<h3>Düzenle: ms-load.php</h3>
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/**
 * These functions are needed to load Multisite.
 *
 * @since 3.0.0
 *
 * @package WordPress
 * @subpackage Multisite
 */

/**
 * Whether a subdomain configuration is enabled.
 *
 * @since 3.0.0
 *
 * @return bool True if subdomain configuration is enabled, false otherwise.
 */
function is_subdomain_install() {
	if ( defined( &#039;SUBDOMAIN_INSTALL&#039; ) ) {
		return SUBDOMAIN_INSTALL;
	}

	return ( defined( &#039;VHOST&#039; ) &amp;&amp; &#039;yes&#039; === VHOST );
}

/**
 * Returns array of network plugin files to be included in global scope.
 *
 * The default directory is wp-content/plugins. To change the default directory
 * manually, define `WP_PLUGIN_DIR` and `WP_PLUGIN_URL` in `wp-config.php`.
 *
 * @access private
 * @since 3.1.0
 *
 * @return string[] Array of absolute paths to files to include.
 */
function wp_get_active_network_plugins() {
	$active_plugins = (array) get_site_option( &#039;active_sitewide_plugins&#039;, array() );
	if ( empty( $active_plugins ) ) {
		return array();
	}

	$plugins        = array();
	$active_plugins = array_keys( $active_plugins );
	sort( $active_plugins );

	foreach ( $active_plugins as $plugin ) {
		if ( ! validate_file( $plugin )                     // $plugin must validate as file.
			&amp;&amp; str_ends_with( $plugin, &#039;.php&#039; )             // $plugin must end with &#039;.php&#039;.
			&amp;&amp; file_exists( WP_PLUGIN_DIR . &#039;/&#039; . $plugin ) // $plugin must exist.
			) {
			$plugins[] = WP_PLUGIN_DIR . &#039;/&#039; . $plugin;
		}
	}

	return $plugins;
}

/**
 * Checks status of current blog.
 *
 * Checks if the blog is deleted, inactive, archived, or spammed.
 *
 * Dies with a default message if the blog does not pass the check.
 *
 * To change the default message when a blog does not pass the check,
 * use the wp-content/blog-deleted.php, blog-inactive.php and
 * blog-suspended.php drop-ins.
 *
 * @since 3.0.0
 *
 * @return true|string Returns true on success, or drop-in file to include.
 */
function ms_site_check() {

	/**
	 * Filters checking the status of the current blog.
	 *
	 * @since 3.0.0
	 *
	 * @param bool|null $check Whether to skip the blog status check. Default null.
	 */
	$check = apply_filters( &#039;ms_site_check&#039;, null );
	if ( null !== $check ) {
		return true;
	}

	// Allow super admins to see blocked sites.
	if ( is_super_admin() ) {
		return true;
	}

	$blog = get_site();

	if ( &#039;1&#039; === $blog-&gt;deleted ) {
		if ( file_exists( WP_CONTENT_DIR . &#039;/blog-deleted.php&#039; ) ) {
			return WP_CONTENT_DIR . &#039;/blog-deleted.php&#039;;
		} else {
			wp_die( __( &#039;This site is no longer available.&#039; ), &#039;&#039;, array( &#039;response&#039; =&gt; 410 ) );
		}
	}

	if ( &#039;2&#039; === $blog-&gt;deleted ) {
		if ( file_exists( WP_CONTENT_DIR . &#039;/blog-inactive.php&#039; ) ) {
			return WP_CONTENT_DIR . &#039;/blog-inactive.php&#039;;
		} else {
			$admin_email = str_replace( &#039;@&#039;, &#039; AT &#039;, get_site_option( &#039;admin_email&#039;, &#039;support@&#039; . get_network()-&gt;domain ) );
			wp_die(
				sprintf(
					/* translators: %s: Admin email link. */
					__( &#039;This site has not been activated yet. If you are having problems activating your site, please contact %s.&#039; ),
					sprintf( &#039;&lt;a href=&quot;mailto:%1$s&quot;&gt;%1$s&lt;/a&gt;&#039;, $admin_email )
				)
			);
		}
	}

