Example functions.php with activated WordPress 5 features

listing-21-3.php

<?php
/**
 * WH HTML Vorlage functions and definitions
 *
 * @link @link https://developer.wordpress.org/themes/basics/theme-functions/
 *
 * @package WH_HTML_Vorlage
 */

/**
 * WH HTML Vorlage includes theme support for WordPress 5 features.
 * This topic is covered in chapter 21 Theme Development of the WordPress-Handuch https://wordpress-handbuch.com
 */

if ( ! function_exists( 'wh_html_theme_setup' ) ) {
	/**
	 * Sets up theme defaults and registers support for various WordPress features.
	 *
	 * Note that this function is hooked into the after_setup_theme hook, which
	 * runs before the init hook. The init hook is too late for some features, such
	 * as indicating support for post thumbnails.
	 */
	function wh_html_theme_setup() {
		add_theme_support( 'post-thumbnails' );
		add_theme_support( 'align-wide' );
		add_theme_support( 'automatic-feed-links' );
		add_theme_support( 'custom-background', array( 'default-image' => '%1$s/images/pic01.jpg', 'default-size' => 'cover' ) );
		add_theme_support( 'custom-header', array( 'default-image' => '%1$s/images/pic01.jpg', 'width' => 100, 'uploads' => true ) );
		add_theme_support( 'custom-logo', array( 'height' => 100, 'width' => 100 ) ) ;
		add_theme_support( 'editor-color-palette', array( array( 'name' => 'Schwarz wie die Nacht', 'slug' => 'myblack', 'color' => '#000000' ), array( 'name' => 'Weiß wie Schnee', 'slug' => 'mywhite', 'color' => '#ffffff' ) ) );
		add_theme_support( 'editor-font-sizes', array( array( 'name' => 'Klitzeklein', 'size' => 7, 'slug' => 'mysmall' ), array( 'name' => 'Gigantisch', 'size' => 50, 'slug' => 'mylarge' ) ) );
		add_theme_support( 'editor-styles' );
		add_editor_style( 'ihre-editor-styles.css' );
		add_theme_support( 'dark-editor-style' );
		add_theme_support( 'html5', array( 'comment-list', 'comment-form', 'search-form', 'gallery', 'caption' ) );
		add_theme_support( 'post-formats', array( 'aside', 'gallery' ) );
		add_theme_support( 'responsive-embeds' );
		add_theme_support( 'title-tag' );
		add_theme_support( 'wp-block-styles' );
	}

	add_image_size( 'stamp-size', 10, 10, true );
}
add_action( 'after_setup_theme', 'wh_html_theme_setup' );

/**
 * Enqueue scripts and styles.
 */
function wh_html_theme_scripts_and_styles() {
	wp_enqueue_style( 'wh-html-theme-style', get_stylesheet_uri(), array(), wp_get_theme()->get( 'Version' ) );
	wp_style_add_data( 'wh-html-theme-style', 'rtl', 'replace' );
	wp_enqueue_style( 'wh-html-theme-print-style', get_template_directory_uri() . '/print.css', array(), wp_get_theme()->get( 'Version' ), 'print' );
	wp_enqueue_script( 'wh-html-theme-custom', get_theme_file_uri( '/assets/js/main.js' ), array(), '1.1', true );
}
add_action( 'wp_enqueue_scripts', 'wh_html_theme_scripts_and_styles' );

/*
 * Make theme available for translation.
 * Translations can be filed in the /languages/ directory.
 * If you're building a theme based on Twenty Nineteen, use a find and replace
 * to change 'twentynineteen' to the name of your theme in all the template files.
 */
function wh_html_theme_translation() {
    load_theme_textdomain( 'wh-html-theme', get_template_directory() . '/languages' );
    load_child_theme_textdomain( 'wh-html-theme', get_stylesheet_directory() . '/languages' );
}
add_action( 'after_setup_theme', 'wh_html_theme_translation' );

// This theme uses wp_nav_menu() in one location.
function wh_html_theme_nav_menus() {
  register_nav_menus( array(
	  'primary' => __( 'In Ulm, um Ulm und um Ulm herum', 'wh-html-theme' ),
	) );
}
add_action( 'after_setup_theme', 'wh_html_theme_nav_menus' );

/**
 * Register widget area.
 *
 * @link https://developer.wordpress.org/themes/functionality/sidebars/#registering-a-sidebar
 */
function wh_html_theme_widgets_init() {
	register_sidebar( array(
		'name'          => 'Seitenleiste',
		'id'            => 'sidebar-1',
		'description'   => __( 'Hier erscheint die Übersetzung für die Beschreibung im Backend', 'wh_html_theme' ),
		'before_widget' => '<section id="%1$s" class="widget %2$s">',
		'after_widget'  => '</section>',
		'before_title'  => '<h2 class="widget-title">',
		'after_title'   => '</h2>',
	) );
}
add_action( 'widgets_init', 'wh_html_theme_widgets_init' );


// In case you want to organize additional Theme and template related functions:

//require get_template_directory() . '/inc/template-tags.php';

//require get_template_directory() . '/inc/template-functions.php';

//require get_template_directory() . '/inc/customizer.php';