Ticket #14405: 14405.transient.1.diff

Index: wp-includes/author-template.php
===================================================================
--- wp-includes/author-template.php     (revision 17784)
+++ wp-includes/author-template.php     (working copy)
@@ -368,4 +368,33 @@
        echo $return;
 }
 
+/**
+ * Does this site have more than one author
+ * 
+ * Checks to see if more than one author has published posts.
+ * 
+ * @return bool Whether or not we have more than one author
+ */
+function is_multi_author() {
+       global $wpdb;
+       
+       if ( false === ( $is_multi_author = get_transient( 'is_multi_author_posts' ) ) ) {
+               $rows = (array) $wpdb->get_col( "SELECT DISTINCT post_author FROM $wpdb->posts WHERE post_type = 'post' AND post_status = 'publish' LIMIT 2" );
+               $is_multi_author = 1 < count( $rows ) ? 1 : 0;
+               set_transient( 'is_multi_author_posts', $is_multi_author, 86400 );
+       }
+
+       return (bool) $is_multi_author;
+}
+
+/** 
+ * Helper function to clear the cache for number of authors.
+ * 
+ * @private
+ */
+function __clear_multi_author_cache() {
+       delete_transient( 'is_multi_author_posts' );
+}
+add_action( 'transition_post_status', '__clear_multi_author_cache' );
+
 ?>