Issues in update.php (ticket-41057) - Issues in ticket-41057 - ntwb/wordpress - Measure and Improve Code Quality continuously with Scrutinizer

Issues (4967)

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Cross-Site Scripting

Cross-Site Scripting enables an attacker to inject code into the response of a web-request that is viewed by other users. It can for example be used to bypass access controls, or even to take over other users' accounts.

File Exposure

File Exposure allows an attacker to gain access to local files that he should not be able to access. These files can for example include database credentials, or other configuration files.

File Manipulation

File Manipulation enables an attacker to write custom data to files. This potentially leads to injection of arbitrary code on the server.

Object Injection

Object Injection enables an attacker to inject an object into PHP code, and can lead to arbitrary code execution, file exposure, or file manipulation attacks.

Code Injection

Code Injection enables an attacker to execute arbitrary code on the server.

Response Splitting

Response Splitting can be used to send arbitrary responses.

File Inclusion

File Inclusion enables an attacker to inject custom files into PHP's file loading mechanism, either explicitly passed to include, or for example via PHP's auto-loading mechanism.

Command Injection

Command Injection enables an attacker to inject a shell command that is execute with the privileges of the web-server. This can be used to expose sensitive data, or gain access of your server.

SQL Injection

SQL Injection enables an attacker to execute arbitrary SQL code on your database server gaining access to user data, or manipulating user data.

XPath Injection

XPath Injection enables an attacker to modify the parts of XML document that are read. If that XML document is for example used for authentication, this can lead to further vulnerabilities similar to SQL Injection.

LDAP Injection

LDAP Injection enables an attacker to inject LDAP statements potentially granting permission to run unauthorized queries, or modify content inside the LDAP tree.

Header Injection

Other Vulnerability

This category comprises other attack vectors such as manipulating the PHP runtime, loading custom extensions, freezing the runtime, or similar.

Regex Injection

Regex Injection enables an attacker to execute arbitrary code in your PHP process.

XML Injection

XML Injection enables an attacker to read files on your local filesystem including configuration files, or can be abused to freeze your web-server process.

Variable Injection

Variable Injection enables an attacker to overwrite program variables with custom data, and can lead to further vulnerabilities.

Unfortunately, the security analysis is currently not available for your project. If you are a non-commercial open-source project, please contact support to gain access.

src/wp-includes/update.php (14 issues)

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<?php
/**
 * A simple set of functions to check our version 1.0 update service.
 *
 * @package WordPress
 * @since 2.3.0
 */

/**
 * Check WordPress version against the newest version.
 *
 * The WordPress version, PHP version, and Locale is sent. Checks against the
 * WordPress server at api.wordpress.org server. Will only check if WordPress
 * isn't installing.
 *
 * @since 2.3.0
 * @global string $wp_version Used to check against the newest WordPress version.
 * @global wpdb   $wpdb
 * @global string $wp_local_package
 *
 * @param array $extra_stats Extra statistics to report to the WordPress.org API.
 * @param bool  $force_check Whether to bypass the transient cache and force a fresh update check. Defaults to false, true if $extra_stats is set.
 */
function wp_version_check( $extra_stats = array(), $force_check = false ) {
	if ( wp_installing() ) {
		return;
	}

	global $wpdb, $wp_local_package;
	// include an unmodified $wp_version
	include( ABSPATH . WPINC . '/version.php' );
	$php_version = phpversion();

	$current = get_site_transient( 'update_core' );
	$translations = wp_get_installed_translations( 'core' );

	// Invalidate the transient when $wp_version changes
	if ( is_object( $current ) && $wp_version != $current->version_checked )

		$current = false;

	if ( ! is_object($current) ) {
		$current = new stdClass;
		$current->updates = array();
		$current->version_checked = $wp_version;
	}

	if ( ! empty( $extra_stats ) )
		$force_check = true;

	// Wait 60 seconds between multiple version check requests
	$timeout = 60;
	$time_not_changed = isset( $current->last_checked ) && $timeout > ( time() - $current->last_checked );
	if ( ! $force_check && $time_not_changed ) {
		return;
	}

	/**
	 * Filters the locale requested for WordPress core translations.
	 *
	 * @since 2.8.0
	 *
	 * @param string $locale Current locale.
	 */
	$locale = apply_filters( 'core_version_check_locale', get_locale() );

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

	if ( method_exists( $wpdb, 'db_version' ) )
		$mysql_version = preg_replace('/[^0-9.].*/', '', $wpdb->db_version());
	else
		$mysql_version = 'N/A';

	if ( is_multisite() ) {
		$user_count = get_user_count();
		$num_blogs = get_blog_count();
		$wp_install = network_site_url();
		$multisite_enabled = 1;
	} else {
		$user_count = count_users();
		$user_count = $user_count['total_users'];
		$multisite_enabled = 0;
		$num_blogs = 1;
		$wp_install = home_url( '/' );
	}

