htmlspecialchars() expects parameter 1 to be string, array given in ...includes/bootstrap.inc on line 857

I was afraid this might be the case. We have a custom module that was built for d5 and re-written for d6 that might be the culprit? The (potentially?) relevant snippet is this:

/**
 * Implementation of hook_views_query_alter().
 *
 * For the n2_projects view, intercept the query string and offer
 * custom sort.  The query string argument has a special format, as seen
 * in the sort_type options.
 */
function net2helper_views_query_alter(&$view, &$query) {
  // ross added test_n2_projects to if statement.
  if ($view->name == 'n2_projects' || $view->name == 'test_n2_projects' ||
  $view->name == 'n2_projects_v2') {
    global $_GET;
    //dsm($_GET);
    if (!empty($_GET['sort_type'])) {
      $sort = check_plain($_GET['sort_type']);
      list($sort_label, $sort_order) = str_split($sort, strrpos($sort, '_'));
      $sort_order = substr($sort_order, 1); // Strip off leading underscore
      $query->orderby = array($sort_label .' '. strtoupper($sort_order));
    }
  }
}

...which have to do with radio-button sort options that appear as filters at the top of the view. Could this be creating the issue, or when you say that there is an array being sent as a string, are you talking about something more native to the view itself like the template? I am just trying to troubleshoot, and am not sure if I am understanding your comments below.

Thanks for your very quick response. Your module is so CORE to the drupal platform (hint, hint) and I very much appreciate your responding so quickly.

ps. for that view, there are no explicite arguments defined by the view itself (at least not that are visible through the views UI).

In two places, the template calls views_embed_view:

1.

     <?php $cidelement = '<div class="tab-discussion">'; ?>
     <?php if ($id == 'nid_1') : ?>
         <?php print "</div>" .$cidelement;  ?>
         <?php print views_embed_view('project_comments', 'page_1', array($field->content)); ?>
         
     <?php endif; ?>
            <?php endforeach; ?>

2.

            <?php if ($id == 'created' || $id == 'field_project_uri_url_1'
|| $id == 'view_node' || $id == 'tid' || $id == 'field_project_goals_value' || 
$id == 'field_project_expertise_value'): ?>
            <?php if ($id == 'view_node'): ?>
                <?php $created = 0; ?>
                <?php print '<div class="links-block-wrapper">'; ?>
                <?php print views_embed_view('project_comments', 'attachment_2', array($fields['nid_1']->content)); /* Here we embed links box. */ ?>
                <?php print '</div>'; ?>

            <?php endif; ?>

Does this help? I (and hopefully others) am gaining from this discussion. Thanks.

(the code above is from the tpl.php file that i have attached to this ticket, if you would like the see it in it's larger context)

THANK YOU.

This worked, but I just want to be clear (for n00bs like myself) because there are two ways to translate the above:

1. <?php print views_embed_view('project_comments', 'attachment_2', $fields['nid_1']->content);
2. <?php print views_embed_view('project_comments', 'attachment_2');

The FIRST is GOOD.
The second will fail. It will not display the right values.

In any case, merlinofchaos, you have saved my day. I very much appreciate this lesson, as I hope do others. I know that you are busy, and I appreciate your time and your care.

Thanks.