1$q = new WP_Query(
2 array(
3 'meta_key' => 'population', //setting the meta_key which will be used to order
4 'orderby' => 'meta_value', //if the meta_key (population) is numeric use meta_value_num instead
5 'order' => 'DESC', //setting order direction
6 'meta_query' => array(
7 'relation' => 'AND', //setting relation between queries group
8 array(
9 'relation' => 'OR', //setting relation between this inside query
10 array(
11 'key' => 'state',
12 'value' => 'Wisconsin',
13 ),
14 array(
15 'key' => 'timezone',
16 'value' => 'central',
17 )
18 ),
19 array(
20 'key' => 'city',
21 'compare' => 'EXISTS',
22 )
23 )
24 )
25);
26