Only get post_id [duplicate]

Quick shot:

$countries = get_pages(array(
    "hierarchical" => 0, 
    "sort_column"  => "menu_order", 
    "sort_order"   => "desc", 
    "meta_key"     => "page_type", 
    "meta_value"   => 2,
));
$page_ids = array();
foreach ( $countries as $country ) {
    $page_ids[] = $country->ID;
}

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