I'm trying to select posts without a particular custom field. Some posts will have it, some won't, I want to grab just the ones that do not have it.
Something like this:
$args = array( 'meta_query' => array( array( 'key' => '$customfield', 'value' => NULL, 'compare' => '=' ) ) );
But not that, as that doesn't work.
Anyone have any ideas?