	if ( &#039;1&#039; === $blog-&gt;archived || &#039;1&#039; === $blog-&gt;spam ) {
		if ( file_exists( WP_CONTENT_DIR . &#039;/blog-suspended.php&#039; ) ) {
			return WP_CONTENT_DIR . &#039;/blog-suspended.php&#039;;
		} else {
			wp_die( __( &#039;This site has been archived or suspended.&#039; ), &#039;&#039;, array( &#039;response&#039; =&gt; 410 ) );
		}
	}

	return true;
}

/**
 * Retrieves the closest matching network for a domain and path.
 *
 * {@internal In 4.4.0, converted to a wrapper for WP_Network::get_by_path()}
 *
 * @since 3.9.0
 *
 * @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|false Network object if successful. False when no network is found.
 */
function get_network_by_path( $domain, $path, $segments = null ) {
	return WP_Network::get_by_path( $domain, $path, $segments );
}

/**
 * Retrieves the closest matching site object by its 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 site object during bootstrap for a
 * requested site address
 *
 * @since 3.9.0
 * @since 4.7.0 Updated to always return a `WP_Site` object.
 *
 * @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_Site|false Site object if successful. False when no site is found.
 */
function get_site_by_path( $domain, $path, $segments = null ) {
	$path_segments = array_filter( explode( &#039;/&#039;, trim( $path, &#039;/&#039; ) ) );

	/**
	 * Filters 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 following the network path. The function default of
	 *                           null only makes sense when you know the requested path should match a site.
	 * @param string   $domain   The requested domain.
	 * @param string   $path     The requested path, in full.
	 */
	$segments = apply_filters( &#039;site_by_path_segments_count&#039;, $segments, $domain, $path );

	if ( null !== $segments &amp;&amp; count( $path_segments ) &gt; $segments ) {
		$path_segments = array_slice( $path_segments, 0, $segments );
	}

	$paths = array();

	while ( count( $path_segments ) ) {
		$paths[] = &#039;/&#039; . implode( &#039;/&#039;, $path_segments ) . &#039;/&#039;;
		array_pop( $path_segments );
	}

	$paths[] = &#039;/&#039;;

	/**
	 * Determines a site 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 site
	 * can be found at the requested domain and path. Otherwise, return
	 * a site object.
	 *
	 * @since 3.9.0
	 *
	 * @param null|false|WP_Site $site     Site value to return by path. Default null
	 *                                     to continue retrieving the site.
	 * @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 string[]           $paths    The paths to search for, based on $path and $segments.
	 */
	$pre = apply_filters( &#039;pre_get_site_by_path&#039;, null, $domain, $path, $segments, $paths );
	if ( null !== $pre ) {
		if ( false !== $pre &amp;&amp; ! $pre instanceof WP_Site ) {
			$pre = new WP_Site( $pre );
		}
		return $pre;
	}

	/*
	 * @todo
	 * Caching, etc. Consider alternative optimization routes,
	 * perhaps as an opt-in for plugins, rather than using the pre_* filter.
	 * For example: The segments filter can expand or ignore paths.
	 * If persistent caching is enabled, we could query the DB for a path &lt;&gt; &#039;/&#039;
	 * then cache whether we can just always ignore paths.
	 */

	/*
	 * Either www or non-www is supported, not both. If a www domain is requested,
	 * query for both to provide the proper redirect.
	 */
	$domains = array( $domain );
	if ( str_starts_with( $domain, &#039;www.&#039; ) ) {
		$domains[] = substr( $domain, 4 );
	}

