สอบถามเรื่อง array หน่อยครับ พอดีใช้ array_push แล้วเราสามารถกำหนดชื่อ index ให้ array ได้หรือเปล่าครับ

	public function save_staff()
	{
		$ar = array(
			'code'=>$this->input->post('code'),
			'id_card'=>$this->input->post('id_card'),
			'fname'=>$this->input->post('fname'),
			'lname'=>$this->input->post('lname'),
			'sex'=>$this->input->post('sex'),
			'b_date'=>$this->input->post('b_date'),
			'education_id'=>$this->input->post('education'),
			'deegree'=>$this->input->post('deegree'),
			'address'=>$this->input->post('address'),
			'nationality_id'=>$this->input->post('nationality_id'),
			'region_id'=>$this->input->post('region_id'),
			'company_id'=>$this->input->post('company_id'),
			'org_id'=>$this->input->post('org_id'),
			'position_id'=>$this->input->post('position_id'),
			'start_work'=>$this->input->post('start_work'),
			'status'=>'1',
			'person'=>'admin',
			'add_date'=>date('Y-m-d'),			
		);
		$ar1=array(
			'user_group'=>1,
			'user_name'=>$this->input->post('code'),
			'user_password'=>md5($this->input->post('code')),
			'create_date'=>date('Y-m-d')
		);	
		if($this->staff->add($ar,$ar1))
		{
			/*redirect('hr/admin_manpower/manage_staff');*/
		}
	}