes[] = 'group-blog';
	}

	return $classes;
}
add_filter( 'body_class', 'understrap_body_classes' );

if ( ! function_exists( '_wp_render_title_tag' ) ) :
	/**
	 * Title shim for sites older than WordPress 4.1.
	 *
	 * @link https://make.wordpress.org/core/2014/10/29/title-tags-in-4-1/
	 * @todo Remove this function when WordPress 4.3 is released.
	 */

	function understrap_render_title() {
        ?>
        <title><?php wp_title( '|', true, 'right' ); ?></title>
    <?php
	}
	add_action( 'wp_head', 'understrap_render_title' );
endif;

/**
 * Sets the authordata global when viewing an author archive.
 *
 * This provides backwards compatibility with
 * http://core.trac.wordpress.org/changeset/25574
 *
 * It removes the need to call the_post() and rewind_posts() in an author
 * template to print information about the author.
 *
 * @global WP_Query $wp_query WordPress Query object.
 * @return void
 */
function understrap_setup_author() {
	global $wp_query;

	if ( $wp_query->is_author() && isset( $wp_query->post ) ) {
		$GLOBALS['authordata'] = get_userdata( $wp_query->post->post_author );
	}
}
add_action( 'wp', 'understrap_setup_author' );