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Source View: get_{$adjacent}_post_sort

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Line Code
1175           }
1176      }
1177
1178      $adjacent = $previous ? 'previous' : 'next';
1179      $op = $previous ? '<' : '>';
1180      $order = $previous ? 'DESC' : 'ASC';
1181
1182      $join  = apply_filters( "get_{$adjacent}_post_join", $join, $in_same_term, $excluded_terms );
1183      $where = apply_filters( "get_{$adjacent}_post_where", $wpdb->prepare( "WHERE p.post_date $op %s AND p.post_type = %s AND p.post_status = 'publish' $posts_in_ex_terms_sql", $current_post_date, $post->post_type), $in_same_term, $excluded_terms );
1184      $sort  = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1" );
1185
1186      $query = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort";
1187      $query_key = 'adjacent_post_' . md5( $query );
1188      $result = wp_cache_get( $query_key, 'counts' );
1189      if ( false !== $result ) {
1190           if ( $result )
1191                $result = get_post( $result );
1192           return $result;
1193      }