How to pass value of selected checkbox to wordpress function array?

Question

WordPress

Hello! I'm trying to write the first plugin for wordpress (for myself). And here is the hitch with passing the variable to the array from the selected checkbox.
There is an array:

$posts = get_posts(array(
        'post_type'  => array('post','page')			
    ));

Here it is clear that we are receiving data and working with wordpress posts and pages. But here I thought that it is not always convenient to get into the code and change the array (when only pages are needed), but to do this using variables or substituting the value of the selected checkbox.
Made checkboxes:

<input type="checkbox" id="show_pages" value="page" /> Страницы
<input type="checkbox" id="show_posts" value="post" /> Записи

I don't know how to join them further with the array.

Answer 1

Settings API .
Well, or quite simply - checkboxes in the form, when submitting the form, do update_option( 'option_name' ). Then your output code will be like this:

$types = get_option( 'option_name' );
$posts = get_posts(array(
    'post_type'  => $types,
));