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<title>[41861] trunk: Multisite: Take `WP_Network::$blog_id` into account in `get_main_site_id()`.</title>
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<dt style="float: left; width: 6em; font-weight: bold">Revision</dt> <dd><a style="font-weight: bold" href="https://core.trac.wordpress.org/changeset/41861">41861</a><script type="application/ld+json">{"@context":"http://schema.org","@type":"EmailMessage","description":"Review this Commit","action":{"@type":"ViewAction","url":"https://core.trac.wordpress.org/changeset/41861","name":"Review Commit"}}</script></dd>
<dt style="float: left; width: 6em; font-weight: bold">Author</dt> <dd>flixos90</dd>
<dt style="float: left; width: 6em; font-weight: bold">Date</dt> <dd>2017-10-14 22:41:15 +0000 (Sat, 14 Oct 2017)</dd>
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<pre style='padding-left: 1em; margin: 2em 0; border-left: 2px solid #ccc; line-height: 1.25; font-size: 105%; font-family: sans-serif'>Multisite: Take `WP_Network::$blog_id` into account in `get_main_site_id()`.

When the `WP_Network::$blog_id` property is set manually, for example in the multisite bootstrap process, `get_main_site_id()` should use that value instead of running its own logic. The main logic for the function was therefore moved into the internal `WP_Network::get_main_site_id()` method, which is now being accessed by the function through the magic property handling for `WP_Network::$blog_id` (and its equivalent `WP_Network::$site_id`).

Props spacedmonkey, jeremyfelt.
Fixes <a href="https://core.trac.wordpress.org/ticket/41936">#41936</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunksrcwpincludesclasswpnetworkphp">trunk/src/wp-includes/class-wp-network.php</a></li>
<li><a href="#trunksrcwpincludesfunctionsphp">trunk/src/wp-includes/functions.php</a></li>
<li><a href="#trunktestsphpunittestsmultisitegetMainSiteIdphp">trunk/tests/phpunit/tests/multisite/getMainSiteId.php</a></li>
</ul>

