wp_update_plugins

wp_update_plugins是一个更新所有安装在WordPress网站上的插件的函数: 该函数检查WordPress插件库的更新，并在必要时应用它们: 该函数用于确保网站上安装的所有插件都是最新的，并具有最新的安全修复和功能。

根据WordPress.org上托管的最新版本，检查插件的可用更新。

尽管它的名字是这样，这个函数实际上并不执行任何更新，它只是检查可用的更新。

一个已安装的所有插件的列表将被发送到WP，同时还有网站的定位。

检查位于api.wordpress.org的WordPress服务器。只会在WordPress没有安装时进行检查。

function wp_update_plugins( $extra_stats = array() ) {
	if ( wp_installing() ) {
		return;
	}

	// Include an unmodified $wp_version.
	require ABSPATH . WPINC . '/version.php';

	// If running blog-side, bail unless we've not checked in the last 12 hours.
	if ( ! function_exists( 'get_plugins' ) ) {
		require_once ABSPATH . 'wp-admin/includes/plugin.php';
	}

	$plugins      = get_plugins();
	$translations = wp_get_installed_translations( 'plugins' );

	$active  = get_option( 'active_plugins', array() );
	$current = get_site_transient( 'update_plugins' );

	if ( ! is_object( $current ) ) {
		$current = new stdClass;
	}

	$updates               = new stdClass;
	$updates->last_checked = time();
	$updates->response     = array();
	$updates->translations = array();
	$updates->no_update    = array();

	$doing_cron = wp_doing_cron();

	// Check for update on a different schedule, depending on the page.
	switch ( current_filter() ) {
		case 'upgrader_process_complete':
			$timeout = 0;
			break;
		case 'load-update-core.php':
			$timeout = MINUTE_IN_SECONDS;
			break;
		case 'load-plugins.php':
		case 'load-update.php':
			$timeout = HOUR_IN_SECONDS;
			break;
		default:
			if ( $doing_cron ) {
				$timeout = 2 * HOUR_IN_SECONDS;
			} else {
				$timeout = 12 * HOUR_IN_SECONDS;
			}
	}

	$time_not_changed = isset( $current->last_checked ) && $timeout > ( time() - $current->last_checked );

	if ( $time_not_changed && ! $extra_stats ) {
		$plugin_changed = false;

		foreach ( $plugins as $file => $p ) {
			$updates->checked[ $file ] = $p['Version'];

			if ( ! isset( $current->checked[ $file ] ) || (string) $current->checked[ $file ] !== (string) $p['Version'] ) {
				$plugin_changed = true;
			}
		}

		if ( isset( $current->response ) && is_array( $current->response ) ) {
			foreach ( $current->response as $plugin_file => $update_details ) {
				if ( ! isset( $plugins[ $plugin_file ] ) ) {
					$plugin_changed = true;
					break;
				}
			}
		}

		// Bail if we've checked recently and if nothing has changed.
		if ( ! $plugin_changed ) {
			return;
		}
	}

	// Update last_checked for current to prevent multiple blocking requests if request hangs.
	$current->last_checked = time();
	set_site_transient( 'update_plugins', $current );

	$to_send = compact( 'plugins', 'active' );

	$locales = array_values( get_available_languages() );

	/**
	 * Filters the locales requested for plugin translations.
	 *
	 * @since 3.7.0
	 * @since 4.5.0 The default value of the `$locales` parameter changed to include all locales.
	 *
	 * @param string[] $locales Plugin locales. Default is all available locales of the site.
	 */
	$locales = apply_filters( 'plugins_update_check_locales', $locales );
	$locales = array_unique( $locales );

	if ( $doing_cron ) {
		$timeout = 30; // 30 seconds.
	} else {
		// Three seconds, plus one extra second for every 10 plugins.
		$timeout = 3 + (int) ( count( $plugins ) / 10 );
	}

	$options = array(
		'timeout'    => $timeout,
		'body'       => array(
			'plugins'      => wp_json_encode( $to_send ),
			'translations' => wp_json_encode( $translations ),
			'locale'       => wp_json_encode( $locales ),
			'all'          => wp_json_encode( true ),
		),
		'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
	);

	if ( $extra_stats ) {
		$options['body']['update_stats'] = wp_json_encode( $extra_stats );
	}

