Add radiobutton to hook_form

I want to add radiobuttons to my module. How can I add using Add radiobutton to hoo开发者_如何学运维k_form?

function mymodule_some_form($form_state) {
  $form['radio'] = array(
    '#type' => 'radios',
    '#title' => 'Title',
    '#options' => array(0 => 'First', 1 => 'Second', 3 => 'Third'),
    '#attributes' => array('style' => 'display:inline-block;')
  );

  $form['select'] = array(
    '#type' => 'select',
    '#title' => 'Title',
    '#options' => array(0 => 'First', 1 => 'Second', 3 => 'Third'),
    '#attributes' => array('style' => 'display:inline-block;')
  );
}

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