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@bicpi Symfony – In Plain English Philipp Rieber #DCMuc16

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#DCMuc16

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#DCMuc16

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@bicpi PHP・Symfony・DevOps・Technical Writer https://philipp-rieber.net #DCMuc16

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@bicpi PHP・Symfony・DevOps・Technical Writer https://philipp-rieber.net #DCMuc16

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ottonova.de We are creating a better private health insurance company for you. #DCMuc16

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@sfugmuc Symfony User Group Munich #DCMuc16

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First, Symfony2 is a reusable set of standalone, decoupled, and cohesive PHP components that solve common web development problems. – Fabien Potencier ‘ http://fabien.potencier.org/what-is-symfony2.html What is Symfony? #DCMuc16

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BrowserKit ClassLoader Config Asset Console CssSelector Debug DependencyInjection DomCrawler EventDispatcher ExpressionLanguage Filesystem Finder Form Guard HttpFoundation HttpKernel Icu Intl Ldap Locale OptionsResolver Process PropertyAccess PropertyInfo Routing Security Serializer Stopwatch Templating Translation Validator VarDumper Yaml Guard Workflow #DCMuc16

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BrowserKit ClassLoader Config Asset Console CssSelector Debug DependencyInjection DomCrawler EventDispatcher ExpressionLanguage Filesystem Finder Form Guard HttpFoundation HttpKernel Icu Intl Ldap Locale OptionsResolver Process PropertyAccess PropertyInfo Routing Security Serializer Stopwatch Templating Translation Validator VarDumper Yaml Guard Workflow #DCMuc16

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$ composer require symfony/yaml Yaml Component #DCMuc16

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$ composer require symfony/yaml require 'vendor/autoload.php'; Yaml Component #DCMuc16

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$ composer require symfony/yaml require 'vendor/autoload.php'; use Symfony\Component\Yaml\Yaml; Yaml Component #DCMuc16

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$ composer require symfony/yaml require 'vendor/autoload.php'; use Symfony\Component\Yaml\Yaml; $yaml = <<

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$ composer require symfony/yaml require 'vendor/autoload.php'; use Symfony\Component\Yaml\Yaml; $yaml = <<

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$ composer require symfony/yaml require 'vendor/autoload.php'; use Symfony\Component\Yaml\Yaml; $yaml = << ['user' => 'symfony', 'pass' => 'awesome']] Yaml Component #DCMuc16

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BrowserKit ClassLoader Config Asset Console CssSelector Debug DependencyInjection DomCrawler EventDispatcher ExpressionLanguage Filesystem Finder Form Guard HttpFoundation HttpKernel Icu Intl Ldap Locale OptionsResolver Process PropertyAccess PropertyInfo Routing Security Serializer Stopwatch Templating Translation Validator VarDumper Yaml Guard Workflow #DCMuc16

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$ composer require symfony/finder Finder Component #DCMuc16

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$ composer require symfony/finder Finder Component require 'vendor/autoload.php'; use Symfony\Component\Finder\Finder; #DCMuc16

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$ composer require symfony/finder Finder Component require 'vendor/autoload.php'; use Symfony\Component\Finder\Finder; $finder = Finder::create(); #DCMuc16

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$ composer require symfony/finder Finder Component require 'vendor/autoload.php'; use Symfony\Component\Finder\Finder; $finder = Finder::create() ->in('/Users/bicpi/photos');
 #DCMuc16

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$ composer require symfony/finder Finder Component require 'vendor/autoload.php'; use Symfony\Component\Finder\Finder; $finder = Finder::create() ->in('/Users/bicpi/photos') ->files();
 #DCMuc16

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$ composer require symfony/finder Finder Component require 'vendor/autoload.php'; use Symfony\Component\Finder\Finder; $finder = Finder::create() ->in('/Users/bicpi/photos') ->files() ->name('*.jpg');
 #DCMuc16

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$ composer require symfony/finder Finder Component require 'vendor/autoload.php'; use Symfony\Component\Finder\Finder; $finder = Finder::create() ->in('/Users/bicpi/photos') ->files() ->name('*.jpg') ->size('>= 1M'); #DCMuc16

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$ composer require symfony/finder Finder Component require 'vendor/autoload.php'; use Symfony\Component\Finder\Finder; $finder = Finder::create() ->in('/Users/bicpi/photos') ->files() ->name('*.jpg') ->size('>= 1M'); foreach ($finder as $file) { echo $file->getFilename() . "\n"; } #DCMuc16

