Ticket #63045: 63045-cache-count_many_users_posts.diff

Index: src/wp-includes/user.php
===================================================================
--- src/wp-includes/user.php    (revision 60000)
+++ src/wp-includes/user.php    (working copy)
@@
 function count_many_users_posts( $users, $post_type = 'post', $public_only = false ) {
        global $wpdb;
 
        if ( empty( $users ) || ! is_array( $users ) ) {
                return array();
        }
 
+       $cache_key = 'count_many_users_posts:' . md5( maybe_serialize( $users ) . '|' . $post_type . '|' . ( $public_only ? '1' : '0' ) );
+       $cached = wp_cache_get( $cache_key, 'counts' );
+       if ( false !== $cached ) {
+               return $cached;
+       }
+
        $users = array_map( 'intval', $users );
 
        $where = get_posts_by_author_sql( $post_type, true, $users, $public_only );
        $where = preg_replace( '/^\s*AND\s*/', '', $where );
 
        $userlist = implode( ',', $users );
 
        $count = $wpdb->get_results( "SELECT post_author, COUNT(*) AS post_count FROM $wpdb->posts WHERE $where AND post_author IN ($userlist) GROUP BY post_author", ARRAY_A );
 
        $counts = array_fill_keys( $users, 0 );
        foreach ( $count as $row ) {
                $counts[ $row['post_author'] ] = (int) $row['post_count'];
        }
+
+       wp_cache_set( $cache_key, $counts, 'counts' );
 
        return $counts;
 }