Composing PHP Applications with Middleware (PHP World 2016)

Transcript

1. Composing PHP Applications with Middleware Josh Butts PHP World 2016
2. About Me • VP of Engineering, offers.com • Austin PHP Organizer • Play competitive Skee Ball • github.com/jimbojsb • @jimbojsb 2
3. PSR-7 Lets Start With 3
4. What is PSR-7 • FIG standard for HTTP messages • A collection of interfaces • By itself, has nothing specific to do with middleware 4
5. Request - Historically • $_SERVER, $_GET, $_POST, etc • apache_request_headers() • php://input 5
6. Response - Historically • header() • http_response_code() • header_list() • echo 6
7. URI - Historically • parse_url() • parse_str() • http_build_query() 7
8. DID WE END UP HERE? How in the hell 8
9. PSR-7 Enter 9
10. But first - More History • 2014 - everyone* has gone out and built and object model of HTTP • Hello World for writing a framework • None of them are compatible • Symfony\HttpFoundation widely used 10
11. PSR-7 is a collection of Interfaces 11
12. Concrete Implementations of PSR-7 • Zend\Diactoros • GuzzleHTTP\Psr7 • Slim\Http 12
13. MIDDLEWARE I thought this talk was about 13
14. What is middleware? • Turns a Request into a Response • Stackable • Reusable • Dispatachable 14
15. PHP Copied This Trend • Node.js Connect • Ruby Rack • Python WSGI • Even StackPHP 15
16. Express.js is getting it right • All middleware all the way down • Even error handlers are middleware • Even the app instance itself is middleware 16
17. Components of a PHP Middleware App • PSR-7 implementation • Collection of middleware • Middleware dispatcher • Any other libraries that will actually do business logic for you 17
18. Pick a dispatcher • Zend-Stratagility • Relay • Radar • Slim v3 • Zend Expressive 18
19. Pick a PSR-7 Implementation • Do not write one • Unless you’re using Slim already just use Zend/Diactoros 19
20. What does a middleware look like? 20 <?php $middleware = function( \Psr\Http\Message\RequestInterface $request, \Psr\Http\Message\ResponseInterface $response, callable $next) { // do the actual stuff };
21. It might also look like this 21 <?php $middleware = function( \Psr\Http\Message\RequestInterface $request, callable $next) { // do some stuff };
22. PSR-15 • There is still some debate as to which is better • It’s likely the standard will not pass along the response • Lots of existing middleware out there that would not meet this spec 22
23. LETS LOOK AT CODE All that’s fine 23
24. QUESTIONS? 24
25. GITHUB.COM/JIMBOJSB/ MIDDLEWARE-TALK 25
26. JOIND.IN/TALK/AF8F4 I’d love your feedback 26