header("HTTP/1.0 404 Not Found"); echo "404 Not Found"; exit();
use Symfony\Component\HttpFoundation\Response; $response = new Response('404 Not Found', 404); $response->send();
use GuzzleHttp\Client; use GuzzleHttp\Exception\RequestException; $client = new Client(); try { $response = $client->get('http://example.com/404'); } catch (RequestException $e) { echo $e->getMessage(); }In conclusion, the choice of package library for handling response errors in PHP depends on the project's requirements and the developer's preferences. Some popular package libraries for handling HTTP requests and responses in PHP include Guzzle, Symfony HTTP Foundation, and plain PHP.