	$query = array(
		'version'            => $wp_version,
		'php'                => $php_version,
		'locale'             => $locale,
		'mysql'              => $mysql_version,
		'local_package'      => isset( $wp_local_package ) ? $wp_local_package : '',
		'blogs'              => $num_blogs,
		'users'              => $user_count,
		'multisite_enabled'  => $multisite_enabled,
		'initial_db_version' => get_site_option( 'initial_db_version' ),
	);

	$post_body = array(
		'translations' => wp_json_encode( $translations ),
	);

	if ( is_array( $extra_stats ) )
		$post_body = array_merge( $post_body, $extra_stats );

	$url = $http_url = 'http://api.wordpress.org/core/version-check/1.7/?' . http_build_query( $query, null, '&' );
	if ( $ssl = wp_http_supports( array( 'ssl' ) ) )
		$url = set_url_scheme( $url, 'https' );

	$doing_cron = wp_doing_cron();

	$options = array(
		'timeout' => $doing_cron ? 30 : 3,
		'user-agent' => 'WordPress/' . $wp_version . '; ' . home_url( '/' ),
		'headers' => array(
			'wp_install' => $wp_install,
			'wp_blog' => home_url( '/' )
		),
		'body' => $post_body,
	);

	$response = wp_remote_post( $url, $options );
	if ( $ssl && is_wp_error( $response ) ) {
		trigger_error(
			sprintf(
				/* translators: %s: support forums URL */
				__( 'An unexpected error occurred. Something may be wrong with WordPress.org or this server&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
				__( 'https://wordpress.org/support/' )
			) . ' ' . __( '(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
		);
		$response = wp_remote_post( $http_url, $options );
	}

	if ( is_wp_error( $response ) || 200 != wp_remote_retrieve_response_code( $response ) ) {
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
		return;
	}

	$body = trim( wp_remote_retrieve_body( $response ) );
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
	$body = json_decode( $body, true );

	if ( ! is_array( $body ) || ! isset( $body['offers'] ) ) {
		return;
	}

	$offers = $body['offers'];

	foreach ( $offers as &$offer ) {
		foreach ( $offer as $offer_key => $value ) {
			if ( 'packages' == $offer_key )
				$offer['packages'] = (object) array_intersect_key( array_map( 'esc_url', $offer['packages'] ),
					array_fill_keys( array( 'full', 'no_content', 'new_bundled', 'partial', 'rollback' ), '' ) );
			elseif ( 'download' == $offer_key )
				$offer['download'] = esc_url( $value );
			else
				$offer[ $offer_key ] = esc_html( $value );
		}
		$offer = (object) array_intersect_key( $offer, array_fill_keys( array( 'response', 'download', 'locale',
			'packages', 'current', 'version', 'php_version', 'mysql_version', 'new_bundled', 'partial_version', 'notify_email', 'support_email', 'new_files' ), '' ) );
	}

	$updates = new stdClass();
	$updates->updates = $offers;
	$updates->last_checked = time();
	$updates->version_checked = $wp_version;

	if ( isset( $body['translations'] ) )
		$updates->translations = $body['translations'];

	set_site_transient( 'update_core', $updates );

	if ( ! empty( $body['ttl'] ) ) {
		$ttl = (int) $body['ttl'];
		if ( $ttl && ( time() + $ttl < wp_next_scheduled( 'wp_version_check' ) ) ) {
			// Queue an event to re-run the update check in $ttl seconds.
			wp_schedule_single_event( time() + $ttl, 'wp_version_check' );
		}
	}

	// Trigger background updates if running non-interactively, and we weren't called from the update handler.
	if ( $doing_cron && ! doing_action( 'wp_maybe_auto_update' ) ) {
		do_action( 'wp_maybe_auto_update' );
	}
}

/**
 * Check plugin versions against the latest versions hosted on WordPress.org.
 *
 * The WordPress version, PHP version, and Locale is sent along with a list of
 * all plugins installed. Checks against the WordPress server at
 * api.wordpress.org. Will only check if WordPress isn't installing.
 *
 * @since 2.3.0
 * @global string $wp_version Used to notify the WordPress version.
 *
 * @param array $extra_stats Extra statistics to report to the WordPress.org API.
 */
function wp_update_plugins( $extra_stats = array() ) {
	if ( wp_installing() ) {
		return;
	}

	// include an unmodified $wp_version
	include( 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;

	$new_option = new stdClass;
	$new_option->last_checked = time();

