OIDC claims example in PHP

$array = array(
  "id_token" => array(
    "auth_time" => array(
      "essential"=> true
    ),
    "acr" => array(
      "values" => ["urn:mace:incommon:iap:silver"]
    )
   )
);
              
$json = json_encode($array);
echo $json, PHP_EOL;
echo http_build_query(array("claims"=>$json)), PHP_EOL;