wp_get_update_data()

function wp_get_update_data() {
	$counts = array( 'plugins' => 0, 'themes' => 0, 'wordpress' => 0, 'translations' => 0 );

	if ( $plugins = current_user_can( 'update_plugins' ) ) {
		$update_plugins = get_site_transient( 'update_plugins' );
		if ( ! empty( $update_plugins->response ) )
			$counts['plugins'] = count( $update_plugins->response );
	}

	if ( $themes = current_user_can( 'update_themes' ) ) {
		$update_themes = get_site_transient( 'update_themes' );
		if ( ! empty( $update_themes->response ) )
			$counts['themes'] = count( $update_themes->response );
	}

	if ( ( $core = current_user_can( 'update_core' ) ) && function_exists( 'get_core_updates' ) ) {
		$update_wordpress = get_core_updates( array('dismissed' => false) );
		if ( ! empty( $update_wordpress ) && ! in_array( $update_wordpress[0]->response, array('development', 'latest') ) && current_user_can('update_core') )
			$counts['wordpress'] = 1;
	}

	if ( ( $core || $plugins || $themes ) && wp_get_translation_updates() )
		$counts['translations'] = 1;

	$counts['total'] = $counts['plugins'] + $counts['themes'] + $counts['wordpress'] + $counts['translations'];
	$titles = array();
	if ( $counts['wordpress'] ) {
		/* translators: 1: Number of updates available to WordPress */
		$titles['wordpress'] = sprintf( __( '%d WordPress Update'), $counts['wordpress'] );
	}
	if ( $counts['plugins'] ) {
		/* translators: 1: Number of updates available to plugins */
		$titles['plugins'] = sprintf( _n( '%d Plugin Update', '%d Plugin Updates', $counts['plugins'] ), $counts['plugins'] );
	}
	if ( $counts['themes'] ) {
		/* translators: 1: Number of updates available to themes */
		$titles['themes'] = sprintf( _n( '%d Theme Update', '%d Theme Updates', $counts['themes'] ), $counts['themes'] );
	}
	if ( $counts['translations'] ) {
		$titles['translations'] = __( 'Translation Updates' );
	}

	$update_title = $titles ? esc_attr( implode( ', ', $titles ) ) : '';

	$update_data = array( 'counts' => $counts, 'title' => $update_title );
	/**
	 * Filters the returned array of update data for plugins, themes, and WordPress core.
	 *
	 * @since WP-3.5.0
	 *
	 * @param array $update_data {
	 *     Fetched update data.
	 *
	 *     @type array   $counts       An array of counts for available plugin, theme, and WordPress updates.
	 *     @type string  $update_title Titles of available updates.
	 * }
	 * @param array $titles An array of update counts and UI strings for available updates.
	 */
	return apply_filters( 'wp_get_update_data', $update_data, $titles );
}