Theme_Upgrader::install( string $package, array $args = array() ): bool|WP_Error

Source

public function install( $package, $args = array() ) {
	$defaults    = array(
		'clear_update_cache' => true,
		'overwrite_package'  => false, // Do not overwrite files.
	);
	$parsed_args = wp_parse_args( $args, $defaults );

	$this->init();
	$this->install_strings();

	add_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
	add_filter( 'upgrader_post_install', array( $this, 'check_parent_theme_filter' ), 10, 3 );

	if ( $parsed_args['clear_update_cache'] ) {
		// Clear cache so wp_update_themes() knows about the new theme.
		add_action( 'upgrader_process_complete', 'wp_clean_themes_cache', 9, 0 );
	}

	$this->run(
		array(
			'package'           => $package,
			'destination'       => get_theme_root(),
			'clear_destination' => $parsed_args['overwrite_package'],
			'clear_working'     => true,
			'hook_extra'        => array(
				'type'   => 'theme',
				'action' => 'install',
			),
		)
	);

	remove_action( 'upgrader_process_complete', 'wp_clean_themes_cache', 9 );
	remove_filter( 'upgrader_source_selection', array( $this, 'check_package' ) );
	remove_filter( 'upgrader_post_install', array( $this, 'check_parent_theme_filter' ) );

	if ( ! $this->result || is_wp_error( $this->result ) ) {
		return $this->result;
	}

	// Refresh the Theme Update information.
	wp_clean_themes_cache( $parsed_args['clear_update_cache'] );

	if ( $parsed_args['overwrite_package'] ) {
		/** This action is documented in wp-admin/includes/class-plugin-upgrader.php */
		do_action( 'upgrader_overwrote_package', $package, $this->new_theme_data, 'theme' );
	}

	return true;
}

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