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