The Wonderful World of Symfony Components

The Wonderful World of the Symfony Components

by your friend:

Ryan Weaver@weaverryan

Friday, September 28, 12

Who is this dude?

• That “Docs” guy

• KnpLabs US - Symfony consulting, training, Kumbaya

• Writer for KnpUniversity.comscreencasts

• Husband of the much more talented @leannapelham

knplabs.comgithub.com/weaverryan@weaverryan


http://www.knplabs.com/en

http://www.knplabs.com/en

http://www.github.com/weaverryan

http://www.github.com/weaverryan

Intro

Life before components(The Desert of the Real)


Symfony consists of 23 individual components


Components are available via Composer


Snooze...


Who Cares?


We Suck at Sharingand that sucks for you

@weaverryan

1


Including External Libraries is Depressing


The Big Bummer :(

@weaverryan

• How do I autoload their files?

• Does their library depend on anything else?

• How do I even store their files in my project?


Include a Zend Framework 1 component in symfony1



manually download the library and commit it

into your project


if you don’t want the WHOLE library, carefully delete everything except the dependent components


autoloading is completely custom ... blah gross!


Components are the key to mastering your framework

@weaverryan

2


If PHP is big, we’ll thriveIf PHP is small, we’ll die

@weaverryan

3


Communities

@weaverryan

PHP is Huge! Right?

http://www.flickr.com/photos/kitty-kat/




@weaverryan

PHP > Ruby


Fragmentation

@weaverryan

But fragmentation makes us tiny, isolated, and misguided trend-setters

http://www.flickr.com/photos/slpunk99/7329609744


http://www.flickr.com/photos/slpunk99/7329609744/sizes/h/

http://www.flickr.com/photos/slpunk99/7329609744/sizes/h/

PHP frameworks < Rails

@weaverryanFriday, September 28, 12

I don’t want a damned CakePHP Plugin!

@weaverryan

CakePHP

CodeIgniter


Fragmentation

@weaverryan

• More information we have to know

• Difficult to hire

• Disjointed forums, StackOverflow

• Interoperability? What’s that?


Components are shareable across all of PHP


Act 1

Making Sharing Sexy


PHP Framework Interoperability Group

http://www.php-fig.org/




The United Nations of PHP


(A)

The Problem of Autoloading


My Autoloader doesn’t like your PHPs

@weaverryan

• The symfony1 autoloader doesn’t know where ZF1 classes live. The Zf1 autoloader doesn’t know where symfony1 classes live

• Each library has its own autoloader that you must discover, configure and use


like a town where every store has its own currency


From The Mountain:PSR-0 Class Naming Conventions

@weaverryan

“Thou shalt name your classes by

following a predictable pattern”


class:sfRequest

path:lib/vendor/symfony/???idk


class:Symfony\Component\HttpFoundation\Request

path:vendor/symfony/src/Symfony/Component/HttpFoundation/Request.php


use Symfony\Component\ClassLoader\UniversalClassLoader;

$loader = new UniversalClassLoader();$loader->registerNamespaces(array( 'Zend' => __DIR__.'/path/to/zf'));

$loader->register();


(B)

Managing Vendors in your project


Composer


{ "require": { "zendframework/ldap": "2.0.x-dev" }}

1) Composer.json


$ curl -s https://getcomposer.org/installer | php

$ php composer.phar install

2) Composer.phar


https://getcomposer.org/installer

https://getcomposer.org/installer

require 'vendor/autoload.php';

use Zend\Ldap\Ldap;

$options = array(...);$ldap = new Ldap($options);

3) Use It



Act 2

Your friendly, neighborhood Symfony Components


The Symfony Components• HttpFoundation• HttpKernel• Event Dispatcher• Routing• CSSSelector• DomCrawler• BrowserKit• Config• Yaml• DependencyInjection• Security

@weaverryan

• OptionsResolver• Console• Filesystem• Finder• Locale• Process• Serializer• Templating• Form• Translation• Validator



@weaverryan


The “Framework” Components


Level 1

HttpFoundationsymfony/http-foundation


@weaverryan

{ "require": { "symfony/http-foundation": "2.1.x-dev" }}

php composer.phar install

<?php// your app


1

2

3

Fun to Install!