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Do one thing. 
 Make it excellent. 
 Stay out of the way. – Unix Philosophy ‘ #DCMuc16

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• … • Console Command Line Interface • Filesystem Basic utilities for the filesystem • Translation Tools for internationalisation • … #DCMuc16

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Then, based on these components, Symfony2 is also a full-stack web framework. – Fabien Potencier ‘ http://fabien.potencier.org/what-is-symfony2.html What ELSE is Symfony? #DCMuc16

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BrowserKit ClassLoader Config Asset Console CssSelector Debug DependencyInjection DomCrawler EventDispatcher ExpressionLanguage Filesystem Finder Form Guard HttpFoundation HttpKernel Icu Intl Ldap Locale OptionsResolver Process PropertyAccess PropertyInfo Routing Security Serializer Stopwatch Templating Translation Validator VarDumper Yaml Guard Workflow Your Application #DCMuc16

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☺ #DCMuc16

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Request ☺ 1 #DCMuc16

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Request ☺ Response 2 1 #DCMuc16 ?

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Request ☺ Response 2 3 #DCMuc16 1 ?

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Request ☺ Symfony full-stack Response #DCMuc16 1 2 3

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It is all about transforming a Request into a Response #DCMuc16

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HttpFoundation\Request
 HTTP Header, $_GET, $_POST, $_COOKIE, $_SESSION, $_SERVER
 #DCMuc16

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HttpFoundation\Request
 HTTP Header, $_GET, $_POST, $_COOKIE, $_SESSION, $_SERVER
 HttpKernel
 Web framework core, “Glues” the components,
 Loads configuration and “Bundles”, Controls flow, Event Driven #DCMuc16

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HttpFoundation\Request
 HTTP Header, $_GET, $_POST, $_COOKIE, $_SESSION, $_SERVER
 HttpFoundation\Response
 HTTP Status Code, HTTP Header, Content (HTML, JSON …) HttpKernel
 Web framework core, “Glues” the components,
 Loads configuration and “Bundles”, Controls flow, Event Driven #DCMuc16

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HTTP specification #DCMuc16

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#DCMuc16 Code please.

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Request
 /blog/article?id=34 #DCMuc16

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Request
 /blog/article?id=34 class BlogController extends Controller { 
 
 
 
 
 
 
 } #DCMuc16

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Request
 /blog/article?id=34 class BlogController extends Controller { /** * @Route("/blog/article") */ public function articleAction(Request $request) { 
 
 
 
 
 
 
 } } #DCMuc16

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Request
 /blog/article?id=34 class BlogController extends Controller { /** * @Route("/blog/article") */ public function articleAction(Request $request) { 
 
 
 
 
 
 
 } } #DCMuc16

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Request
 /blog/article?id=34 class BlogController extends Controller { /** * @Route("/blog/article") */ public function articleAction(Request $request) { $id = $request->query->get('id'); 
 
 
 
 
 
 } } #DCMuc16

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Request
 /blog/article?id=34 class BlogController extends Controller { /** * @Route("/blog/article") */ public function articleAction(Request $request) { $id = $request->query->get('id'); $article = $database->findArticle($id); 
 
 
 
 
 } } #DCMuc16

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Request
 /blog/article?id=34 class BlogController extends Controller { /** * @Route("/blog/article") */ public function articleAction(Request $request) { $id = $request->query->get('id'); $article = $database->findArticle($id); if (!$article) { return new Response('Article not found.', 404); } 
 
 
 } } #DCMuc16

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Request
 /blog/article?id=34 class BlogController extends Controller { /** * @Route("/blog/article") */ public function articleAction(Request $request) { $id = $request->query->get('id'); $article = $database->findArticle($id); if (!$article) { return new Response('Article not found.', 404); } 
 
 
 } } #DCMuc16 Response 404
 Article not found

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Request
 /blog/article?id=34 class BlogController extends Controller { /** * @Route("/blog/article") */ public function articleAction(Request $request) { $id = $request->query->get('id'); $article = $database->findArticle($id); if (!$article) { return new Response('Article not found.', 404); } $html = $view->renderArticle($article); } } #DCMuc16

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Request
 /blog/article?id=34 class BlogController extends Controller { /** * @Route("/blog/article") */ public function articleAction(Request $request) { $id = $request->query->get('id'); $article = $database->findArticle($id); if (!$article) { return new Response('Article not found.', 404); } $html = $view->renderArticle($article); return new Response($html, 200); } } #DCMuc16 Response 200
 Article 34

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During the Request ➾ Response flow,
 many more components will assist #DCMuc16

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• Routing Match URL to controller action • Templating Render templates • Security Decide about access • Config Load configuration • Forms Create HTML forms • … #DCMuc16

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Who is going to configure all this?

