Composing PHP Applications with Middleware (PHP World 2016)

Transcript

1. Composing PHP Applications with Middleware
   Josh Butts
   PHP World 2016
   

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2. About Me
   • VP of Engineering, offers.com
   • Austin PHP Organizer
   • Play competitive Skee Ball
   • github.com/jimbojsb
   • @jimbojsb
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3. PSR-7
   Lets Start With
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4. What is PSR-7
   • FIG standard for HTTP messages
   • A collection of interfaces
   • By itself, has nothing specific to do with
   middleware
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5. Request - Historically
   • $_SERVER, $_GET, $_POST, etc
   • apache_request_headers()
   • php://input
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6. Response - Historically
   • header()
   • http_response_code()
   • header_list()
   • echo
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7. URI - Historically
   • parse_url()
   • parse_str()
   • http_build_query()
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8. DID WE END UP HERE?
   How in the hell
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9. PSR-7
   Enter
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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
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11. PSR-7 is a collection of Interfaces
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12. Concrete Implementations of PSR-7
    • Zend\Diactoros
    • GuzzleHTTP\Psr7
    • Slim\Http
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13. MIDDLEWARE
    I thought this talk was about
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14. What is middleware?
    • Turns a Request into a Response
    • Stackable
    • Reusable
    • Dispatachable
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15. PHP Copied This Trend
    • Node.js Connect
    • Ruby Rack
    • Python WSGI
    • Even StackPHP
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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
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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
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18. Pick a dispatcher
    • Zend-Stratagility
    • Relay
    • Radar
    • Slim v3
    • Zend Expressive
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19. Pick a PSR-7 Implementation
    • Do not write one
    • Unless you’re using Slim already just use
    Zend/Diactoros
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20. What does a middleware look like?
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    $middleware = function(
    \Psr\Http\Message\RequestInterface $request,
    \Psr\Http\Message\ResponseInterface $response,
    callable $next) {
    // do the actual stuff
    };
    

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21. It might also look like this
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    $middleware = function(
    \Psr\Http\Message\RequestInterface $request,
    callable $next) {
    // do some stuff
    };
    

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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
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23. LETS LOOK AT CODE
    All that’s fine
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24. QUESTIONS?
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25. GITHUB.COM/JIMBOJSB/
    MIDDLEWARE-TALK
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26. JOIND.IN/TALK/AF8F4
    I’d love your feedback
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