	$url      = 'http://api.wordpress.org/plugins/update-check/1.1/';
	$http_url = $url;
	$ssl      = wp_http_supports( array( 'ssl' ) );

	if ( $ssl ) {
		$url = set_url_scheme( $url, 'https' );
	}

	$raw_response = wp_remote_post( $url, $options );

	if ( $ssl && is_wp_error( $raw_response ) ) {
		trigger_error(
			sprintf(
				/* translators: %s: Support forums URL. */
				__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server’s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
				__( 'https://wordpress.org/support/forums/' )
			) . ' ' . __( '(WordPress could not establish a secure connection to WordPress.org. Please contact your server administrator.)' ),
			headers_sent() || WP_DEBUG ? E_USER_WARNING : E_USER_NOTICE
		);
		$raw_response = wp_remote_post( $http_url, $options );
	}

	if ( is_wp_error( $raw_response ) || 200 !== wp_remote_retrieve_response_code( $raw_response ) ) {
		return;
	}

	$response = json_decode( wp_remote_retrieve_body( $raw_response ), true );

	if ( $response && is_array( $response ) ) {
		$updates->response     = $response['plugins'];
		$updates->translations = $response['translations'];
		$updates->no_update    = $response['no_update'];
	}

	// Support updates for any plugins using the `Update URI` header field.
	foreach ( $plugins as $plugin_file => $plugin_data ) {
		if ( ! $plugin_data['UpdateURI'] || isset( $updates->response[ $plugin_file ] ) ) {
			continue;
		}

		$hostname = wp_parse_url( sanitize_url( $plugin_data['UpdateURI'] ), PHP_URL_HOST );

		/**
		 * Filters the update response for a given plugin hostname.
		 *
		 * The dynamic portion of the hook name, `$hostname`, refers to the hostname
		 * of the URI specified in the `Update URI` header field.
		 *
		 * @since 5.8.0
		 *
		 * @param array|false $update {
		 *     The plugin update data with the latest details. Default false.
		 *
		 *     @type string $id           Optional. ID of the plugin for update purposes, should be a URI
		 *                                specified in the `Update URI` header field.
		 *     @type string $slug         Slug of the plugin.
		 *     @type string $version      The version of the plugin.
		 *     @type string $url          The URL for details of the plugin.
		 *     @type string $package      Optional. The update ZIP for the plugin.
		 *     @type string $tested       Optional. The version of WordPress the plugin is tested against.
		 *     @type string $requires_php Optional. The version of PHP which the plugin requires.
		 *     @type bool   $autoupdate   Optional. Whether the plugin should automatically update.
		 *     @type array  $icons        Optional. Array of plugin icons.
		 *     @type array  $banners      Optional. Array of plugin banners.
		 *     @type array  $banners_rtl  Optional. Array of plugin RTL banners.
		 *     @type array  $translations {
		 *         Optional. List of translation updates for the plugin.
		 *
		 *         @type string $language   The language the translation update is for.
		 *         @type string $version    The version of the plugin this translation is for.
		 *                                  This is not the version of the language file.
		 *         @type string $updated    The update timestamp of the translation file.
		 *                                  Should be a date in the `YYYY-MM-DD HH:MM:SS` format.
		 *         @type string $package    The ZIP location containing the translation update.
		 *         @type string $autoupdate Whether the translation should be automatically installed.
		 *     }
		 * }
		 * @param array       $plugin_data      Plugin headers.
		 * @param string      $plugin_file      Plugin filename.
		 * @param string[]    $locales          Installed locales to look up translations for.
		 */
		$update = apply_filters( "update_plugins_{$hostname}", false, $plugin_data, $plugin_file, $locales );

		if ( ! $update ) {
			continue;
		}

		$update = (object) $update;

		// Is it valid? We require at least a version.
		if ( ! isset( $update->version ) ) {
			continue;
		}

		// These should remain constant.
		$update->id     = $plugin_data['UpdateURI'];
		$update->plugin = $plugin_file;

		// WordPress needs the version field specified as 'new_version'.
		if ( ! isset( $update->new_version ) ) {
			$update->new_version = $update->version;
		}

		// Handle any translation updates.
		if ( ! empty( $update->translations ) ) {
			foreach ( $update->translations as $translation ) {
				if ( isset( $translation['language'], $translation['package'] ) ) {
					$translation['type'] = 'plugin';
					$translation['slug'] = isset( $update->slug ) ? $update->slug : $update->id;

					$updates->translations[] = $translation;
				}
			}
		}

		unset( $updates->no_update[ $plugin_file ], $updates->response[ $plugin_file ] );

		if ( version_compare( $update->new_version, $plugin_data['Version'], '>' ) ) {
			$updates->response[ $plugin_file ] = $update;
		} else {
			$updates->no_update[ $plugin_file ] = $update;
		}
	}

	$sanitize_plugin_update_payload = static function( &$item ) {
		$item = (object) $item;

		unset( $item->translations, $item->compatibility );

		return $item;
	};

	array_walk( $updates->response, $sanitize_plugin_update_payload );
	array_walk( $updates->no_update, $sanitize_plugin_update_payload );

	set_site_transient( 'update_plugins', $updates );
}