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Symfony Configuration #DCMuc16

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Symfony Configuration dev prod test #DCMuc16

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Symfony Configuration dev /app_dev.php/articles /app.php/articles prod test UseCaseTest #DCMuc16

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Front Controller Symfony Configuration dev /app_dev.php/articles /app.php/articles prod test UseCaseTest #DCMuc16

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Symfony Configuration dev /app_dev.php/articles /app.php/articles prod test UseCaseTest Test class #DCMuc16

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Symfony Configuration dev /app_dev.php/articles /app.php/articles new AppKernel('prod', false); new AppKernel('dev', true); new AppKernel('test', false); prod test UseCaseTest #DCMuc16

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Symfony Configuration dev /app_dev.php/articles /app.php/articles new AppKernel('prod', false); new AppKernel('dev', true); new AppKernel('test', false); config_prod.yml config_test.yml config_dev.yml prod test UseCaseTest #DCMuc16

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Symfony Configuration dev /app_dev.php/articles /app.php/articles new AppKernel('prod', false); new AppKernel('dev', true); new AppKernel('test', false); config_prod.yml config_test.yml config_dev.yml prod test config.yml UseCaseTest #DCMuc16

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database:
 driver: pdo_mysql
 charset: utf8
 
 
 
 # … config.yml #DCMuc16

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 database:
 driver: pdo_mysql
 charset: utf8
 user: '%db_user%' password: '%db_password%'
 
 # … config.yml #DCMuc16

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imports: - { resource: parameters.yml } database:
 driver: pdo_mysql
 charset: utf8
 user: '%db_user%' password: '%db_password%'
 
 # … config.yml #DCMuc16

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imports: - { resource: parameters.yml } database:
 driver: pdo_mysql
 charset: utf8
 user: '%db_user%' password: '%db_password%'
 
 # … config.yml parameters.yml parameters:
 
 
 
 
 
 #DCMuc16

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imports: - { resource: parameters.yml } database:
 driver: pdo_mysql
 charset: utf8
 user: '%db_user%' password: '%db_password%'
 
 # … config.yml parameters.yml parameters:
 
 
 
 
 
 added to .gitgnore #DCMuc16

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imports: - { resource: parameters.yml } database:
 driver: pdo_mysql
 charset: utf8
 user: '%db_user%' password: '%db_password%'
 
 # … config.yml parameters.yml parameters:
 
 
 
 
 
 db_user: drupal db_password: ThisIsSuperS3cr3t
 
 # … added to .gitgnore #DCMuc16

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Dependency Injection #DCMuc16

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Logger Beispiel /** * @Route("/weather/at/{zip}") */ public function weatherAction(string $zip) { } #DCMuc16

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Logger Beispiel /** * @Route("/weather/at/{zip}") */ public function weatherAction(string $zip) { // ...
 // ... Do heavy stuff to calculate $weatherData from $zip ... // ...
 $theWeather = $this->render('weather.html.twig', $weatherData); return new Response($theWeather, 200)); } #DCMuc16 Lots of stuff happens here to prepare the weather data

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Logger Beispiel Let’s extract this to an independent service class! class WeatherForecast { public function forZip(string $zip): array { // ... // ... Do heavy stuff to calculate $weatherData from $zip ...
 // ... return $weatherData; } } #DCMuc16

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Logger Beispiel class WeatherForecast { public function forZip(string $zip): array { // ... // ... Do heavy stuff to calculate $weatherData from $zip ...
 // ... return $weatherData; } } #DCMuc16 It only does ONE thing!

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Logger Beispiel /** * @Route("/weather/at/{zip}") */ public function weatherAction(string $zip) { $weatherForecast = new WeatherForecast(); $weatherData = $weatherForecast->forZip($zip); $theWeather = $this->render('weather.html.twig', $weatherData); return new Response($theWeather, 200)); } Then use the service from the controller! #DCMuc16

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Logger Beispiel class WeatherForecast { public function forZip(string $zip): array { $logger = new FileLogger('/var/log/weather.log'); // ... // ... Things might go wrong ...
 $logger->notice('No forecast found for ZIP '.$zip);
 // ... Things might work
 $logger->info('Forecast provided for ZIP '.$zip); // ... return $weatherData; } } But now imagine a dependency to a Logger service #DCMuc16

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Logger Beispiel class WeatherForecast { public function forZip(string $zip): array { $logger = new FileLogger('/var/log/weather.log'); // ... // ... Things might go wrong ...
 $logger->notice('No forecast found for ZIP '.$zip);
 // ... Things might work
 $logger->info('Forecast provided for ZIP '.$zip); // ... return $weatherData; } } But now imagine a dependency to a Logger service #DCMuc16 • How to test this code? • How to switch the log file? • How to use a different logger?

