www.gusucode.com > wordpress PHP博客系统英文版 v4.5.1PHP源码程序 > wordpress PHP博客系统英文版 v4.5.1/wordpress/wordpress/wp-includes/class-wp-network.php
<?php
/**
* Network API: WP_Network class
*
* @package WordPress
* @subpackage Multisite
* @since 4.4.0
*/
/**
* Core class used for interacting with a multisite network.
*
* This class is used during load to populate the `$current_site` global and
* setup the current network.
*
* This class is most useful in WordPress multi-network installations where the
* ability to interact with any network of sites is required.
*
* @since 4.4.0
*/
class WP_Network {
/**
* Network ID.
*
* A numeric string, for compatibility reasons.
*
* @since 4.4.0
* @access public
* @var string
*/
public $id;
/**
* Domain of the network.
*
* @since 4.4.0
* @access public
* @var string
*/
public $domain = '';
/**
* Path of the network.
*
* @since 4.4.0
* @access public
* @var string
*/
public $path = '';
/**
* The ID of the network's main site.
*
* Named "blog" vs. "site" for legacy reasons. A main site is mapped to
* the network when the network is created.
*
* A numeric string, for compatibility reasons.
*
* @since 4.4.0
* @access public
* @var string
*/
public $blog_id = 0;
/**
* Domain used to set cookies for this network.
*
* @since 4.4.0
* @access public
* @var string
*/
public $cookie_domain = '';
/**
* Name of this network.
*
* Named "site" vs. "network" for legacy reasons.
*
* @since 4.4.0
* @access public
* @var string
*/
public $site_name = '';
/**
* Retrieve a network from the database by its ID.
*
* @since 4.4.0
* @access public
*
* @global wpdb $wpdb WordPress database abstraction object.
*
* @param int $network_id The ID of the network to retrieve.
* @return WP_Network|bool The network's object if found. False if not.
*/
public static function get_instance( $network_id ) {
global $wpdb;
$network_id = (int) $network_id;
if ( ! $network_id ) {
return false;
}
$_network = wp_cache_get( $network_id, 'networks' );
if ( ! $_network ) {
$_network = $wpdb->get_row( $wpdb->prepare( "SELECT * FROM {$wpdb->site} WHERE id = %d LIMIT 1", $network_id ) );
if ( empty( $_network ) || is_wp_error( $_network ) ) {
return false;
}
wp_cache_add( $network_id, $_network, 'networks' );
}
return new WP_Network( $_network );
}
/**
* Create a new WP_Network object.
*
* Will populate object properties from the object provided and assign other
* default properties based on that information.
*
* @since 4.4.0
* @access public
*
* @param WP_Network|object $network A network object.
*/
public function __construct( $network ) {
foreach( get_object_vars( $network ) as $key => $value ) {
$this->$key = $value;
}
$this->_set_site_name();
$this->_set_cookie_domain();
}
/**
* Set the site name assigned to the network if one has not been populated.
*
* @since 4.4.0
* @access private
*/
private function _set_site_name() {
if ( ! empty( $this->site_name ) ) {
return;
}
$default = ucfirst( $this->domain );
$this->site_name = get_network_option( $this->id, 'site_name', $default );
}
/**
* Set the cookie domain based on the network domain if one has
* not been populated.
*
* @todo What if the domain of the network doesn't match the current site?
*
* @since 4.4.0
* @access private
*/
private function _set_cookie_domain() {
if ( ! empty( $this->cookie_domain ) ) {
return;
}
$this->cookie_domain = $this->domain;
if ( 'www.' === substr( $this->cookie_domain, 0, 4 ) ) {
$this->cookie_domain = substr( $this->cookie_domain, 4 );
}
}
/**
* Retrieve the closest matching network for a domain and path.
*
* This will not necessarily return an exact match for a domain and path. Instead, it
* breaks the domain and path into pieces that are then used to match the closest
* possibility from a query.
*
* The intent of this method is to match a network during bootstrap for a
* requested site address.
*
* @since 4.4.0
* @access public
* @static
*
* @param string $domain Domain to check.
* @param string $path Path to check.
* @param int|null $segments Path segments to use. Defaults to null, or the full path.
* @return WP_Network|bool Network object if successful. False when no network is found.
