How to Create Drupal Module

Folder for our module

Create new folder in sites/all/modules directory. My module name is Hello World so I'll name the folder to hello_world.

Info file

Create a new file called hello_world.info.

Source code viewer
; $Id: hello_world.info
name = Hello World
description = "Hello World page."
core = 7.x
files[] = hello_world.module
Programming Language: YAML

If you use drupal 6 not 7 then remove files variable and change core to 6.x.

PHP file

You can access the page from http://example.com/admin/hello_world. Don't forget to enable the module and if you make changes in function names then you have to clear drupals cache.

Source code viewer
<?php
 
/**
* Implementation of hook_menu().
*/
function hello_world_menu()
{
  $items['admin/hello_world'] = array( // path to your module output
    'title' => 'Hello World', // page title
    'page callback' => 'hello_world_page', // function that is called when you land to this url
    'access callback' => TRUE, // always and everybody can access this url
    'type' => MENU_CALLBACK, // no menu item will be made, simple callback is made
  );
  return $items;
}
 
/**
* Page callback.
*/
function hello_world_page()
{
  /**
    If you return you get you content in Drupal if you echo you get your results in plain html. 
    This way you can output xml or what ever content you might need
  */
  return 'Hello, World!';
}
Programming Language: PHP