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<title>[20152] trunk/wp-includes/theme.php: In wp_get_themes() under multisite, filter out allowed themes before creating WP_Theme objects, rather than after.</title>
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<dl class="meta">
<dt>Revision</dt> <dd><a href="http://core.trac.wordpress.org/changeset/20152">20152</a></dd>
<dt>Author</dt> <dd>nacin</dd>
<dt>Date</dt> <dd>2012-03-08 07:46:39 +0000 (Thu, 08 Mar 2012)</dd>
</dl>

<h3>Log Message</h3>
<pre>In wp_get_themes() under multisite, filter out allowed themes before creating WP_Theme objects, rather than after. search_theme_directories() provides us the stylesheet of each theme which is all we need to do the proper intersection. This results in major performance gains on sites that have large numbers of themes unavailable to them. see <a href="http://core.trac.wordpress.org/ticket/20103">#20103</a>.</pre>

<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkwpincludesthemephp">trunk/wp-includes/theme.php</a></li>
</ul>

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<h3>Diff</h3>
<a id="trunkwpincludesthemephp"></a>
<div class="modfile"><h4>Modified: trunk/wp-includes/theme.php (20151 => 20152)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/wp-includes/theme.php        2012-03-08 07:32:42 UTC (rev 20151)
+++ trunk/wp-includes/theme.php        2012-03-08 07:46:39 UTC (rev 20152)
</span><span class="lines">@@ -25,45 +25,50 @@
</span><span class="cx">         $defaults = array( 'errors' =&gt; false, 'allowed' =&gt; null, 'blog_id' =&gt; 0 );
</span><span class="cx">         $args = wp_parse_args( $args, $defaults );
</span><span class="cx"> 
</span><del>-        static $_themes;
-        if ( ! isset( $_themes ) ) {
-                $_themes = array();
-                $theme_data = search_theme_directories();
-                // Make sure the current theme wins out, in case search_theme_directories() picks the wrong
-                // one in the case of a conflict. (Normally, last registered theme root wins.)
-                $current_theme = get_stylesheet();
-                $current_theme_root = get_raw_theme_root( $current_theme );
-                if ( ! in_array( $current_theme_root, $wp_theme_directories ) )
-                        $current_theme_root = WP_CONTENT_DIR . $current_theme_root;
-                foreach ( (array) $theme_data as $theme_slug =&gt; $data ) {
-                        if ( $current_theme == $theme_slug &amp;&amp; $current_theme_root != $data['theme_root'] )
-                                $_themes[ $theme_slug ] = new WP_Theme( $theme_slug, $current_theme_root );
-                        else
-                                $_themes[ $theme_slug ] = new WP_Theme( $theme_slug, $data['theme_root'] );
</del><ins>+        static $_theme_directories, $_themes = array();
+        if ( ! isset( $_theme_directories ) ) {
+                $_theme_directories = search_theme_directories();
+                if ( count( $wp_theme_directories ) &gt; 1 ) {
+                        // Make sure the current theme wins out, in case search_theme_directories() picks the wrong
+                        // one in the case of a conflict. (Normally, last registered theme root wins.)
+                        $current_theme = get_stylesheet();
+                        $root_of_current_theme = get_raw_theme_root( $current_theme );
+                        if ( ! in_array( $root_of_current_theme, $wp_theme_directories ) )
+                                $root_of_current_theme = WP_CONTENT_DIR . $current_theme_root;
+                        $_theme_directories[ $current_theme ]['theme_root'] = $root_of_current_theme;
</ins><span class="cx">                 }
</span><span class="cx">         }
</span><span class="cx"> 
</span><del>-        $themes = $_themes;
-        if ( empty( $themes ) )
-                return $themes;
</del><ins>+        if ( empty( $_theme_directories ) )
+                return array();
</ins><span class="cx"> 
</span><del>-        if ( null !== $args['errors'] ) {
-                foreach ( $themes as $theme_slug =&gt; $theme ) {
-                        if ( $theme-&gt;errors() != $args['errors'] )
-                                unset( $themes[ $theme_slug ] );
-                }
</del><ins>+        $theme_directories = $_theme_directories;
+
+        if ( is_multisite() &amp;&amp; null !== $args['allowed'] ) {
+                $allowed = $args['allowed'];
+                if ( 'network' === $allowed )
+                        $theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed_on_network( $args['blog_id'] ) );
+                elseif ( 'site' === $allowed )
+                        $theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed_on_site( $args['blog_id'] ) );
+                elseif ( $allowed )
+                        $theme_directories = array_intersect_key( $theme_directories, WP_Theme::get_allowed( $args['blog_id'] ) );
+                else
+                        $theme_directories = array_diff_key( $theme_directories, WP_Theme::get_allowed( $args['blog_id'] ) );
</ins><span class="cx">         }
</span><span class="cx"> 
</span><del>-        if ( is_multisite() &amp;&amp; null !== $args['allowed'] ) {
-                if ( $allowed = $args['allowed'] ) {
-                        if ( 'network' === $allowed )
-                                $themes = array_intersect_key( $themes, WP_Theme::get_allowed_on_network( $args['blog_id'] ) );
-                        elseif ( 'site' === $allowed )
-                                $themes = array_intersect_key( $themes, WP_Theme::get_allowed_on_site( $args['blog_id'] ) );
-                        else
-                                $themes = array_intersect_key( $themes, WP_Theme::get_allowed( $args['blog_id'] ) );
-                } else {
-                        $themes = array_diff_key( $themes, WP_Theme::get_allowed( $args['blog_id'] ) );
</del><ins>+        $themes = array();
+
+        foreach ( $theme_directories as $theme =&gt; $theme_root ) {
+                if ( isset( $_themes[ $theme ] ) )
+                        $themes[ $theme ] = $_themes[ $theme ];
+                else
+                        $themes[ $theme ] = $_themes[ $theme ] = new WP_Theme( $theme, $theme_root['theme_root'] );
+        }
+
+        if ( null !== $args['errors'] ) {
+                foreach ( $themes as $theme =&gt; $wp_theme ) {
+                        if ( $wp_theme-&gt;errors() != $args['errors'] )
+                                unset( $themes[ $theme ] );
</ins><span class="cx">                 }
</span><span class="cx">         }
</span><span class="cx"> 
</span></span></pre>
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