A very basic example of register_post_type() in WordPress

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<?php
/*
 * Creates a custom post type with the key 'prefix_post_type', with a basic
 * configuration that provides for public access on the front end and admin.
 *
*/
add_action( 'init', 'prefix_register_post_type' );
function prefix_register_post_types() {
	$public_pt_args = array(
		'label' => 'My Post Type',
		'public' => true,
		'publicly_queryable' => true,
		'exclude_from_search' => false,
		'show_ui' => true,
		'show_in_menu' => true,
		'has_archive' => true,
		'rewrite' => true,
		'query_var' => true,
	);
	register_post_type( 'prefix_post_type', $public_pt_args );
}