Problem with trigger rule

In the trigger rule I have this code:

function _doxologia_replace_diacritics($str) {
  // s cu virgula este varianta corecta
  $from = explode(" ", html_entity_decode("Ş ş Ţ ţ",ENT_COMPAT,"UTF-8"));
  $to = explode(" ", html_entity_decode("Ș ș Ț ț",ENT_COMPAT,"UTF-8"));
  return str_replace($from, $to, $str);
}
$type_name = $node->type;
$type = content_types($type_name);
foreach ($type['fields'] as $field) {
   $val = $field['field_name'];
   $arr = array();
   $arr = $node->$val;
   $count = count($arr);
   for ($i = 0; $i < $count; $i++) {
      if (is_string($arr[$i ]['value'])) $arr[$i ]['value'] = _doxologia_replace_diacritics($arr[$i ]['value']);
      if (is_string($arr[$i ]['title']))  $arr[$i ]['title'] = _doxologia_replace_diacritics($arr[$i ]['title']);
   }
   $node->$val = $arr;
}

$node->body = _doxologia_replace_diacritics($node->body);
$node->taxonomy['tags'][2] = _doxologia_replace_diacritics($node->taxonomy['tags'][2]);
$node->title = _doxologia_replace_diacritics($node->title);
$node->teaser = _doxologia_replace_diacritics($node->teaser);
$node->comment = _doxologia_replace_diacritics($node->comment);


return array("node" => $node);

As a condition I have

return $node->language == 'ro';

In another module I try to generate some nodes by node_submit and node_save.


.....
$node1 = (object)$node1;
$node1 = node_submit($node1);
node_save($node1);
$node2 = (object)$node2;
$node2 = node_submit($node);
node_save($node2);
......


The first node is saved, but for the second it appears this error:
"Fatal error: Cannot redeclare _doxologia_replace_diacritics().

Probably I have to move the declaration of the function in another file, but I don't understand why it saw the same declaration if it is about another array node on the save.

Yes, the problem is solved if I'll move the function in another file.
Thanks