How to get a value-only flat array from $wpdb->get_results when selecting a single column, without foreach()?

My query is:

$  var = $  wpdb->get_results("SELECT field FROM {$  wpdb->prefix}table", ARRAY_A); var_dump($  var); 

it returns someting like array(2) { [0]=> array(1) { ["field"]=> string(5) "test1" } [1]=> array(1) { ["field"]=> string(t) "test2" }. I.e. each item is a row with a single name-value pair.

What I want is array(2) { [0]=> string(5) "test1" [1]=> string(5) "test2" }

Currently I achieve it like this:

$  var = $  wpdb->get_results("SELECT field FROM {$  wpdb->prefix}table"); foreach($  var as $  v_key => $  v_val) $  var[$  v_key] = $  v_val['field']; var_dump($  var); 

Is there a shorter way to do this?