I have tbl_invoice.first_name and tbl_invoice.last_name as name, so want to search by name in Codeigniter with LIKE. (example: first_name = Sanjib, last_name = Sarkar, name = Sanjib Sarkar . Search by "Sanjib Sarkar")

$this->db->select('tbl_invoice.*,tbl_members.*');
$this->db->from('tbl_invoice');
$this->db->join('tbl_members', 'tbl_members.id = tbl_invoice.member_id', 'left');
$this->db->like(CONCAT('tbl_invoice.first_name'." ".'tbl_invoice.last_name'), $search_value);
$query = $this->db->get();