<select name="id_group" id="select_group" class="form-control" style="text-align-last: center;" required>
                                                        <option value='115'>115</option>
                                                    </select>
/*Для View-ера*/
        $.ajax({
                            url: "<?php echo base_url("panel/ajax_loading_groups") ?>",
                            type: "post",
                            dataType: "html",
                            success:function(data){
                                $('#select_group').fadeTo("fast", 0).delay(500).fadeTo('fast',1).html(data);
                                $('#select_group').val(" ");
                            },
                            error: function(xhr, status, error) {
                                console.log(xhr)
                                console.log(error);
                            }
        });
/*Controller*/
    public function loading_groups(){
        $this->load->helper('form');
        if(logged_in()){
            if(check_rules()){
                if ($groups = R::getAll('select * from students')){
                    $result = unique_multidim_array($groups, 'id_course');
                    foreach($result as $item){
                        $data .= '<option value='.$item['id_course'].'>'.$item['id_course'].'</option>';
                    }
                }else{
                    $data = '<div class="<div class="alert alert-danger" role="alert">Курсы студентов не найдены!' . '</div>';
                }
                echo $data;
            }
        }
    }