WordPress Version: 4.6
/**
* Identifies the network and site of a requested domain and path and populates the
* corresponding network and site global objects as part of the multisite bootstrap process.
*
* Prior to 4.6.0, this was a procedural block in `ms-settings.php`. It was wrapped into
* a function to facilitate unit tests. It should not be used outside of core.
*
* Usually, it's easier to query the site first, which then declares its network.
* In limited situations, we either can or must find the network first.
*
* If a network and site are found, a `true` response will be returned so that the
* request can continue.
*
* If neither a network or site is found, `false` or a URL string will be returned
* so that either an error can be shown or a redirect can occur.
*
* @since 4.6.0
* @access private
*
* @global wpdb $wpdb WordPress database abstraction object.
* @global WP_Network $current_site The current network.
* @global WP_Site $current_blog The current site.
*
* @param string $domain The requested domain.
* @param string $path The requested path.
* @param bool $subdomain Optional. Whether a subdomain (true) or subdirectory (false) configuration.
* Default false.
* @return bool|string True if bootstrap successfully populated `$current_blog` and `$current_site`.
* False if bootstrap could not be properly completed.
* Redirect URL if parts exist, but the request as a whole can not be fulfilled.
*/
function ms_load_current_site_and_network($domain, $path, $subdomain = false)
{
global $wpdb, $current_site, $current_blog;
// If the network is defined in wp-config.php, we can simply use that.
if (defined('DOMAIN_CURRENT_SITE') && defined('PATH_CURRENT_SITE')) {
$current_site = new stdClass();
$current_site->id = defined('SITE_ID_CURRENT_SITE') ? SITE_ID_CURRENT_SITE : 1;
$current_site->domain = DOMAIN_CURRENT_SITE;
$current_site->path = PATH_CURRENT_SITE;
if (defined('BLOG_ID_CURRENT_SITE')) {
$current_site->blog_id = BLOG_ID_CURRENT_SITE;
} elseif (defined('BLOGID_CURRENT_SITE')) {
// deprecated.
$current_site->blog_id = BLOGID_CURRENT_SITE;
}
if (0 === strcasecmp($current_site->domain, $domain) && 0 === strcasecmp($current_site->path, $path)) {
$current_blog = get_site_by_path($domain, $path);
} elseif ('/' !== $current_site->path && 0 === strcasecmp($current_site->domain, $domain) && 0 === stripos($path, $current_site->path)) {
// If the current network has a path and also matches the domain and path of the request,
// we need to look for a site using the first path segment following the network's path.
$current_blog = get_site_by_path($domain, $path, 1 + count(explode('/', trim($current_site->path, '/'))));
} else {
// Otherwise, use the first path segment (as usual).
$current_blog = get_site_by_path($domain, $path, 1);
}
} elseif (!$subdomain) {
/*
* A "subdomain" install can be re-interpreted to mean "can support any domain".
* If we're not dealing with one of these installs, then the important part is determining
* the network first, because we need the network's path to identify any sites.
*/
if (!$current_site = wp_cache_get('current_network', 'site-options')) {
// Are there even two networks installed?
$one_network = $wpdb->get_row("SELECT * FROM {$wpdb->site} LIMIT 2");
// [sic]
if (1 === $wpdb->num_rows) {
$current_site = new WP_Network($one_network);
wp_cache_add('current_network', $current_site, 'site-options');
} elseif (0 === $wpdb->num_rows) {
// A network not found hook should fire here.
return false;
}
}
if (empty($current_site)) {
$current_site = WP_Network::get_by_path($domain, $path, 1);
}
if (empty($current_site)) {
/**
* Fires when a network cannot be found based on the requested domain and path.
*
* At the time of this action, the only recourse is to redirect somewhere
* and exit. If you want to declare a particular network, do so earlier.
*
* @since 4.4.0
*
* @param string $domain The domain used to search for a network.
* @param string $path The path used to search for a path.
*/
do_action('ms_network_not_found', $domain, $path);
return false;
} elseif ($path === $current_site->path) {
$current_blog = get_site_by_path($domain, $path);
} else {
// Search the network path + one more path segment (on top of the network path).
$current_blog = get_site_by_path($domain, $path, substr_count($current_site->path, '/'));
}
} else {
// Find the site by the domain and at most the first path segment.
$current_blog = get_site_by_path($domain, $path, 1);
if ($current_blog) {
$current_site = WP_Network::get_instance($current_blog->site_id ? $current_blog->site_id : 1);
} else {
// If you don't have a site with the same domain/path as a network, you're pretty screwed, but:
$current_site = WP_Network::get_by_path($domain, $path, 1);
}
}
// The network declared by the site trumps any constants.
if ($current_blog && $current_blog->site_id != $current_site->id) {
$current_site = WP_Network::get_instance($current_blog->site_id);
}
// No network has been found, bail.
if (empty($current_site)) {
/** This action is documented in wp-includes/ms-settings.php */
do_action('ms_network_not_found', $domain, $path);
return false;
}
// During activation of a new subdomain, the requested site does not yet exist.
if (empty($current_blog) && wp_installing()) {
$current_blog = new stdClass();
$current_blog->blog_id = $blog_id = 1;
$current_blog->public = 1;
}
// No site has been found, bail.
if (empty($current_blog)) {
// We're going to redirect to the network URL, with some possible modifications.
$scheme = is_ssl() ? 'https' : 'http';
$destination = "{$scheme}://{$current_site->domain}{$current_site->path}";
/**
* Fires when a network can be determined but a site cannot.
*
* At the time of this action, the only recourse is to redirect somewhere
* and exit. If you want to declare a particular site, do so earlier.
*
* @since 3.9.0
*
* @param object $current_site The network that had been determined.
* @param string $domain The domain used to search for a site.
* @param string $path The path used to search for a site.
*/
do_action('ms_site_not_found', $current_site, $domain, $path);
if ($subdomain && !defined('NOBLOGREDIRECT')) {
// For a "subdomain" install, redirect to the signup form specifically.
$destination .= 'wp-signup.php?new=' . str_replace('.' . $current_site->domain, '', $domain);
} elseif ($subdomain) {
// For a "subdomain" install, the NOBLOGREDIRECT constant
// can be used to avoid a redirect to the signup form.
// Using the ms_site_not_found action is preferred to the constant.
if ('%siteurl%' !== NOBLOGREDIRECT) {
$destination = NOBLOGREDIRECT;
}
} elseif (0 === strcasecmp($current_site->domain, $domain)) {
/*
* If the domain we were searching for matches the network's domain,
* it's no use redirecting back to ourselves -- it'll cause a loop.
* As we couldn't find a site, we're simply not installed.
*/
return false;
}
return $destination;
}
// Figure out the current network's main site.
if (empty($current_site->blog_id)) {
if ($current_blog->domain === $current_site->domain && $current_blog->path === $current_site->path) {
$current_site->blog_id = $current_blog->blog_id;
} elseif (!$current_site->blog_id = wp_cache_get('network:' . $current_site->id . ':main_site', 'site-options')) {
$current_site->blog_id = $wpdb->get_var($wpdb->prepare("SELECT blog_id FROM {$wpdb->blogs} WHERE domain = %s AND path = %s", $current_site->domain, $current_site->path));
wp_cache_add('network:' . $current_site->id . ':main_site', $current_site->blog_id, 'site-options');
}
}
return true;
}