@weaverryan

Request/foo

Response<h1>Hi!</h1>

?

?

?

? ?

?

MysteryPHP Code


The Request


GET /foo?p=v1 HTTP/1.1Host: knplabs.comAccept: text/htmlUser-Agent: Mozilla/5.0

// /foo?p=v1$uri = $_SERVER['REQUEST_URI'];$p = isset($_GET['p']) ? $_GET['p'] : '';$host = $_SERVER['HTTP_HOST'];$accept = $_SERVER['HTTP_ACCEPT'];$ua = $_SERVER['HTTP_USER_AGENT'];


use Symfony\Component\HttpFoundation\Request;$request = Request::createFromGlobals();

$uri = $request->getPathInfo(); /foo$p = $request->query->get('p');$host = $request->getHost();$accept = $request->headers->get('Accept');

GET /foo?p=v1 HTTP/1.1Host: knplabs.comAccept: text/htmlUser-Agent: Mozilla/5.0


The Response


HTTP/1.1 200 OKDate: Tue, 04 Jun 2011 21:05:05 GMTContent-Type: text/htmlSet-Cookie:foo=fooval; path=/; httponly

<h1>Foo!</h1>

header('Content-Type', 'text/html');setcookie('foo', 'fooval');echo '<h1>Foo!</h1>';


HTTP/1.1 200 OKDate: Tue, 04 Jun 2011 21:05:05 GMTContent-Type: text/htmlSet-Cookie:foo=fooval; path=/; httponly

<h1>Foo!</h1>

use Symfony\Component\HttpFoundation\Response;use Symfony\Component\HttpFoundation\Cookie;

$response = new Response('<h1>Foo!</h1>');$cookie = new Cookie('foo', 'fooval');$response->headers->setCookie($cookie);

$response->send();Friday, September 28, 12

A Mini Framework


// not dependable!$uri = $_SERVER['REQUEST_URI'];

ob_start();if ($uri == '/') { echo 'Homepage! \o/';} else { echo 'sad missing page :/';}

header('X-TOKEN: Foo');

ob_end_flush();Friday, September 28, 12

$req = Request::createFromGlobals();

if ($req->getPathInfo() == '/') { $res = new Response('Homepage! \o/');} else { $res = new Response('sad missing page :/');}

$res->headers->set('X-SECRET', 'Foo');

$res->send();

Symfony3


Get some learning about HttpFoundation

@weaverryan

• Docs: http://bit.ly/sf2-http-foundation• Code: http://bit.ly/sf2-http-foundation-code• API: http://bit.ly/sf2-http-foundation-api


http://bit.ly/sf2-finder-api


Level 2

HttpKernelsymfony/http-kernel


@weaverryan

FrameworkRequest

Determine the controller

?

? ?

Execute it

Flush the ResponseResponse


Framework:

A pattern for converting a request into a response


@weaverryan

FrameworkRequest


?

? ?

Execute it



@weaverryan

HttpKernelRequest


?

? ?

Execute it



$kernel = new HttpKernel(...);$request = Request::createFromGlobals();$response = $kernel->handle($request);$response->send();

There be magic inside!


These lines execute your Symfony application

(hint, see - web/app.php)


... and Drupal 8 too ...


Yea, this is abstract

Stay Tuned...


Level 3

EventDispatchersymfony/event-dispatcher


@weaverryan

Event Dispatcher

A classic “observer pattern”

Listener

Listener

Tell me when Lizgets to work

Tell me when Lizgets to work


@weaverryan

Event Dispatcher

• Event Dispatcher: a classic “observer pattern”

Listener

Listener

Yo! I’m at work!


@weaverryan

Event Dispatcher


Listener

Listener

Liz is atwork!

Liz is atwork!


Event Dispatcher


Listener

Listener

She’s the best around!

I’m totally going to go talk

with her!!


