custom-meta-box #3

// Wrap all categories in a function
function wcat2() {
    $out = array();
    $categories = get_categories();
    foreach( $categories as $category ) {
        $out[$category->term_id] = array(
            'label' => $category->slug,
            'value' => $category->term_id
        );
    }
    return $out;
}

With the code below we'll create the custom meta box:

  // Add the Meta Box
function home_custom_meta_box() {
    add_meta_box(
		'home_meta_box', // $id
		'Custom Meta Box', // $title 
		'home_show_custom_meta_box', // $callback
		'page', // $page
		'normal', // $context
		'high'); // $priority
}
add_action('add_meta_boxes', 'home_custom_meta_box');