表单下拉列表需要codeigniter

Question

我有这样的代码

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<div class="col-sm-9">
 <?php $attributes = 'class = "form-control" id = "actype"';
echo form_dropdown('actype',$actype,set_value('actype',$detail[0]>activity_type),$attributes);?>
</div>

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我的模特：

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function get_actype()
	{
		$type_id = array('-SELECT-');
		$type_name = array('-SELECT-');

		for ($i = 0; $i < count($result); $i++)
		{
			array_push($type_id, $result[$i]->activity_type_id);
			array_push($type_name, $result[$i]->activity_type_name);
		}
		return $actype_result = array_combine($type_id, $type_name);

	}

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如何创建所需的验证下拉列表