Level 4

Routingsymfony/routing


@weaverryan

RouterUrl

Match againsta route

Return infoabout the routeRoute

Route


$loader = new ClosureLoader();$router = new Router($loader, function() { $collection = new RouteCollection();

$route = new Route('/blog/{slug}'); $collection->add('blog', $route);

return $collection;});$results = $router->match('/blog/sflive');

array( 'slug' => 'sflive', '_route' => 'blog',)


$loader = new ClosureLoader();$router = new Router($loader, function() { $collection = new RouteCollection();

$route = new Route('/blog/{slug}', array( '_controller' => 'SomeBundle:Blog:show' )); $collection->add('blog', $route);

return $collection;});$results = $router->match('/blog/sflive');

array( '_controller' => 'SomeBundle:Blog:show', 'slug' => 'sflive', '_route' => 'blog')


Input: Request Information

Output: An array of info


Level 5

A “Framework”


$kernel = new HttpKernel(...);$request = Request::createFromGlobals();$response = $kernel->handle($request);$response->send();


@weaverryan

HttpKernel::handle()

HttpFoundation

+

EventDispatcher

+

Routing (optional)

=

Framework


@weaverryan

HttpKernel::handle()

Request

+

Determine Controller

+

Controller Returns a Response

=

Response


Homework:Hack your Framework

... or do Karaoke later... your call


@weaverryan

HttpKernel::handleRaw()private function handleRaw(Request $request, $type = self::MASTER_REQUEST){ // request $event = new GetResponseEvent($this, $request, $type); $this->dispatcher->dispatch(KernelEvents::REQUEST, $event);

if ($event->hasResponse()) { return $this->filterResponse($event->getResponse(), $request, $type); }

// load controller if (false === $controller = $this->resolver->getController($request)) { throw new NotFoundHttpException('Unable to find the controller); }

$event = new FilterControllerEvent($this, $controller, $request, $type); $this->dispatcher->dispatch(KernelEvents::CONTROLLER, $event); $controller = $event->getController();

// ... returns a response}

The kewlest code I know about... seriously


@weaverryan

• Symfony\Component\HttpKernel\HttpKernel::handle()http://bit.ly/sf2-http-kernel-code

• Symfony Framework Important Classes

Symfony\Component\HttpKernel\EventListener\RouterListener- Executes the routing

Symfomy\Bundle\FrameworkBundle\Controller\ControllerResolver- Parses _controller and instantiates the controller object

step/var_dump()die; the core


Timeline of events in the Symfony Framework

kernel.request

kernel.controller

kernel.response


Profile events in the Symfony Framework



@weaverryan


AwesomeTools


Process

symfony/process

Now with more Windows Love!


@weaverryan

{ "require": { "symfony/process": "2.1.x-dev" }}

Find Symfony’s Process on Packagist.org

php composer.phar install

1

2

3

<?php// your app



<?php// dinner.php

for ($i = 1; $i <= 3; $i++) { sleep(1); echo sprintf("Cooking... %s\n", $i);}

echo "DING! \n";

External Script to Cook Dinner


Run the script synchronously


// app.phprequire 'vendor/autoload.php';

use Symfony\Component\Process\Process;

$process = new Process('php dinner.php');// if dinner takes longer than 5 seconds// to cook, freak out!$process->setTimeout(5);

$process->run(function($type, $buffer) { echo $buffer;});

// executed after the command finishesif (!$process->isSuccessful()) { throw new \Exception('Process misbehaved')}



Run the script asynchronously


$process = new Process('php dinner.php');$process->start();

// do more work hereecho "WORKING!!! \n";

while ($process->isRunning()) { // wait for the process to finish};echo $process->getOutput();


Interacting via Stdin


$process = new Process('php dinner.php');$process->setStdin('turkey');

“turkey” is read from Stdin


$process = new Process('php dinner.php');$process->run(function($type, $buffer) { if ($type == 'err') { // perhaps do some logging? echo $buffer; }});

Handling things that blow up!

if (!$process->isSuccessful()) { echo sprintf( "Process failed! Exit code %s, '%s'\n", $process->getExitCode(), $process->getExitCodeText() );}


