Incompatible with WP 3.9

See: http://make.ww.wp.xz.cn/core/2014/04/07/mysql-in-wordpress-3-9/

The plugin presumes the deprecated MySQL interface is being used by WordPress and calls raw mysql_ functions, thus it does not work when used with WP 3.9 on a system with MySQLi or later, PDO, available.

https://ww.wp.xz.cn/plugins/search-and-replace/