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Source View: get_{$adjacent}_post_sort

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Line Code
1944       *
1945       * @since 2.5.0
1946       * @since 4.4.0 Added the `$post` parameter.
1947       * @since 4.9.0 Added the `$order` parameter.
1948       *
1949       * @param string $order_by The `ORDER BY` clause in the SQL.
1950       * @param WP_Post $post    WP_Post object.
1951       * @param string  $order   Sort order. 'DESC' for previous post, 'ASC' for next.
1952       */
1953      $sort = apply_filters( "get_{$adjacent}_post_sort", "ORDER BY p.post_date $order LIMIT 1", $post, $order );
1954
1955      $query     = "SELECT p.ID FROM $wpdb->posts AS p $join $where $sort";
1956      $query_key = 'adjacent_post_' . md5( $query );
1957      $result    = wp_cache_get( $query_key, 'counts' );
1958      if ( false !== $result ) {
1959           if ( $result ) {
1960                $result = get_post( $result );
1961           }
1962           return $result;