Select2 Dynamic

    <script type="text/javascript">
        $(document).ready(function() {
            $('.select2').select2();
            $('#project_id').select2({
                ajax: {
                    url:"<?=base_url('projects/getprojectlist');?>",
                    type: "post",
                    dataType: 'json',
                    delay:250,
                    data: function (params) {
                        return {
                            searchTerm: params.term || "",
                            page: params.page ||1
                        }
                    },
                    processResults: function (data, params) {
                    console.log(data);
                    page = params.page || 1;
                      return {
                        results: $.map(data, function (item) { return {id: item.id, text: item.text}}),
                        pagination: {
                            more: (page * 10) <= data[0].total_count
                        }
                      };
                    },
                    cache:false,
                }
            });
    </script>

public function getuserslist()
{
        // Search term
        $searchTerm = $this->input->post('searchTerm');
        // Get Projects
        $response = $this->users_model->getUsersList($searchTerm);
        echo json_encode($response);
}

function getUsersList($searchTerm="")
{
     // Fetch users
    $this->db->select('*');
    $this->db->where("first_name like '%".$searchTerm."%' ");
    $fetched_users = $this->db->get('tbl_users');
    $users = $fetched_users->result_array();
    // Initialize Array with fetched data
    $data = array();
    foreach($users as $user){
        $data[] = array("id"=>$user['id'], "text"=>$user['first_name']);
    }
    return $data;
}