$bc = new Basecamp('https://your.basecamp.url','username','password');

$bc->set_project_id(PROJECT-ID); // required
$bc->set_category_id(CATEGORY-ID); // required
$bc->set_is_private(1); // optional - (0) or don't set it for non-private
$bc->post_message('MESSAGE TITLE','MESSAGE BODY');

$bc->set_resource_id(RESOURCE-ID);
// All of these parameters are optional - updates what you provide.
$params = array("title" => "TITLE", "body" => "BODY", "category_id" => CAT-ID, "milestone_id" => 'MILESTONE-ID');
$bc->update_message($params);

// Resource ID (integer) for any message, to-do list, or milestone
$bc->set_resource_id(RESOURCE-ID);
// Resource Type [posts|milestones|todo_items]
$bc->set_resource(RESOURCE-TYPE);
$bc->post_comment('TITLE','MESSAGE');

$bc->set_project_id(PROJECT-ID); // required
$bc->set_is_private(1); // optional - (0) or don't set it for non-private
$bc->post_todo_list('TITLE','DESCRIPTION'); // Description is optional

$bc->set_todo_list_id(LIST-ID); // required
$bc->post_todo_item('ITEM-TEXT',PERSON-ID,1); // 1 is optional for notification

$bc->set_project_id(PROJECT-ID); // required
$bc->set_deadline('DD-MM-YYYY'); // Required
// Returns the newly created Milestone's ID
$id = $bc->post_milestone('TITLE',PERSON-ID, 1); // 1 is optional for notification

// attach_file requires (ABSOLUTE-PATH, TITLE, MIME-TYPE)
// http://www.webmaster-toolkit.com/mime-types.shtml
$bc->attach_file($_SERVER['DOCUMENT_ROOT'].'/images/test.jpg','Test Image','image/jpeg');
$bc->set_project_id(15598);
$bc->set_is_private(1); // Optional
$bc->post_message('TITLE','BODY');
// Remove file attachments from PHP Class
$bc->clear_attachment_xml();

$bc->set_project_id(PROJECT-ID); // Required
// Defaults to "Post" - you can pass it "attachment" if you wish.
// Returns an array: $categories[0]['name'] and $categories[0]['id']
$categories = $bc->get_categories();

$bc->set_project_id(PROJECT-ID); // Required
// Defaults to "Post" - you can pass it "attachment" if you wish.
// Returns the ID (Typical Basecamp - whichever one is alphabetically first)
$id = $bc->get_default_category_id();

$bc->set_basecamp_url($url);
$bc->set_username($user);
$bc->set_password($pass);
$bc->set_resource_id($id);
$bc->set_resource($resource);
$bc->set_category_id($id);
$bc->set_project_id($id);
$bc->set_todo_list_id($id);
$bc->set_person_id($id);
$bc->set_deadline($deadline);
$bc->set_is_private($bool);
 
$bc->get_basecamp_url();
$bc->get_username();
$bc->get_password();
$bc->get_request_url();
$bc->get_resource();
$bc->get_resource_id();
$bc->get_category_id();
$bc->get_project_id();
$bc->get_todo_list_id();
$bc->get_person_id();
$bc->get_deadline();
$bc->get_post_resource_id();
$bc->get_upload_id();
$bc->get_attachment_xml();
$bc->get_is_private();
 
$bc->clear_attachment_xml();