检查最新版本的WordPress版本。
原型
wp_version_check( array $extra_stats = array(), bool $force_check = false )
描述
发送WordPress版本，PHP版本和区域设置。检查api.wordpress.org服务器上的WordPress服务器。只检查WordPress是否未安装。
参数
$extra_stats (array) (Optional) 要报告给WordPress.org API的额外统计信息。
$force_check (bool) (Optional) 是否绕过瞬态缓存并强制进行新的更新检查。默认为false，如果设置了$ extra_stats，则为true。
源文件
路径：wp-includes/update.php
<?php
...
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' ),
);
/**
* Filter the query arguments sent as part of the core version check.
*
* WARNING: Changing this data may result in your site not receiving security updates.
* Please exercise extreme caution.
*
* @since 4.9.0
*
* @param array $query {
* Version check query arguments.
*
* @type string $version WordPress version number.
* @type string $php PHP version number.
* @type string $locale The locale to retrieve updates for.
* @type string $mysql MySQL version number.
* @type string $local_package The value of the $wp_local_package global, when set.
* @type int $blogs Number of sites on this WordPress installation.
* @type int $users Number of users on this WordPress installation.
* @type int $multisite_enabled Whether this WordPress installation uses Multisite.
* @type int $initial_db_version Database version of WordPress at time of installation.
* }
*/
$query = apply_filters( 'core_version_check_query_args', $query );
$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’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;
}
$body = trim( wp_remote_retrieve_body( $response ) );
$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' );
}
}
...
?>其他
英文文档：https://developer.wordpress.org/reference/functions/wp_version_check/