กระบวนการทำงาน หรือ Life Cycle ของ Slim Framework

<?php
use Psr\Http\Message\ResponseInterface as Response;
use Psr\Http\Message\ServerRequestInterface as Request;
use Slim\Factory\AppFactory;

require './vendor/autoload.php';

// กำหนด slim instance app
$app = AppFactory::create();
// กำหนด path
$app->setBasePath('/demo/api');

// กำหนดการจัดการเกี่่ยวกับ error
$app->addErrorMiddleware(false, true, true);

// กำหนด Routing
$app->get('/', function (Request $request, Response $response, $args) {
    $response->getBody()->write("Hello world!");
    return $response;
});

$app->get('/home', function (Request $request, Response $response, $args) {
    $response->getBody()->write("Welcome!");
    return $response;
});

$app->run();

$app = AppFactory::create();

// กำหนด Routing
$app->get('/', function (Request $request, Response $response, $args) {
    $response->getBody()->write("Hello world!");
    return $response;
});

$app->get('/home', function (Request $request, Response $response, $args) {
    $response->getBody()->write("Welcome!");
    return $response;
});

// middleware ตัวที่เพิ่มก่อน จะเป็นตัวในสุด
$app->add(function (Request $request, RequestHandler $handler) use ($app) {
    echo "B";
    $response = $handler->handle($request);
    $existingContent = (string) $response->getBody();

    $response = $app->getResponseFactory()->createResponse();
    $response->getBody()->write('BEFORE ' . $existingContent);
    echo "BB";
    return $response;
});

// middleware ตัวที่เพิ่มต่อมา จะเป็นตัวล้อมออกมาวงนอกไปเรื่อยๆ
$app->add(function (Request $request, RequestHandler $handler) {
    echo "C";
    $response = $handler->handle($request);
    $response->getBody()->write(' AFTER');
    echo "CC";
    return $response;
});

// ตัว route เป็น slim app อยู่ด้านในตรงกลาง
$app->get('/', function (Request $request, Response $response, $args) {
    echo "A";
    $response->getBody()->write('Hello World');
    echo "AA";
    return $response;
});

$app->get('/json', function (Request $request, Response $response, array $args) {
    $payload = json_encode(['hello' => 'world'], JSON_PRETTY_PRINT);
    $response->getBody()->write($payload);
    return $response->withHeader('Content-Type', 'application/json');
});

$app->get('/json', function (Request $request, Response $response, array $args) use ($app) {
    $responseNew = $app->getResponseFactory()->createResponse();
});

withProtocolVersion($version)
withHeader($name, $value)
withAddedHeader($name, $value)
withoutHeader($name)
withBody(StreamInterface $body)

withMethod($method)
withUri(UriInterface $uri, $preserveHost = false)
withCookieParams(array $cookies)
withQueryParams(array $query)
withUploadedFiles(array $uploadedFiles)
withParsedBody($data)
withAttribute($name, $value)
withoutAttribute($name)

withStatus($code, $reasonPhrase = '')