	$args = array(
		&#039;number&#039;                 =&gt; 1,
		&#039;update_site_meta_cache&#039; =&gt; false,
	);

	if ( count( $domains ) &gt; 1 ) {
		$args[&#039;domain__in&#039;]               = $domains;
		$args[&#039;orderby&#039;][&#039;domain_length&#039;] = &#039;DESC&#039;;
	} else {
		$args[&#039;domain&#039;] = array_shift( $domains );
	}

	if ( count( $paths ) &gt; 1 ) {
		$args[&#039;path__in&#039;]               = $paths;
		$args[&#039;orderby&#039;][&#039;path_length&#039;] = &#039;DESC&#039;;
	} else {
		$args[&#039;path&#039;] = array_shift( $paths );
	}

	$result = get_sites( $args );
	$site   = array_shift( $result );

	if ( $site ) {
		return $site;
	}

	return false;
}

/**
 * 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&#039;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 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 $current_site, $current_blog;

	// If the network is defined in wp-config.php, we can simply use that.
	if ( defined( &#039;DOMAIN_CURRENT_SITE&#039; ) &amp;&amp; defined( &#039;PATH_CURRENT_SITE&#039; ) ) {
		$current_site         = new stdClass();
		$current_site-&gt;id     = defined( &#039;SITE_ID_CURRENT_SITE&#039; ) ? SITE_ID_CURRENT_SITE : 1;
		$current_site-&gt;domain = DOMAIN_CURRENT_SITE;
		$current_site-&gt;path   = PATH_CURRENT_SITE;
		if ( defined( &#039;BLOG_ID_CURRENT_SITE&#039; ) ) {
			$current_site-&gt;blog_id = BLOG_ID_CURRENT_SITE;
		} elseif ( defined( &#039;BLOGID_CURRENT_SITE&#039; ) ) { // Deprecated.
			$current_site-&gt;blog_id = BLOGID_CURRENT_SITE;
		}

		if ( 0 === strcasecmp( $current_site-&gt;domain, $domain ) &amp;&amp; 0 === strcasecmp( $current_site-&gt;path, $path ) ) {
			$current_blog = get_site_by_path( $domain, $path );
		} elseif ( &#039;/&#039; !== $current_site-&gt;path &amp;&amp; 0 === strcasecmp( $current_site-&gt;domain, $domain ) &amp;&amp; 0 === stripos( $path, $current_site-&gt;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&#039;s path.
			 */
			$current_blog = get_site_by_path( $domain, $path, 1 + count( explode( &#039;/&#039;, trim( $current_site-&gt;path, &#039;/&#039; ) ) ) );
		} else {
			// Otherwise, use the first path segment (as usual).
			$current_blog = get_site_by_path( $domain, $path, 1 );
		}
	} elseif ( ! $subdomain ) {
		/*
		 * A &quot;subdomain&quot; installation can be re-interpreted to mean &quot;can support any domain&quot;.
		 * If we&#039;re not dealing with one of these installations, then the important part is determining
		 * the network first, because we need the network&#039;s path to identify any sites.
		 */
		$current_site = wp_cache_get( &#039;current_network&#039;, &#039;site-options&#039; );
		if ( ! $current_site ) {
			// Are there even two networks installed?
			$networks = get_networks( array( &#039;number&#039; =&gt; 2 ) );
			if ( count( $networks ) === 1 ) {
				$current_site = array_shift( $networks );
				wp_cache_add( &#039;current_network&#039;, $current_site, &#039;site-options&#039; );
			} elseif ( empty( $networks ) ) {
				// 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( &#039;ms_network_not_found&#039;, $domain, $path );

			return false;
		} elseif ( $path === $current_site-&gt;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-&gt;path, &#039;/&#039; ) );
		}
	} 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-&gt;site_id ? $current_blog-&gt;site_id : 1 );
		} else {
			// If you don&#039;t have a site with the same domain/path as a network, you&#039;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 &amp;&amp; (int) $current_blog-&gt;site_id !== $current_site-&gt;id ) {
		$current_site = WP_Network::get_instance( $current_blog-&gt;site_id );
	}