*/
public static function get_by_path( $domain = '', $path = '', $segments = null ) {
global $wpdb;
$domains = array( $domain );
$pieces = explode( '.', $domain );
/*
* It's possible one domain to search is 'com', but it might as well
* be 'localhost' or some other locally mapped domain.
*/
while ( array_shift( $pieces ) ) {
if ( ! empty( $pieces ) ) {
$domains[] = implode( '.', $pieces );
}
}
/*
* If we've gotten to this function during normal execution, there is
* more than one network installed. At this point, who knows how many
* we have. Attempt to optimize for the situation where networks are
* only domains, thus meaning paths never need to be considered.
*
* This is a very basic optimization; anything further could have
* drawbacks depending on the setup, so this is best done per-install.
*/
$using_paths = true;
if ( wp_using_ext_object_cache() ) {
$using_paths = wp_cache_get( 'networks_have_paths', 'site-options' );
if ( false === $using_paths ) {
$using_paths = (int) $wpdb->get_var( "SELECT id FROM {$wpdb->site} WHERE path <> '/' LIMIT 1" );
wp_cache_add( 'networks_have_paths', $using_paths, 'site-options' );
}
}
$paths = array();
if ( $using_paths ) {
$path_segments = array_filter( explode( '/', trim( $path, '/' ) ) );
/**
* Filter the number of path segments to consider when searching for a site.
*
* @since 3.9.0
*
* @param int|null $segments The number of path segments to consider. WordPress by default looks at
* one path segment. The function default of null only makes sense when you
* know the requested path should match a network.
* @param string $domain The requested domain.
* @param string $path The requested path, in full.
*/
$segments = apply_filters( 'network_by_path_segments_count', $segments, $domain, $path );
if ( ( null !== $segments ) && count( $path_segments ) > $segments ) {
$path_segments = array_slice( $path_segments, 0, $segments );
}
while ( count( $path_segments ) ) {
$paths[] = '/' . implode( '/', $path_segments ) . '/';
array_pop( $path_segments );
}
$paths[] = '/';
}
/**
* Determine a network by its domain and path.
*
* This allows one to short-circuit the default logic, perhaps by
* replacing it with a routine that is more optimal for your setup.
*
* Return null to avoid the short-circuit. Return false if no network
* can be found at the requested domain and path. Otherwise, return
* an object from wp_get_network().
*
* @since 3.9.0
*
* @param null|bool|object $network Network value to return by path.
* @param string $domain The requested domain.
* @param string $path The requested path, in full.
* @param int|null $segments The suggested number of paths to consult.
* Default null, meaning the entire path was to be consulted.
* @param array $paths The paths to search for, based on $path and $segments.
*/
$pre = apply_filters( 'pre_get_network_by_path', null, $domain, $path, $segments, $paths );
if ( null !== $pre ) {
return $pre;
}
// @todo Consider additional optimization routes, perhaps as an opt-in for plugins.
// We already have paths covered. What about how far domains should be drilled down (including www)?
$search_domains = "'" . implode( "', '", $wpdb->_escape( $domains ) ) . "'";
if ( ! $using_paths ) {
$network = $wpdb->get_row( "
SELECT * FROM {$wpdb->site}
WHERE domain IN ({$search_domains})
ORDER BY CHAR_LENGTH(domain)
DESC LIMIT 1
" );
if ( ! empty( $network ) && ! is_wp_error( $network ) ) {
return new WP_Network( $network );
}
return false;
} else {
$search_paths = "'" . implode( "', '", $wpdb->_escape( $paths ) ) . "'";
$networks = $wpdb->get_results( "
SELECT * FROM {$wpdb->site}
WHERE domain IN ({$search_domains})
AND path IN ({$search_paths})
ORDER BY CHAR_LENGTH(domain) DESC, CHAR_LENGTH(path) DESC
" );
}
/*
* Domains are sorted by length of domain, then by length of path.
* The domain must match for the path to be considered. Otherwise,
* a network with the path of / will suffice.
*/
$found = false;
foreach ( $networks as $network ) {
if ( ( $network->domain === $domain ) || ( "www.{$network->domain}" === $domain ) ) {
if ( in_array( $network->path, $paths, true ) ) {
$found = true;
break;
}
}
if ( $network->path === '/' ) {
$found = true;
break;
}
}
if ( true === $found ) {
return new WP_Network( $network );
}
return false;
}
}