Create a renderable array for checkbox

Question

I want to inject a checkbox within a preprocess function and I think it should be a renderable array.

What is the structure of a renderable array for a checkbox?

Update:

I use profile2 module and have created profile checkbox fields. While viewing profile currently the field are show as just text. I want to show it as disabled checkbox with state. So it is not within a form.

Answer 1

Assuming that your render array is part of a form (outside of which a checkbox doesn't make a whole lot of sense), you would do it like this:

$form['checkbox'] = array(
  '#type' => 'checkbox',
  '#title' => 'Title',
  '#default_value' => 1, // Checked by default
);

Have a look at the checkbox type documentation for all of the available properties.

EDIT

Just to add that render($form['checkbox']); also works perfectly outside of the form context using the above code; the correct checkbox element is rendered, but without the "name" and "id" attributes.