	// No network has been found, bail.
	if ( empty( $current_site ) ) {
		/** This action is documented in wp-includes/ms-settings.php */
		do_action( &#039;ms_network_not_found&#039;, $domain, $path );

		return false;
	}

	// During activation of a new subdomain, the requested site does not yet exist.
	if ( empty( $current_blog ) &amp;&amp; wp_installing() ) {
		$current_blog          = new stdClass();
		$current_blog-&gt;blog_id = 1;
		$blog_id               = 1;
		$current_blog-&gt;public  = 1;
	}

	// No site has been found, bail.
	if ( empty( $current_blog ) ) {
		// We&#039;re going to redirect to the network URL, with some possible modifications.
		$scheme      = is_ssl() ? &#039;https&#039; : &#039;http&#039;;
		$destination = &quot;$scheme://{$current_site-&gt;domain}{$current_site-&gt;path}&quot;;

		/**
		 * 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 WP_Network $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( &#039;ms_site_not_found&#039;, $current_site, $domain, $path );

		if ( $subdomain &amp;&amp; ! defined( &#039;NOBLOGREDIRECT&#039; ) ) {
			// For a &quot;subdomain&quot; installation, redirect to the signup form specifically.
			$destination .= &#039;wp-signup.php?new=&#039; . str_replace( &#039;.&#039; . $current_site-&gt;domain, &#039;&#039;, $domain );
		} elseif ( $subdomain ) {
			/*
			 * For a &quot;subdomain&quot; installation, 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 ( &#039;%siteurl%&#039; !== NOBLOGREDIRECT ) {
				$destination = NOBLOGREDIRECT;
			}
		} elseif ( 0 === strcasecmp( $current_site-&gt;domain, $domain ) ) {
			/*
			 * If the domain we were searching for matches the network&#039;s domain,
			 * it&#039;s no use redirecting back to ourselves -- it&#039;ll cause a loop.
			 * As we couldn&#039;t find a site, we&#039;re simply not installed.
			 */
			return false;
		}

		return $destination;
	}

	// Figure out the current network&#039;s main site.
	if ( empty( $current_site-&gt;blog_id ) ) {
		$current_site-&gt;blog_id = get_main_site_id( $current_site-&gt;id );
	}

	return true;
}

/**
 * Displays a failure message.
 *
 * Used when a blog&#039;s tables do not exist. Checks for a missing $wpdb-&gt;site table as well.
 *
 * @access private
 * @since 3.0.0
 * @since 4.4.0 The `$domain` and `$path` parameters were added.
 *
 * @global wpdb $wpdb WordPress database abstraction object.
 *
 * @param string $domain The requested domain for the error to reference.
 * @param string $path   The requested path for the error to reference.
 */
function ms_not_installed( $domain, $path ) {
	global $wpdb;

	if ( ! is_admin() ) {
		dead_db();
	}

	wp_load_translations_early();

	$title = __( &#039;Error establishing a database connection&#039; );