	$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 = 0;
			} 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 ) {
			$new_option->checked[ $file ] = $p['Version'];

			if ( !isset( $current->checked[ $file ] ) || strval($current->checked[ $file ]) !== strval($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 array $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;
	} 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 . '; ' . get_bloginfo( 'url' )

	);

	if ( $extra_stats ) {

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

	$url = $http_url = 'http://api.wordpress.org/plugins/update-check/1.1/';
	if ( $ssl = wp_http_supports( array( '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&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
				__( 'https://wordpress.org/support/' )
			) . ' ' . __( '(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( $raw_response ) ) {
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
		return;
	}

	$response = json_decode( wp_remote_retrieve_body( $raw_response ), true );
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
	foreach ( $response['plugins'] as &$plugin ) {
		$plugin = (object) $plugin;
		if ( isset( $plugin->compatibility ) ) {
			$plugin->compatibility = (object) $plugin->compatibility;
			foreach ( $plugin->compatibility as &$data ) {
				$data = (object) $data;
			}
		}
	}
	unset( $plugin, $data );
	foreach ( $response['no_update'] as &$plugin ) {
		$plugin = (object) $plugin;
	}
	unset( $plugin );

	if ( is_array( $response ) ) {
		$new_option->response = $response['plugins'];
		$new_option->translations = $response['translations'];
		// TODO: Perhaps better to store no_update in a separate transient with an expiry?
		$new_option->no_update = $response['no_update'];
	} else {
		$new_option->response = array();
		$new_option->translations = array();
		$new_option->no_update = array();
	}

	set_site_transient( 'update_plugins', $new_option );
}

/**
 * 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.
 *
 * @since 2.7.0
 *
 * @param array $extra_stats Extra statistics to report to the WordPress.org API.
 */
function wp_update_themes( $extra_stats = array() ) {
	if ( wp_installing() ) {
		return;
	}

	// include an unmodified $wp_version
	include( ABSPATH . WPINC . '/version.php' );

	$installed_themes = wp_get_themes();
	$translations = wp_get_installed_translations( 'themes' );

	$last_update = get_site_transient( 'update_themes' );
	if ( ! is_object($last_update) )
		$last_update = new stdClass;

	$themes = $checked = $request = array();

	// Put slug of current theme into request.
	$request['active'] = get_option( 'stylesheet' );

	foreach ( $installed_themes as $theme ) {
		$checked[ $theme->get_stylesheet() ] = $theme->get('Version');

		$themes[ $theme->get_stylesheet() ] = array(
			'Name'       => $theme->get('Name'),
			'Title'      => $theme->get('Name'),
			'Version'    => $theme->get('Version'),
			'Author'     => $theme->get('Author'),
			'Author URI' => $theme->get('AuthorURI'),
			'Template'   => $theme->get_template(),
			'Stylesheet' => $theme->get_stylesheet(),
		);
	}

	$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-themes.php' :
		case 'load-update.php' :
			$timeout = HOUR_IN_SECONDS;
			break;
		default :
			$timeout = $doing_cron ? 0 : 12 * HOUR_IN_SECONDS;
	}

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

	if ( $time_not_changed && ! $extra_stats ) {

		$theme_changed = false;
		foreach ( $checked as $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;
				}
			}
		}

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

	// 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 );

	$request['themes'] = $themes;

	$locales = array_values( get_available_languages() );

	/**
	 * Filters the locales requested for theme translations.
	 *
	 * @since 3.7.0
	 * @since 4.5.0 The default value of the `$locales` parameter changed to include all locales.
	 *
	 * @param array $locales Theme locales. Default is all available locales of the site.
	 */
	$locales = apply_filters( 'themes_update_check_locales', $locales );
	$locales = array_unique( $locales );

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

	$options = array(
		'timeout' => $timeout,
		'body' => array(
			'themes'       => wp_json_encode( $request ),
			'translations' => wp_json_encode( $translations ),
			'locale'       => wp_json_encode( $locales ),
		),
		'user-agent'	=> 'WordPress/' . $wp_version . '; ' . get_bloginfo( 'url' )

	);

	if ( $extra_stats ) {

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

	$url = $http_url = 'http://api.wordpress.org/themes/update-check/1.1/';
	if ( $ssl = wp_http_supports( array( '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&#8217;s configuration. If you continue to have problems, please try the <a href="%s">support forums</a>.' ),
				__( 'https://wordpress.org/support/' )
			) . ' ' . __( '(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( $raw_response ) ) {
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}
		return;
	}

	$new_update = new stdClass;
	$new_update->last_checked = time();
	$new_update->checked = $checked;

