Composing PHP Applications with Middleware (PHP World 2016)

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Composing PHP Applications with Middleware Josh Butts PHP World 2016

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About Me • VP of Engineering, offers.com • Austin PHP Organizer • Play competitive Skee Ball • github.com/jimbojsb • @jimbojsb 2

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PSR-7 Lets Start With 3

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What is PSR-7 • FIG standard for HTTP messages • A collection of interfaces • By itself, has nothing specific to do with middleware 4

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Request - Historically • $_SERVER, $_GET, $_POST, etc • apache_request_headers() • php://input 5

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Response - Historically • header() • http_response_code() • header_list() • echo 6

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URI - Historically • parse_url() • parse_str() • http_build_query() 7

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DID WE END UP HERE? How in the hell 8

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PSR-7 Enter 9

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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

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PSR-7 is a collection of Interfaces 11

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Concrete Implementations of PSR-7 • Zend\Diactoros • GuzzleHTTP\Psr7 • Slim\Http 12

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MIDDLEWARE I thought this talk was about 13

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What is middleware? • Turns a Request into a Response • Stackable • Reusable • Dispatachable 14

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PHP Copied This Trend • Node.js Connect • Ruby Rack • Python WSGI • Even StackPHP 15

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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

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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

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Pick a dispatcher • Zend-Stratagility • Relay • Radar • Slim v3 • Zend Expressive 18

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Pick a PSR-7 Implementation • Do not write one • Unless you’re using Slim already just use Zend/Diactoros 19

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What does a middleware look like? 20

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It might also look like this 21

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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