+/**
+ * Check theme versions against the latest versions hosted on WordPress.org.
+ *
+ * A list of all themes installed in sent to WP. Checks against the
+ * WordPress server at api.wordpress.org. Will only check if WordPress isn't
+ * installing.
+ *
+ * @package WordPress
+ * @since 2.7.0
+ * @uses $wp_version Used to notify the WordPress version.
+ *
+ * @return mixed Returns null if update is unsupported. Returns false if check is too soon.
+ */
+function wp_update_themes() {
+ include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
+
+ if ( defined( 'WP_INSTALLING' ) )
+ return false;
+
+ if ( !function_exists( 'get_themes' ) )
+ require_once( ABSPATH . 'wp-includes/theme.php' );
+
+ $installed_themes = get_themes( );
+ $last_update = get_site_transient( 'update_themes' );
+ if ( ! is_object($last_update) )
+ $last_update = new stdClass;
+
+ // Check for updated every 60 minutes if hitting update pages; else, check every 12 hours.
+ $timeout = in_array( current_filter(), array( 'load-themes.php', 'load-update.php', 'load-update-core.php' ) ) ? 3600 : 43200;
+ $time_not_changed = isset( $last_update->last_checked ) && $timeout > ( time( ) - $last_update->last_checked );
+
+ $themes = array();
+ $checked = array();
+ $exclude_fields = array('Template Files', 'Stylesheet Files', 'Status', 'Theme Root', 'Theme Root URI', 'Template Dir', 'Stylesheet Dir', 'Description', 'Tags', 'Screenshot');
+
+ // Put slug of current theme into request.
+ $themes['current_theme'] = get_option( 'stylesheet' );
+
+ foreach ( (array) $installed_themes as $theme_title => $theme ) {
+ $themes[$theme['Stylesheet']] = array();
+ $checked[$theme['Stylesheet']] = $theme['Version'];
+
+ $themes[$theme['Stylesheet']]['Name'] = $theme['Name'];
+ $themes[$theme['Stylesheet']]['Version'] = $theme['Version'];
+
+ foreach ( (array) $theme as $key => $value ) {
+ if ( !in_array($key, $exclude_fields) )
+ $themes[$theme['Stylesheet']][$key] = $value;
+ }
+ }
+
+ $theme_changed = false;
+ foreach ( $checked as $slug => $v ) {
+ $update_request->checked[ $slug ] = $v;
+
+ if ( !isset( $last_update->checked[ $slug ] ) || strval($last_update->checked[ $slug ]) !== strval($v) )
+ $theme_changed = true;
+ }
+
+ if ( isset ( $last_update->response ) && is_array( $last_update->response ) ) {
+ foreach ( $last_update->response as $slug => $update_details ) {
+ if ( ! isset($checked[ $slug ]) ) {
+ $theme_changed = true;
+ break;
+ }
+ }
+ }
+
+ if ( $time_not_changed && !$theme_changed )
+ return false;
+
+ // Update last_checked for current to prevent multiple blocking requests if request hangs
+ $last_update->last_checked = time();
+ set_site_transient( 'update_themes', $last_update );
+
+ $options = array(
+ 'timeout' => ( ( defined('DOING_CRON') && DOING_CRON ) ? 30 : 3),
+ 'body' => array( 'themes' => serialize( $themes ) ),
+ 'user-agent' => 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' )
+ );
+
+ $raw_response = wp_remote_post( 'http://api.wordpress.org/themes/update-check/1.0/', $options );
+
+ if ( is_wp_error( $raw_response ) || 200 != wp_remote_retrieve_response_code( $raw_response ) )
+ return false;
+
+ $new_update = new stdClass;
+ $new_update->last_checked = time( );
+ $new_update->checked = $checked;
+
+ $response = unserialize( wp_remote_retrieve_body( $raw_response ) );
+ if ( false !== $response )
+ $new_update->response = $response;
+
+ set_site_transient( 'update_themes', $new_update );
+}
+
+/*
+ * Collect counts and UI strings for available updates
+ *
+ * @since 3.3.0
+ *
+ * @return array
+ */
+function wp_get_update_data() {
+ $counts = array( 'plugins' => 0, 'themes' => 0, 'wordpress' => 0 );
+
+ if ( current_user_can( 'update_plugins' ) ) {
+ $update_plugins = get_site_transient( 'update_plugins' );
+ if ( ! empty( $update_plugins->response ) )
+ $counts['plugins'] = count( $update_plugins->response );
+ }
+
+ if ( current_user_can( 'update_themes' ) ) {
+ $update_themes = get_site_transient( 'update_themes' );
+ if ( ! empty( $update_themes->response ) )
+ $counts['themes'] = count( $update_themes->response );
+ }
+
+ if ( function_exists( 'get_core_updates' ) && current_user_can( 'update_core' ) ) {
+ $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;
+ }
+
+ $counts['total'] = $counts['plugins'] + $counts['themes'] + $counts['wordpress'];
+ $update_title = array();
+ if ( $counts['wordpress'] )
+ $update_title[] = sprintf(__('%d WordPress Update'), $counts['wordpress']);
+ if ( $counts['plugins'] )
+ $update_title[] = sprintf(_n('%d Plugin Update', '%d Plugin Updates', $counts['plugins']), $counts['plugins']);
+ if ( $counts['themes'] )
+ $update_title[] = sprintf(_n('%d Theme Update', '%d Theme Updates', $counts['themes']), $counts['themes']);
+
+ $update_title = ! empty( $update_title ) ? esc_attr( implode( ', ', $update_title ) ) : '';
+
+ return array( 'counts' => $counts, 'title' => $update_title );
+}
+
+function _maybe_update_core() {
+ include ABSPATH . WPINC . '/version.php'; // include an unmodified $wp_version
+
+ $current = get_site_transient( 'update_core' );
+
+ if ( isset( $current->last_checked ) &&
+ 43200 > ( time() - $current->last_checked ) &&
+ isset( $current->version_checked ) &&
+ $current->version_checked == $wp_version )
+ return;
+
+ wp_version_check();
+}
+/**
+ * Check the last time plugins were run before checking plugin versions.
+ *
+ * This might have been backported to WordPress 2.6.1 for performance reasons.
+ * This is used for the wp-admin to check only so often instead of every page
+ * load.
+ *
+ * @since 2.7.0
+ * @access private
+ */