	$msg   = &#039;&lt;h1&gt;&#039; . $title . &#039;&lt;/h1&gt;&#039;;
	$msg  .= &#039;&lt;p&gt;&#039; . __( &#039;If your site does not display, please contact the owner of this network.&#039; ) . &#039;&#039;;
	$msg  .= &#039; &#039; . __( &#039;If you are the owner of this network please check that your host&amp;#8217;s database server is running properly and all tables are error free.&#039; ) . &#039;&lt;/p&gt;&#039;;
	$query = $wpdb-&gt;prepare( &#039;SHOW TABLES LIKE %s&#039;, $wpdb-&gt;esc_like( $wpdb-&gt;site ) );
	if ( ! $wpdb-&gt;get_var( $query ) ) {
		$msg .= &#039;&lt;p&gt;&#039; . sprintf(
			/* translators: %s: Table name. */
			__( &#039;&lt;strong&gt;Database tables are missing.&lt;/strong&gt; This means that your host&amp;#8217;s database server is not running, WordPress was not installed properly, or someone deleted %s. You really should look at your database now.&#039; ),
			&#039;&lt;code&gt;&#039; . $wpdb-&gt;site . &#039;&lt;/code&gt;&#039;
		) . &#039;&lt;/p&gt;&#039;;
	} else {
		$msg .= &#039;&lt;p&gt;&#039; . sprintf(
			/* translators: 1: Site URL, 2: Table name, 3: Database name. */
			__( &#039;&lt;strong&gt;Could not find site %1$s.&lt;/strong&gt; Searched for table %2$s in database %3$s. Is that right?&#039; ),
			&#039;&lt;code&gt;&#039; . rtrim( $domain . $path, &#039;/&#039; ) . &#039;&lt;/code&gt;&#039;,
			&#039;&lt;code&gt;&#039; . $wpdb-&gt;blogs . &#039;&lt;/code&gt;&#039;,
			&#039;&lt;code&gt;&#039; . DB_NAME . &#039;&lt;/code&gt;&#039;
		) . &#039;&lt;/p&gt;&#039;;
	}
	$msg .= &#039;&lt;p&gt;&lt;strong&gt;&#039; . __( &#039;What do I do now?&#039; ) . &#039;&lt;/strong&gt; &#039;;
	$msg .= sprintf(
		/* translators: %s: Documentation URL. */
		__( &#039;Read the &lt;a href=&quot;%s&quot; target=&quot;_blank&quot;&gt;Debugging a WordPress Network&lt;/a&gt; article. Some of the suggestions there may help you figure out what went wrong.&#039; ),
		__( &#039;https://developer.wordpress.org/advanced-administration/debug/debug-network/&#039; )
	);
	$msg .= &#039; &#039; . __( &#039;If you are still stuck with this message, then check that your database contains the following tables:&#039; ) . &#039;&lt;/p&gt;&lt;ul&gt;&#039;;
	foreach ( $wpdb-&gt;tables( &#039;global&#039; ) as $t =&gt; $table ) {
		if ( &#039;sitecategories&#039; === $t ) {
			continue;
		}
		$msg .= &#039;&lt;li&gt;&#039; . $table . &#039;&lt;/li&gt;&#039;;
	}
	$msg .= &#039;&lt;/ul&gt;&#039;;

	wp_die( $msg, $title, array( &#039;response&#039; =&gt; 500 ) );
}

/**
 * This deprecated function formerly set the site_name property of the $current_site object.
 *
 * This function simply returns the object, as before.
 * The bootstrap takes care of setting site_name.
 *
 * @access private
 * @since 3.0.0
 * @deprecated 3.9.0 Use get_current_site() instead.
 *
 * @param WP_Network $current_site
 * @return WP_Network
 */
function get_current_site_name( $current_site ) {
	_deprecated_function( __FUNCTION__, &#039;3.9.0&#039;, &#039;get_current_site()&#039; );
	return $current_site;
}

/**
 * This deprecated function managed much of the site and network loading in multisite.
 *
 * The current bootstrap code is now responsible for parsing the site and network load as
 * well as setting the global $current_site object.
 *
 * @access private
 * @since 3.0.0
 * @deprecated 3.9.0
 *
 * @global WP_Network $current_site
 *
 * @return WP_Network
 */
function wpmu_current_site() {
	global $current_site;
	_deprecated_function( __FUNCTION__, &#039;3.9.0&#039; );
	return $current_site;
}

/**
 * Retrieves an object containing information about the requested network.
 *
 * {@internal In 4.6.0, converted to use get_network()}
 *
 * @since 3.9.0
 * @deprecated 4.7.0 Use get_network()
 * @see get_network()
 *
 * @param object|int $network The network&#039;s database row or ID.
 * @return WP_Network|false Object containing network information if found, false if not.
 */
function wp_get_network( $network ) {
	_deprecated_function( __FUNCTION__, &#039;4.7.0&#039;, &#039;get_network()&#039; );

	$network = get_network( $network );
	if ( null === $network ) {
		return false;
	}

	return $network;
}
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