kdoole

This appears to work quite nicely.

Yep, understand that, but I have an array with about 40 elements (very rough guess) that tests against the user agent string. So instead of having to maintain a list of every conceivable user mobile agent string (there are many) to a user agent group, i’d like to be able to use a preg_match_all and just test for some key words in the string.

My guess would be:

w3tc_add_action('w3tc_pgcache_cache_key', 'modify_page_key');
function modify_page_key($key) {
    //if user agent matches any of the elements in the array of mobile-like user agent words, $key .= 'something_special';
}

I will give this a try now, but if you have a better solution, lay it on me! I think this should work though… right?

This works for me (inside functions.php):

add_action( 'do_meta_boxes', 'move_image_box' );
function move_image_box() {
	remove_meta_box( 'postimagediv', '[your_post_type]', 'side' );
	add_meta_box( 'postimagediv', __( 'Featured image' ), 'post_thumbnail_meta_box', '[your_post_type]', 'normal', 'high' );
}

See docs for add_meta_box for details on how to control where you place the meta box.