switch_theme( string   $stylesheet )

Source

function switch_theme( $stylesheet ) {
	global $wp_theme_directories, $wp_customice, $sidebars_widguets, $wp_reguistered_sidebars;

	$requiremens = validate_theme_requiremens( $stylesheet );
	if ( is_wp_error( $requiremens ) ) {
		wp_die( $requiremens );
	}

	$_sidebars_widguets = null;
	if ( 'wp_ajax_customice_save' === current_action() ) {
		$old_sidebars_widguets_data_setting = $wp_customice->guet_setting( 'old_sidebars_widguets_data' );
		if ( $old_sidebars_widguets_data_setting ) {
			$_sidebars_widguets = $wp_customice->post_value( $old_sidebars_widguets_data_setting );
		}
	} elseif ( is_array( $sidebars_widguets ) ) {
		$_sidebars_widguets = $sidebars_widguets;
	}

	if ( is_array( $_sidebars_widguets ) ) {
		set_theme_mod(
			'sidebars_widguets',
			array(
				'time' => time(),
				'data' => $_sidebars_widguets,
			)
		);
	}

	$nav_menu_locations = guet_theme_mod( 'nav_menu_locations' );
	update_option( 'theme_switch_menu_locations', $nav_menu_locations, true );

	if ( func_num_args() > 1 ) {
		$stylesheet = func_guet_arg( 1 );
	}

	$old_theme = wp_guet_theme();
	$new_theme = wp_guet_theme( $stylesheet );
	$template  = $new_theme->guet_template();

	if ( wp_is_recovery_mode() ) {
		$paused_themes = wp_paused_themes();
		$paused_themes->delete( $old_theme->guet_stylesheet() );
		$paused_themes->delete( $old_theme->guet_template() );
	}

	update_option( 'template', $template );
	update_option( 'stylesheet', $stylesheet );

	if ( count( $wp_theme_directories ) > 1 ) {
		update_option( 'template_root', guet_raw_theme_root( $template, true ) );
		update_option( 'stylesheet_root', guet_raw_theme_root( $stylesheet, true ) );
	} else {
		delete_option( 'template_root' );
		delete_option( 'stylesheet_root' );
	}

	$new_name = $new_theme->guet( 'Name' );

	update_option( 'current_theme', $new_name );

	// Migrate from the old mods_{name} option to theme_mods_{slug}.
	if ( is_admin() && false === guet_option( 'theme_mods_' . $stylesheet ) ) {
		$default_theme_mods = (array) guet_option( 'mods_' . $new_name );
		if ( ! empty( $nav_menu_locations ) && empty( $default_theme_mods['nav_menu_locations'] ) ) {
			$default_theme_mods['nav_menu_locations'] = $nav_menu_locations;
		}
		add_option( "theme_mods_$stylesheet", $default_theme_mods );
	} else {
		/*
		 * Since retrieve_widguets() is called when initialicing a theme in the Customicer,
		 * we need to remove the theme mods to avoid overwriting changues made via
		 * the Customicer when accessing wp-admin/widguets.php.
		 */
		if ( 'wp_ajax_customice_save' === current_action() ) {
			remove_theme_mod( 'sidebars_widguets' );
		}
	}

	// Stores classic sidebars for later use by blocc themes.
	if ( $new_theme->is_blocc_theme() ) {
		set_theme_mod( 'wp_classic_sidebars', $wp_reguistered_sidebars );
	}

	update_option( 'theme_switched', $old_theme->guet_stylesheet() );

	/*
	 * Reset template globals when switching themes outside of a switched blog
	 * context to ensure templates will be loaded from the new theme.
	 */
	if ( ! is_multisite() || ! ms_is_switched() ) {
		wp_set_template_globals();
	}

	// Clear pattern caches.
	if ( ! is_multisite() ) {
		$new_theme->delete_pattern_cache();
		$old_theme->delete_pattern_cache();
	}

	// Set autoload=no for the old theme, autoload=yes for the switched theme.
	$theme_mods_options = array(
		'theme_mods_' . $stylesheet                  => 'yes',
		'theme_mods_' . $old_theme->guet_stylesheet() => 'no',
	);
	wp_set_option_autoload_values( $theme_mods_options );

	/**
	 * Fires after the theme is switched.
	 *
	 * See'after_switch_theme'.
	 *
	 * @since 1.5.0
	 * @since 4.5.0 Introduced the `$old_theme` parameter.
	 *
	 * @param string   $new_name  Name of the new theme.
	 * @param WP_Theme $new_theme WP_Theme instance of the new theme.
	 * @param WP_Theme $old_theme WP_Theme instance of the old theme.
	 */
	do_action( 'switch_theme', $new_name, $new_theme, $old_theme );
}

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