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Logger Beispiel class WeatherForecast
 { private $logger; public function __construct($logger)
 { $this->logger = $logger; } public function forZip(string $zip): array 
 { // ... $this->logger->info('Forecast provided for ZIP '.$zip); // ... } } Why not inject the logger dependency? #DCMuc16

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Logger Beispiel class WeatherForecast
 { private $logger; public function __construct(Psr\Log\LoggerInterface $logger)
 { $this->logger = $logger; } public function forZip(string $zip): array 
 { // ... $this->logger->info('Forecast provided for ZIP '.$zip); // ... } } And type hint it against an interface contract? #DCMuc16

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Logger Beispiel class FileLogger implements Psr\Log\LoggerInterface
 {
 
 private $logFilePath; public function __construct(string $logFilePath)
 { $this->logFilePath = $logFilePath; } public function notice($message) { … }
 public function info($message) { … }
 
 … } #DCMuc16

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Logger Beispiel /** * @Route("/weather/at/{zip}") */ public function weatherAction(string $zip) { $logger = new FileLogger('/var/log/weather.log');
 $weatherForecast = new WeatherForecast($logger);
 // ... } Inject the logger dependency into the constructor #DCMuc16

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#DCMuc16 Service Container

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services:
 config.yml #DCMuc16 Now shift the service creation to a service container

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services:
 logger:
 class: FileLogger
 
 
 
 config.yml #DCMuc16

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services:
 logger:
 class: FileLogger
 arguments:
 - '/var/log/weather.log' 
 
 
 config.yml #DCMuc16

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services:
 logger:
 class: FileLogger
 arguments:
 - '/var/log/weather.log' weather_forecast:
 class: WeatherForecast
 config.yml #DCMuc16

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services:
 logger:
 class: FileLogger
 arguments:
 - '/var/log/weather.log' weather_forecast:
 class: WeatherForecast
 arguments:
 - '@logger' config.yml #DCMuc16

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/** * @Route("/weather/at/{zip}") */ public function weatherAction(string $zip) { $weatherForecast = $this->container->get('...'); $weatherData = $weatherForecast->forZip($zip); $theWeather = $this->render('weather.html.twig', $weatherData); return new Response($theWeather, 200)); } #DCMuc16

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/** * @Route("/weather/at/{zip}") */ public function weatherAction(string $zip) { $weatherForecast = $this->container->get('weather_forecast'); $weatherData = $weatherForecast->forZip($zip); $theWeather = $this->render('weather.html.twig', $weatherData); return new Response($theWeather, 200)); } #DCMuc16

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config.yml #DCMuc16 services:
 logger:
 class: NullLogger weather_forecast:
 class: WeatherForecast
 arguments:
 - '@logger'
 


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config.yml #DCMuc16 services:
 logger:
 class: DatabaseLogger weather_forecast:
 class: WeatherForecast
 arguments:
 - '@logger'
 


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#DCMuc16 Console

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File upload script with some flags, options and arguments #DCMuc16 $ ./upload-files --overwrite cat-1.jpg cat-2.jpg cat-3.jpg 


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File upload script with some flags, options and arguments #DCMuc16 $ ./upload-files --overwrite cat-1.jpg cat-2.jpg cat-3.jpg 
 Uploading 'cat-1.jpg' ...


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File upload script with some flags, options and arguments #DCMuc16 $ ./upload-files --overwrite cat-1.jpg cat-2.jpg cat-3.jpg 
 Uploading 'cat-1.jpg' ...
 Uploading 'cat-2.jpg' ...


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File upload script with some flags, options and arguments #DCMuc16 $ ./upload-files --overwrite cat-1.jpg cat-2.jpg cat-3.jpg 
 Uploading 'cat-1.jpg' ...
 Uploading 'cat-2.jpg' ...
 Uploading 'cat-3.jpg' ...

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#DCMuc16 Now we gonna tackle $_SERVER['argv'] !

