There is an issue with LIKE method of query builder class when 'BEFORE' parameter is passed.

This code generates database error :
$this->db->select('*')->like('id', 'zefzefezf', 'BEFORE')->get('email_v2');

Result :
SELECT * FROM email_v2 WHERE id LIKE %'zefzefezf' ESCAPE '!'

The 'BOTH' and 'AFTER' parameter are working properly.