gistfile1.aw

<?php

// menu callback that returns NULL, used for web services
function article_callback_json($node) {
  $arr = array('a' => 1, 'b' => 2, 'c' => 3, 'd' => 4, 'e' => 5);
  print json_encode($arr); // {"a":1,"b":2,"c":3,"d":4,"e":5}
  return NULL;
}

//menu callback that returns a string for Drupal to wrap in the page layout
function article_callback_string($node) {
  return "<h2>" . $node->title . "</h2> <div>" . $node->body . "</div>"; 
}

//menu callback that returns a renderable array for Drupal to render
function article_callback_array($node) {
  return array(
    '#theme' => 'node_article',
    '#article_title' => $node->title,
    '#article_body' => $node->body, 
  );		
}