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use Symfony\Component\Console\Command\Command; 
 class UploadFilesCommand extends Command { } #DCMuc16 #DCMuc16

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use Symfony\Component\Console\Command\Command; 
 class UploadFilesCommand extends Command { protected function configure() { // ... } } #DCMuc16

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use Symfony\Component\Console\Command\Command; use Symfony\Component\Console\Input\InputInterface; use Symfony\Component\Console\Output\OutputInterface; class UploadFilesCommand extends Command { protected function configure() { // ... } protected function execute(InputInterface $input, OutputInterface $output) { // ... } } #DCMuc16

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class UploadFilesCommand extends Command { protected function configure() { 
 } protected function execute(InputInterface $input, OutputInterface $output) { } } #DCMuc16

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class UploadFilesCommand extends Command { protected function configure() { $this
 ->setName('upload-files');
 } protected function execute(InputInterface $input, OutputInterface $output) { } } #DCMuc16

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class UploadFilesCommand extends Command { protected function configure() { $this
 ->setName('upload-files') ->addOption('overwrite', 'o', InputOption:: VALUE_NONE, 'Overwrite files?'); } protected function execute(InputInterface $input, OutputInterface $output) { } } #DCMuc16

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class UploadFilesCommand extends Command { protected function configure() { $this ->setName('upload-files') ->addOption('overwrite', 'o', InputOption:: VALUE_NONE, 'Overwrite files?') ->addArgument('filePaths', InputArgument::IS_ARRAY, 'Files to upload?'); } protected function execute(InputInterface $input, OutputInterface $output) { 
 } } #DCMuc16

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class UploadFilesCommand extends Command { protected function configure() { $this
 ->setName('upload-files') ->addOption('overwrite', 'o', InputOption:: VALUE_NONE, 'Overwrite files?') ->addArgument('filePaths', InputArgument::IS_ARRAY, 'Files to upload?'); } protected function execute(InputInterface $input, OutputInterface $output) { } } #DCMuc16

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class UploadFilesCommand extends Command { protected function configure() { $this
 ->setName('upload-files') ->addOption('overwrite', 'o', InputOption:: VALUE_NONE, 'Overwrite files?') ->addArgument('filePaths', InputArgument::IS_ARRAY, 'Files to upload?'); } protected function execute(InputInterface $input, OutputInterface $output) { $overwrite = $input->hasOption('overwrite'); } } #DCMuc16

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class UploadFilesCommand extends Command { protected function configure() { $this
 ->setName('upload-files') ->addOption('overwrite', 'o', InputOption:: VALUE_NONE, 'Overwrite files?') ->addArgument('filePaths', InputArgument::IS_ARRAY, 'Files to upload?'); } protected function execute(InputInterface $input, OutputInterface $output) { $overwrite = $input->hasOption('overwrite'); foreach ($input->getArgument('filePaths') as $path) { } } } #DCMuc16

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class UploadFilesCommand extends Command { protected function configure() { $this
 ->setName('upload-files') ->addOption('overwrite', 'o', InputOption:: VALUE_NONE, 'Overwrite files?') ->addArgument('filePaths', InputArgument::IS_ARRAY, 'Files to upload?'); } protected function execute(InputInterface $input, OutputInterface $output) { $overwrite = $input->hasOption('overwrite'); foreach ($input->getArgument('filePaths') as $path) { $output->writeLn("Uploading '{$path}' ... "); // ... do the upload depending on $overwrite } } } #DCMuc16

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Anything else? #DCMuc16

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Bundles • ~ PlugIns, but even better • Everything in Symfony Full-Stack is a Bundle • Yes, Symfony Full-Stack itself is a Bundle • Core and custom code is in Bundles • Registered in HttpKernel #DCMuc16

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• PSR – PHP Standards Recommendations • HTTP Specification Symfony ♥ Standards #DCMuc16

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• Git & GitHub • Semantic Versioning – Breaking.Feature.Fix • Dependency Injection • Event Driven • Popularize ORMs • New level of code quality and architecture • Command Line Tools Symfony drives Innovation … just to name a few (in the PHP world, at least …) #DCMuc16

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• Twig • Composer • Monolog • Swiftmailer • Silex • PHP CS Fixer
 … Symfony “by-products” #DCMuc16

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• Outstanding Documentation • Huge ecosystem of 3rd-party bundles • Creates many “celebrities” • Conferences • Certification Symfony’s Community (and SensioLabs) #DCMuc16

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Evolution, not Revolution Symfony 3 #DCMuc16

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@bicpi Questions? https://philipp-rieber.net #DCMuc16

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Links • http://symfony.com/ • https://github.com/symfony • http://fabien.potencier.org/what-is-symfony2.html • http://symfony.com/doc/current/create_framework • http://www.php-fig.org/ #DCMuc16