example-hook-tokens.php

<?php
/**
 * Implements hook_tokens().
 */
function cake_tokens($type, $tokens, array $data = array(), array $options = array()) {
  $sanitize = !empty($options ['sanitize']);

  $replacements = array();

  if ($type == 'cake' && !empty($data['cake'])) {
    $cake = $data['cake'];
    foreach ($tokens as $name => $original) {
      switch ($name) {  
        // Default values for the chained tokens handled below.
        case 'author':
          if ($cake->uid) {
            $account = user_load($cake->uid);
            $replacements[$original] = $sanitize ? check_plain(format_username($account)) : format_username($account);
          }
          break;
        case 'recipe':
          if ($cake->recipe_nid) {
            $node = node_load($cake->recipe_nid);
            $replacements[$original] = $sanitize ? check_plain($node->title) : $node->title;
          }
          break;
      }
    }

    // Replace the user tokens chained below the cake author token.
    if ($user_tokens = token_find_with_prefix($tokens, 'author')) {
      $account = user_load($cake->uid);
      $replacements += token_generate('user', $user_tokens, array('user' => $account), $options);
    }
    
    // Replace the node tokens chained below the cake recipe token.
    if ($node_tokens = token_find_with_prefix($tokens, 'recipe')) {
      $node = node_load($cake->recipe_nid);
      $replacements += token_generate('node', $node_tokens, array('node' => $node), $options);
    }
  }
}
?>