Drupal 7 - Create your custom Hello World module

; $Id$
 
name = helloworld
description = Reinholds Hello World module
package = Reinholds modules
core = 7.x
 
files[] = helloworld.module

<?php
 function helloworld_menu(){
   $items = array();
 
   $items['helloworld'] = array(
     'title'            => t('Hello world'),
     'page callback'    => 'helloworld_output',
     'access arguments' => array('access content'),
   );
 
   return $items;
 }
 
 /*
 * Display output
 */
 function helloworld_output() {
   header('Content-type: text/plain; charset=UTF-8');
   header('Content-Disposition: inline');
   return 'helloworld';
 }
?>

<?php
print $content;
?>