$args = array(
"numberposts" => -1,
'post_type' => 'page',
'meta_query' => array(
'relation' => 'OR',
array(
'key' => 'page_type',
'value' => 1,
'compare' => '='
),
array(
'key' => 'page_type',
'value' => 3,
'compare' => '='
)
)
);
$city_ids = get_posts($args);