get textbooks Published between YEAR provided[publication_date] and today

       

// model function
// get textbooks Published between YEAR provided[publication_date] and today

if ($data_search["publication_date"]!='')    
           $this->db->where('publication_date >=', date("Y-m-d", mktime(0, 0, 0, 1, 1, $data_search["publication_date"])));

// you have any idea how compare dates???


// PHP my admin the field is Date field
publication_date   date