functions.php

<?php
/**
 * theme support
 */
 if ( ! function_exists( 'wpbeg_setup' ) ) {
	function wpbeg_setup() {
		$args = array(
			'default_color' => "#fff"
		);
		load_theme_textdomain( 'wpbeg', get_template_directory() . '/languages' );
		add_theme_support( 'title-tag' );
		add_theme_support( 'post-thumbnails' );
		add_theme_support( 'automatic-feed-links' );
		add_theme_support( 'editor-styles' );
		add_theme_support( "custom-background", $args );
		add_theme_support( "custom-header", $args );
	}
	register_nav_menus( array(
		'global_nav' => esc_html__( 'global navigation', 'wpbeg' ),
	) );
}
add_action( 'after_setup_theme', 'wpbeg_setup' );

if ( ! isset( $content_width ) ) {
	$content_width = 960;
}

/**
 * Title output
 */
function wpbeg_title( $title ) {
	if ( is_front_page() && is_home() ) {
		$title = get_bloginfo( 'name', 'display' );
	} elseif ( is_singular() ) {
		$title = single_post_title( '', false );
	}
	return $title;
}
add_filter( 'pre_get_document_title', 'wpbeg_title' );

/**
 * Read stylesheet, script
 */
function wpbeg_script() {
	$locale = get_locale();
	$locale = apply_filters( 'theme_locale', $locale, 'wpbeg' );
	wp_enqueue_style( 'font-awesome', get_template_directory_uri() . '/css/font-awesome.css', array(), '4.7.0' );
	if( $locale == 'ja' ) {
		wp_enqueue_style( 'wpbeg-mplus1p', '//fonts.googleapis.com/earlyaccess/mplus1p.css', array() );
	}
	wp_enqueue_style( 'wpbeg-Sacramento', '//fonts.googleapis.com/css?family=Sacramento&amp;amp;subset=latin-ext', array() );
	wp_enqueue_style( 'wpbeg-normalize', get_template_directory_uri() . '/css/normalize.css', array(), '4.5.0' );
	wp_enqueue_style( 'wpbeg-wpbeg', get_template_directory_uri() . '/css/wpbeg.css', array(), '1.0.0' );
	wp_enqueue_style( 'wpbeg-style', get_template_directory_uri() . '/style.css', array(), '1.0.0' );
}
add_action( 'wp_enqueue_scripts', 'wpbeg_script' );

/**
 * Read editor-style
 */
function wpbeg_theme_add_editor_styles() {
	//旧コード
	// add_editor_style( get_template_directory_uri() . "/css/editor-style.css" );
	//新コード
	$editor_style_url = get_theme_file_uri( '/css/editor-style.css' );
	wp_enqueue_style( 'block-editor-style', $editor_style_url );
}
add_action( 'enqueue_block_editor_assets', 'wpbeg_theme_add_editor_styles' );

function wpbeg_widgets_init() {
	register_sidebar (
		array (
			'name'          => esc_html__( 'Category widget', 'wpbeg' ),
			'id'            => 'category_widget',
			'description'   => esc_html__( 'It is widget for categories', 'wpbeg' ),
			'before_widget' => '<div id="%1$s" class="widget %2$s">',
			'after_widget'  => '</div>',
			'before_title'  => '<h2><i class="fa fa-folder-open" aria-hidden="true"></i>',
			'after_title'   => "</h2>\n",
		)
	);
	register_sidebar (
		array (
			'name'          => esc_html__( 'Tag widget', 'wpbeg' ),
			'id'            => 'tag_widget',
			'description'   => esc_html__( 'It is widget for tags', 'wpbeg' ),
			'before_widget' => '<div id="%1$s" class="widget %2$s">',
			'after_widget'  => '</div>',
			'before_title'  => '<h2><i class="fa fa-tags" aria-hidden="true"></i>',
			'after_title'   => "</h2>\n",
		)
	);
	register_sidebar (
	  array (
			'name'          => esc_html__( 'Archive widget', 'wpbeg' ),
			'id'            => 'archive_widget',
			'description'   => esc_html__( 'It is widget for archives', 'wpbeg' ),
			'before_widget' => '<div id="%1$s" class="widget %2$s">',
			'after_widget'  => '</div>',
			'before_title'  => '<h2><i class="fa fa-archive" aria-hidden="true"></i>',
			'after_title'   => "</h2>\n",
	  )
	);
	register_sidebar (
	  array (
			'name'          => esc_html__( 'freedom widget', 'wpbeg' ),
			'id'            => 'freedom_widget',
			'description'   => esc_html__( 'It is widget for freedom', 'wpbeg' ),
			'before_widget' => '<div id="%1$s" class="widget %2$s">',
			'after_widget'  => '</div>',
			'before_title'  => '<h2>',
			'after_title'   => "</h2>\n",
	  )
	);
}
add_action( 'widgets_init', 'wpbeg_widgets_init' );

// remove_action( 'wp_head', 'wp_generator' );