wdm

There is a kind-of workaround, by explicitly adding the query_vars from $_GET:

function parse_query_vars($query) {

  if ( isset($_GET['multi-cat']) ) {

    $query->query_vars['multi-cat'] = $_GET['multi-cat'];

    var_dump($query);

  }

}

The var_dump now reports:

["query_vars"]=>
  array(1) {
    ["multi-cat"]=>
    array(2) {
      [0]=>
      string(1) "6"
      [1]=>
      string(2) "10"
    }
  }

Unfortunately custom rewrite rules don’t seem to work with this method.

Here is the code:

function add_query_vars($query_vars) {
  $query_vars[] = 'multi-cat';
  return $query_vars;
}

With the url blog.com/?multi-cat[]=6&multi-cat[]=10

(GET vars come from a multiple category widget I’m working on, the selects are each named ‘multi-cat[]’ to create an array of category IDs).

function parse_query_vars($query) {
  var_dump($query);
}

The resulting var_dump shows the array is recognised, but cast to a string:

["query_vars"]=>
  array(1) {
    ["multi-cat"]=>
    string(5) "Array"
 }

It seems to be something to do with the manage_categories capability

Any news?

don’t forget to add commas – so the array in your wp-includes/js/tinymce/tiny_mce_config.php should end like:

‘old_cache_max’ => ‘1’, // number of cache files to keep
‘convert_urls’ => false,
‘relative_urls’ => true’

Hmm… it did work, but not anymore.
Seems not to work all the time, anyone know why?

You could try:
echo '<img src="' . wp_get_attachment_url($attachment->ID) . '"/>';

Why are there 3 functions for doing basically the same thing???

the_attachment_link
get_the_attachment_link
wp_get_attachment_url

Using “/.” (without quotes) as the category base should work