	$response = json_decode( wp_remote_retrieve_body( $raw_response ), true );
/**
 * @return array|string
 */
function returnsDifferentValues($x) {
    if ($x) {
        return 'foo';
    }

    return array();
}

$x = returnsDifferentValues($y);
if (is_array($x)) {
    // $x is an array.
}

	if ( is_array( $response ) ) {
		$new_update->response     = $response['themes'];
		$new_update->translations = $response['translations'];
	}

	set_site_transient( 'update_themes', $new_update );
}

/**
 * Performs WordPress automatic background updates.
 *
 * @since 3.7.0
 */
function wp_maybe_auto_update() {
	include_once( ABSPATH . '/wp-admin/includes/admin.php' );
	include_once( ABSPATH . '/wp-admin/includes/class-wp-upgrader.php' );

	$upgrader = new WP_Automatic_Updater;
	$upgrader->run();
}

/**
 * Retrieves a list of all language updates available.
 *
 * @since 3.7.0
 *
 * @return array
 */
function wp_get_translation_updates() {
	$updates = array();
	$transients = array( 'update_core' => 'core', 'update_plugins' => 'plugin', 'update_themes' => 'theme' );
	foreach ( $transients as $transient => $type ) {
		$transient = get_site_transient( $transient );
		if ( empty( $transient->translations ) )
			continue;

		foreach ( $transient->translations as $translation ) {
			$updates[] = (object) $translation;
		}
	}
	return $updates;
}

/**
 * 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, '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 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 );
}

/**
 * Determines whether core should be updated.
 *
 * @since 2.8.0
 *
 * @global string $wp_version
 */
function _maybe_update_core() {
	// include an unmodified $wp_version
	include( ABSPATH . WPINC . '/version.php' );

	$current = get_site_transient( 'update_core' );

	if ( isset( $current->last_checked, $current->version_checked ) &&
		12 * HOUR_IN_SECONDS > ( time() - $current->last_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
 */
function _maybe_update_plugins() {
	$current = get_site_transient( 'update_plugins' );
	if ( isset( $current->last_checked ) && 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked ) )
		return;
	wp_update_plugins();
}

/**
 * Check themes versions only after a duration of time.
 *
 * This is for performance reasons to make sure that on the theme version
 * checker is not run on every page load.
 *
 * @since 2.7.0
 * @access private
 */
function _maybe_update_themes() {
	$current = get_site_transient( 'update_themes' );
	if ( isset( $current->last_checked ) && 12 * HOUR_IN_SECONDS > ( time() - $current->last_checked ) )
		return;
	wp_update_themes();
}

/**
 * Schedule core, theme, and plugin update checks.
 *
 * @since 3.1.0
 */
function wp_schedule_update_checks() {
	if ( ! wp_next_scheduled( 'wp_version_check' ) && ! wp_installing() )
		wp_schedule_event(time(), 'twicedaily', 'wp_version_check');

	if ( ! wp_next_scheduled( 'wp_update_plugins' ) && ! wp_installing() )
		wp_schedule_event(time(), 'twicedaily', 'wp_update_plugins');

	if ( ! wp_next_scheduled( 'wp_update_themes' ) && ! wp_installing() )
		wp_schedule_event(time(), 'twicedaily', 'wp_update_themes');
}

/**
 * Clear existing update caches for plugins, themes, and core.
 *
 * @since 4.1.0
 */
function wp_clean_update_cache() {
	if ( function_exists( 'wp_clean_plugins_cache' ) ) {
		wp_clean_plugins_cache();
	} else {
		delete_site_transient( 'update_plugins' );
	}
	wp_clean_themes_cache();
	delete_site_transient( 'update_core' );
}

if ( ( ! is_main_site() && ! is_network_admin() ) || wp_doing_ajax() ) {
	return;
}

add_action( 'admin_init', '_maybe_update_core' );
add_action( 'wp_version_check', 'wp_version_check' );

add_action( 'load-plugins.php', 'wp_update_plugins' );
add_action( 'load-update.php', 'wp_update_plugins' );
add_action( 'load-update-core.php', 'wp_update_plugins' );
add_action( 'admin_init', '_maybe_update_plugins' );
add_action( 'wp_update_plugins', 'wp_update_plugins' );

add_action( 'load-themes.php', 'wp_update_themes' );
add_action( 'load-update.php', 'wp_update_themes' );
add_action( 'load-update-core.php', 'wp_update_themes' );
add_action( 'admin_init', '_maybe_update_themes' );
add_action( 'wp_update_themes', 'wp_update_themes' );

add_action( 'update_option_WPLANG', 'wp_clean_update_cache' , 10, 0 );

add_action( 'wp_maybe_auto_update', 'wp_maybe_auto_update' );

add_action( 'init', 'wp_schedule_update_checks' );


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