Find out more about Process

@weaverryan

• Docs: http://bit.ly/sf2-process• Code: http://bit.ly/sf2-process-code• API: http://bit.ly/sf2-process-api


http://bit.ly/sf2-process-api

http://bit.ly/sf2-process-api

SPORK!@kriswallsmith

$manager = new Spork\ProcessManager();$manager->fork(function() { // do something in another process! return 'Hello from '.getmypid();})->then(function(Spork\Fork $fork) { // do something in the parent process afterwards echo "{$fork->getPid()} says '{$fork->getResult()}'";});

Fork yourself some more PHP

https://github.com/kriswallsmith/spork




Finder

symfony/finder


From the Fablog

http://fabien.potencier.org/article/44/php-iterators-and-streams-are-awesome

use Symfony\Components\Finder\Finder; $s3 = new \Zend_Service_Amazon_S3($key, $secret);$s3->registerStreamWrapper("s3"); $finder = new Finder();$finder->name('photos*') ->size('< 100K') ->date('since 1 hour ago');foreach ($finder->in('s3://bucket-name') as $file) { // do something print $file->getFilename()."\n";}






http://www.php.net/print

http://www.php.net/print

Find(er) out more about Finder

@weaverryan

• Docs: http://bit.ly/sf2-finder• Code: http://bit.ly/sf2-finder-code• API: http://bit.ly/sf2-finder-api




Filesystem

symfony/filesystem

New in 2.1!


@weaverryan

{ "require": { "symfony/filesystem": "2.1.x-dev" }}

Find Symfony’s Filesystem on Packagist.org

php composer.phar update symfony/filesystem

1

2

3

<?php// your app



// ...

use Symfony\Component\Filesystem\Filesystem;

$filesystem = new Filesystem();$filesystem->copy( 'cowboy.jpg', 's3://my-bucket/cowboy.jpg');$filesystem->copy( 's3://my-bucket/rodeo.mov', 'rodeo.mov');$filesystem->mirror( 'thumbnails', 's3://my-bucket/thumbnails');


// ...

use Symfony\Component\Filesystem\Filesystem;use Symfony\Component\Finder\Finder;

$finder = new Finder();$finder->name('*.jpg') ->date('since 1 hour ago'); ->in('thumbs');$filesystem = new Filesystem();$filesystem->chmod($finder, 0777);


// ...

use Symfony\Component\Filesystem\Filesystem;

$filesystem = new Filesystem();$filesystem->touch('foo.txt');$filesystem->chmod('foo.txt', 0777);$filesystem->symlink('/some/dir', '/symlink/target')


Find out more about Filesystem

@weaverryan

• Docs: http://bit.ly/sf2-filesystem• Code: http://bit.ly/sf2-filesystem-code• API: http://bit.ly/sf2-filesystem-api


http://bit.ly/sf2-filesystem-api

http://bit.ly/sf2-filesystem-api

Console

symfony/console



<?php// command.php

$loader = require 'vendor/autoload.php';$loader->add('App', __DIR__);

use Symfony\Component\Console\Application;use App\Command\EchoCommand;

$app = new Application();$app->add(new EchoCommand());$app->run();


namespace App\Command;

use Symfony\Component\Console\Command\Command;use Symfony\Component\Console\Input\InputInterface;use Symfony\Component\Console\Output\OutputInterface;

class EchoCommand extends Command{ protected function configure() { $this->setName('echo')->addArgument('msg'); }

public function execute( InputInterface $input, OutputInterface $output) { $output->writeln('Yo '.$input->getArgument('msg')); }}


Output with pretty colors


Find out more about Command

@weaverryan

• Docs http://bit.ly/sf2-console• Code http://bit.ly/sf2-console-code

• API http://api.symfony.com/master/namespaces.html-> and search for “Console”


http://bit.ly/sf2-console-code

http://bit.ly/sf2-console-code

http://api.symfony.com/master/namespaces.html

http://api.symfony.com/master/namespaces.html

If you download Composer in the next 5 minutes, we’ll

throw in a special gift!


CssSelector + DomCrawler

symfony/css-selectorsymfony/dom-crawler


require 'vendor/autoload.php';use Symfony\Component\DomCrawler\Crawler;

$html = <<<'HTML'<!DOCTYPE html><html> <body> <p class="message">Hello World!</p> <p>Hello Crawler!</p> </body></html>HTML;

$crawler = new Crawler($html);

$crawler->filter('p')->eq(0)->attr('class');$crawler->filter('p')->eq(1)->text();


Goutte!