</div>
<div id="patch">
<h3>Diff</h3>
<a id="trunksrcwpincludesclasswpnetworkphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/class-wp-network.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/class-wp-network.php        2017-10-13 21:20:42 UTC (rev 41860)
+++ trunk/src/wp-includes/class-wp-network.php  2017-10-14 22:41:15 UTC (rev 41861)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -148,9 +148,9 @@
</span><span class="cx" style="display: block; padding: 0 10px">                        case 'id':
</span><span class="cx" style="display: block; padding: 0 10px">                                return (int) $this->id;
</span><span class="cx" style="display: block; padding: 0 10px">                        case 'blog_id':
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+                                return (string) $this->get_main_site_id();
+                       case 'site_id':
</ins><span class="cx" style="display: block; padding: 0 10px">                                 return $this->get_main_site_id();
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                        case 'site_id':
-                               return (int) $this->get_main_site_id();
</del><span class="cx" style="display: block; padding: 0 10px">                 }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">                return null;
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -208,16 +208,68 @@
</span><span class="cx" style="display: block; padding: 0 10px">         * properties.
</span><span class="cx" style="display: block; padding: 0 10px">         *
</span><span class="cx" style="display: block; padding: 0 10px">         * @since 4.9.0
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-         * @see get_main_site_id()
</del><span class="cx" style="display: block; padding: 0 10px">          *
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-         * @return string Main site ID as numeric string, for compatibility reasons.
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+  * @return int The ID of the main site.
</ins><span class="cx" style="display: block; padding: 0 10px">          */
</span><span class="cx" style="display: block; padding: 0 10px">        private function get_main_site_id() {
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                if ( empty( $this->blog_id ) ) {
-                       $this->blog_id = (string) get_main_site_id( $this->id );
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         /**
+                * Filters the main site ID.
+                *
+                * Returning a positive integer will effectively short-circuit the function.
+                *
+                * @since 4.9.0
+                *
+                * @param int|null $main_site_id If a positive integer is returned, it is interpreted as the main site ID.
+                * @param int $network_id The ID of the network for which the main site was detected.
+                */
+               $main_site_id = (int) apply_filters( 'pre_get_main_site_id', null, $this->id );
+               if ( 0 < $main_site_id ) {
+                       return $main_site_id;
</ins><span class="cx" style="display: block; padding: 0 10px">                 }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-                return $this->blog_id;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+         if ( 0 < (int) $this->blog_id ) {
+                       return (int) $this->blog_id;
+               }
+
+               if ( ( defined( 'DOMAIN_CURRENT_SITE' ) && defined( 'PATH_CURRENT_SITE' ) && $this->domain === DOMAIN_CURRENT_SITE && $this->path === PATH_CURRENT_SITE )
+                       || ( defined( 'SITE_ID_CURRENT_SITE' ) && $this->id == SITE_ID_CURRENT_SITE ) ) {
+                       if ( defined( 'BLOG_ID_CURRENT_SITE' ) ) {
+                               $this->blog_id = (string) BLOG_ID_CURRENT_SITE;
+
+                               return (int) $this->blog_id;
+                       }
+
+                       if ( defined( 'BLOGID_CURRENT_SITE' ) ) { // deprecated.
+                               $this->blog_id = (string) BLOGID_CURRENT_SITE;
+
+                               return (int) $this->blog_id;
+                       }
+               }
+
+               $site = get_site();
+               if ( $site->domain === $this->domain && $site->path === $this->path ) {
+                       $main_site_id = (int) $site->id;
+               } else {
+                       $cache_key = 'network:' . $this->id . ':main_site';
+
+                       $main_site_id = wp_cache_get( $cache_key, 'site-options' );
+                       if ( false === $main_site_id ) {
+                               $_sites = get_sites( array(
+                                       'fields'     => 'ids',
+                                       'number'     => 1,
+                                       'domain'     => $this->domain,
+                                       'path'       => $this->path,
+                                       'network_id' => $this->id,
+                               ) );
+                               $main_site_id = ! empty( $_sites ) ? array_shift( $_sites ) : 0;
+
+                               wp_cache_add( $cache_key, $main_site_id, 'site-options' );
+                       }
+               }
+
+               $this->blog_id = (string) $main_site_id;
+
+               return (int) $this->blog_id;
</ins><span class="cx" style="display: block; padding: 0 10px">         }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px">        /**
</span></span></pre></div>
<a id="trunksrcwpincludesfunctionsphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/src/wp-includes/functions.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/src/wp-includes/functions.php       2017-10-13 21:20:42 UTC (rev 41860)
+++ trunk/src/wp-includes/functions.php 2017-10-14 22:41:15 UTC (rev 41861)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -4431,51 +4431,7 @@
</span><span class="cx" style="display: block; padding: 0 10px">                return 0;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><del style="background-color: #fdd; text-decoration:none; display:block; padding: 0 10px">-        /**
-        * Filters the main site ID.
-        *
-        * Returning anything other than null will effectively short-circuit the function, returning
-        * the result parsed as an integer immediately.
-        *
-        * @since 4.9.0
-        *
-        * @param int|null $main_site_id If anything other than null is returned, it is interpreted as the main site ID.
-        * @param int $network_id The ID of the network for which the main site was detected.
-        */
-       $main_site_id = apply_filters( 'pre_get_main_site_id', null, $network->id );
-       if ( null !== $main_site_id ) {
-               return (int) $main_site_id;
-       }
-
-       if ( ( defined( 'DOMAIN_CURRENT_SITE' ) && defined( 'PATH_CURRENT_SITE' ) && $network->domain === DOMAIN_CURRENT_SITE && $network->path === PATH_CURRENT_SITE )
-            || ( defined( 'SITE_ID_CURRENT_SITE' ) && $network->id == SITE_ID_CURRENT_SITE ) ) {
-               if ( defined( 'BLOG_ID_CURRENT_SITE' ) ) {
-                       return BLOG_ID_CURRENT_SITE;
-               } elseif ( defined( 'BLOGID_CURRENT_SITE' ) ) { // deprecated.
-                       return BLOGID_CURRENT_SITE;
-               }
-       }
-
-       $site = get_site();
-       if ( $site->domain === $network->domain && $site->path === $network->path ) {
-               $main_site_id = (int) $site->id;
-       } else {
-               $main_site_id = wp_cache_get( 'network:' . $network->id . ':main_site', 'site-options' );
-               if ( false === $main_site_id ) {
-                       $_sites = get_sites( array(
-                               'fields'     => 'ids',
-                               'number'     => 1,
-                               'domain'     => $network->domain,
-                               'path'       => $network->path,
-                               'network_id' => $network->id,
-                       ) );
-                       $main_site_id = ! empty( $_sites ) ? array_shift( $_sites ) : 0;
-
-                       wp_cache_add( 'network:' . $network->id . ':main_site', $main_site_id, 'site-options' );
-               }
-       }
-
-       return (int) $main_site_id;
</del><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+ return $network->site_id;
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> /**
</span></span></pre></div>
<a id="trunktestsphpunittestsmultisitegetMainSiteIdphp"></a>
<div class="modfile"><h4 style="background-color: #eee; color: inherit; margin: 1em 0; padding: 1.3em; font-size: 115%">Modified: trunk/tests/phpunit/tests/multisite/getMainSiteId.php</h4>
<pre class="diff"><span>
<span class="info" style="display: block; padding: 0 10px; color: #888">--- trunk/tests/phpunit/tests/multisite/getMainSiteId.php     2017-10-13 21:20:42 UTC (rev 41860)
+++ trunk/tests/phpunit/tests/multisite/getMainSiteId.php       2017-10-14 22:41:15 UTC (rev 41861)
</span><span class="lines" style="display: block; padding: 0 10px; color: #888">@@ -105,6 +105,39 @@
</span><span class="cx" style="display: block; padding: 0 10px">        public function filter_get_main_site_id() {
</span><span class="cx" style="display: block; padding: 0 10px">                return 333;
</span><span class="cx" style="display: block; padding: 0 10px">        }
</span><ins style="background-color: #dfd; text-decoration:none; display:block; padding: 0 10px">+
+       /**
+        * @ticket 41936
+        */
+       public function test_get_main_site_id_with_property_value() {
+               global $current_site;
+
+               $original_main_site_id = $current_site->blog_id;
+               $current_site->blog_id = '123';
+
+               $result = get_main_site_id();
+
+               $current_site->blog_id = $original_main_site_id;
+
+               $this->assertSame( 123, $result );
+       }
+
+       /**
+        * @ticket 41936
+        */
+       public function test_get_main_site_id_filtered_with_property_value() {
+               global $current_site;
+
+               $original_main_site_id = $current_site->blog_id;
+               $current_site->blog_id = '123';
+
+               add_filter( 'pre_get_main_site_id', array( $this, 'filter_get_main_site_id' ) );
+               $result = get_main_site_id();
+
+               $current_site->blog_id = $original_main_site_id;
+
+               $this->assertSame( 333, $result );
+       }
</ins><span class="cx" style="display: block; padding: 0 10px"> }
</span><span class="cx" style="display: block; padding: 0 10px"> 
</span><span class="cx" style="display: block; padding: 0 10px"> endif;
</span></span></pre>
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