Assign custom post type labels quickly [WordPress]

register_post_type_labels.php

<?php
/**
 * Assign custom post type labels quickly
 * 
 * @param string $singular
 * @param string $plural
 * @return array
*/
function register_post_type_labels( $singular, $plural = NULL )
{
	$plural = $plural == NULL ? $singular . 's' : $plural;
	return array(
		'name'                => $plural,
		'singular_name'       => $singular,
		'add_new'             => 'Add New ' . $singular,
		'add_new_item'        => 'Add New ' . $singular,
		'edit_item'           => 'Edit ' . $singular,
		'new_item'            => 'New ' . $singular,
		'view_item'           => 'View ' . $singular,
		'search_items'        => 'Search ' . $plural,
		'not_found'           => 'No ' . $plural . ' found',
		'not_found_in_trash'  => 'No ' . $plural .' found in Trash',
		'parent_item_colon'   => 'Parent '. $singular . ':',
		'menu_name'           =>  $plural,
	);
}