Config

symfony/config


Config

@weaverryan

• Load configuration from many formats (YAML, PHP files, XML)

• Config Validation

• Caching for parsed config


Validator

symfony/validator


Shh... a little setup



use Symfony\Component\Validator\Validator;use Symfony\Component\Validator\Mapping\ClassMetadataFactory;use Symfony\Component\Validator\ConstraintValidatorFactory;

// a little setup$metadata = new ClassMetadataFactory();$constraintFactory = new ConstraintValidatorFactory();$validator = new Validator($metadata, $constraintFactory);


use Symfony\Component\Validator\Constraints\Email;

$value = 'ryan[AT]knplabs.com';$email = new Email();$email->message = 'Invalid! You entered {{ value }}';$errors = $validator->validateValue($value, $email);

if (count($errors) > 0) { echo strtr( $errors[0]->getMessageTemplate(), $errors[0]->getMessageParameters() );}


34 Core Validators and counting• String length• Regular expressions• Ip addresses• Dates• Collections• File size, mime-type, etc

... and the brand new Luhn validatorfor credit card numbers thanks to@merk ----------------------------------->

@weaverryan

See the “Reference”section of the docs


But wait there’s more!


More Components

• DependencyInjection• Security• OptionsResolver• Locale• Serializer• Templating• Form• Translation


Many components are easy


Some are still wtf-hard


(cough) Security (cough)


DocumentationDocumentationDocumentation


The Security Component

https://github.com/symfony/symfony-docs/pull/1604

WIP by @matthiasnoback




Act 3

Kicking ass in the new PHP eco-system


The PHP Ecosphere

• Symfony• Zend Framework• EZ Components• Drupal• ...• Individuals

@weaverryan

Symfony is only one part of the picture

What other stuff exists?


How do we find good libraries?




Some Favorites


Minkbehat/mink

http://mink.behat.org/

By @everzet, written onFabien’s childhood computer




Command a browser, find elements, click them, and fill out forms

$driver = new \Behat\Mink\Driver\SahiDriver('firefox');$session->visit('http://my_project.dev/some_page.php');

$page = $session->getPage();

$anchor = $page->find('css', '.something');$anchor->click();

// get the content of the new pageecho $page->getContent();


Monologmonolog/monolog

https://github.com/Seldaek/monolog

Your Friend Jordi




A Logger, where bells and whistles come standard

use Monolog\Logger;use Monolog\Handler\StreamHandler;use Monolog\Handler\FirePHPHandler;

// Create the logger$logger = new Logger('my_logger');$logger->pushHandler(new StreamHandler( __DIR__.'/my_app.log'));$logger->pushHandler(new FirePHPHandler());

$logger->addInfo('My logger is now ready');


Zend Framework 2

They have some stuff


Yay Find More!


Epilogue

4 Reasons to getsilly-excited about

the Future


1) Look for Participation & Consolidation


Shared Building-blocks

• Drupal• phpBB• Midgard• Zikula• ez Publish 5• ...


Less Library Duplication?

• Zend/Form• Zend/Serializer• Zend/Http• Zend/EventManager• Zend/Log• Zend/Navigation• ...

@weaverryan

• Symfony/Form• Symfony/Serializer• Symfony/HttpFoundation• Symfony/EventDispatcher• Monlog• KnpMenu• ...


2) More high quality, community-grown libraries


Solving 1 specific problem is a low barrier to entry


Find them, fork them.


Write their docs :)


Programmers that write docs get hugs


3) Easier upgrades


4) Grow your Community


Solutions exist outside of your framework


Fabien will not come to your house and tell you about them


Cast your vote by using the best libraries and improving

them


and realize the power of the entire PHP community


Thanks...



... and we love you!



https://joind.in/7218




Date post:	18-Oct-2014
Category:	Technology
View:	13,390 times
Download:	2 times

The Wonderful World of Symfony Components

Technology