The Coolest Symfony Components you’ve never heard of - DrupalCon 2017

The Coolest Symfony
Components you’ve never
heard of
with your friend @weaverryan
(they’re just hiding in your project, waiting for their big break)

> Lead of the Symfony documentation team 
> Writer for KnpUniversity.com
> SensioLabs & Blackﬁre
fanboy/evangelist
> Husband of the much more
talented @leannapelham
knpuniversity.com
twitter.com/weaverryan
Hallo!
> Father to my more handsome son,
Beckett

What is Symfony
exactly?
@weaverryan

Symfony:
the reason you had to
wait 5 years for Drupal
to come out
@weaverryan

Nope!
(well maybe partially, but it was worth it!)
@weaverryan

Symfony is a collection
of small PHP libraries
(the components)
@weaverryan

Drupal uses
of these libraries
@weaverryan
100%65%80%53%

And how many of the 26
included components
are you using?
@weaverryan

Symfony & Composer
teamwork makes the dream work!
@weaverryan

https://www.ﬂickr.com/photos/debabratad/4569271310

public function build() { 
$items = []; 
 
$items[] = Drupal::root(); 
 
return [ 
'#theme' => 'item_list', 
'#list_type' => 'ul', 
'#items' => $items, 
]; 
}
Do you want to build a snowman? Or a block?

// sites/default/settings.php 
use SymfonyComponentDebugDebug; 
 
Debug::enable();

public function build() { 
$items = []; 
 
$items[] = Drupal::root(); 
 
return [ 
'#theme' => 'item_list', 
'#list_type' => 'ul', 
'#items' => $items, 
]; 
}

Wait! I didn’t
need to install it?
@weaverryan

{ 
"require": { 
"composer/installers": "^1.0.24", 
"wikimedia/composer-merge-plugin": "~1.3" 
} 
}
composer.json

{ 
"require": { 
"symfony/class-loader": "~2.8", 
"symfony/console": "~2.8", 
"symfony/dependency-injection": "~2.8", 
"symfony/event-dispatcher": "~2.8", 
"symfony/http-foundation": "~2.8", 
"symfony/http-kernel": "~2.8", 
"symfony/routing": "~2.8", 
"symfony/serializer": "~2.8", 
"symfony/translation": "~2.8", 
"symfony/validator": "~2.8", 
"symfony/process": "~2.8", 
"symfony/polyfill-iconv": "~1.0", 
"symfony/yaml": "~2.8", 
"twig/twig": "^1.23.1", 
},
}
core/composer.json

{ 
"require": { 
"composer/installers": "^1.0.24", 
"wikimedia/composer-merge-plugin": “~1.3",
"symfony/debug": "^2.8" 
} 
}
composer.json

use SymfonyComponentFinderFinder; 
 
$finder = new Finder(); 
$finder->files() 
->in(Drupal::root().'/core/themes/*/templates') 
->name('*.twig') 
->size('> 1k') 
->sortByName() 
; 
 
$items = []; 
foreach ($finder as $file) { 
// Cool! But what is $file? 
}

 
$finder->files() 
->in('ftp://example.com/templates/*/templates') 
->name('*.twig') 
->size('> 1k') 
->sortByName() 
; 
 
$items = []; 
// Cool! But what is $file? 
}

symfony/var-dumper
@weaverryan

use SymfonyComponentFinderSplFileInfo; 
 
$finder->files() 
->in(Drupal::root().'/core/themes/*/templates') 
->name('*.twig') 
->size('> 1k') 
->sortByName() 
; 
 
$items = []; 
dump($file); 
}

$items =[];
/** @var SplFileInfo $file */ 
$items[] = sprintf( 
'%s (%s kb)', 
$file->getFilename(), 
round($file->getSize() / 1024) 
); 
}

// command.php 
require __DIR__.'/vendor/autoload.php'; 
 
$app = new Application(); 
$app->register('greet') 
->addArgument('name', InputArgument::REQUIRED) 
->addOption('yell', null, InputOption::VALUE_NONE) 
->setCode(function($input, $output) { 
$name = $input->getArgument('name'); 
$greeting = sprintf(
'Hey <comment>'.$name.'!</comment>'); 
 
if ($input->getOption('yell')) { 
$greeting = strtoupper($greeting); 
} 
 
$output->writeln($greeting); 
}); 
 
$app->run();

$app->register('templates:find') 
->addArgument('dir', InputArgument::REQUIRED) 
$finder->files() 
->in($input->getArgument('dir')) 
// ... 
; 
 
/** @var SplFileInfo $file */ 
$output->writeln(sprintf( 
'<comment>%s</comment> <info>%s kb</info>', 
$file->getFilename(), 
round($file->getSize() / 1024) 
)); 
} 
});

@weaverryan
But wait, there’s more!

$table = new Table($output);
 
$table->setHeaders(['File', 'Size']); 
$progress = new ProgressBar($output, count($finder)); 
$table->addRow([ 
'<comment>'.$file->getFilename().'</comment>', 
'<info>'.round($file->getSize() / 1024).'</info>' 
]); 
 
$progress->advance(); 
usleep(500000); 
} 
$progress->clear(); 
$table->render();

$app->register('some-db-process') 
$kernel = new DrupalKernel('prod', $autoloader); 
$kernel->handle(new Request()); 
$container = $kernel->getContainer(); 
$database = $container->get('database'); 
 
// do some work in the database! 
$stmt = $database->query('SHOW TABLES’);
dump($stmt); 
});

symfony/ﬁlesystem
@weaverryan

$fs = new Filesystem(); 
$fs->mkdir(__DIR__.'/many/levels/deep'); 
$fs->mirror( 
__DIR__.'/core/themes/bartik/templates', 
__DIR__.'/many/levels/deep' 
); 
 
$fs->chmod( 
Finder::create()->files() 
->in(__DIR__.'/many/levels/deep') 
->name('block*'), 
0777 
);

$process = new Process('cowsay Mooooo'); 
$process->setTimeout(5); 
$process->start(); 
 
while ($process->isRunning()) { 
echo 'Running....'; 
sleep(1); 
} 
 
if (!$process->isSuccessful()) { 
echo 'Something is wrong with the cow!'; 
echo $process->getErrorOutput(); 
} else { 
echo $process->getOutput(); 
}

$store = new RedisStore( 
new PredisClient('tcp://localhost:6379') 
); 
$store = new RetryTillSaveStore($store); 
$factory = new Factory($store); 
 
$lock = $factory->createLock('some-lock'); 
 
if ($lock->acquire()) { 
// do you stuff that needs locking! 
$lock->release(); 
}

$databases['default']['default'] = array ( 
'database' => getenv('DB_NAME'), 
'username' => getenv('DB_USER'), 
'password' => getenv('DB_PASS'), 
'host' => getenv('DB_HOST'), 
'driver' => 'mysql', 
);

# .env 
DB_NAME=dcon_baltimore 
DB_USER=root 
DB_PASS=pass 
DB_HOST=localhost

use SymfonyComponentDotenvDotenv; 
 
$dotenv = new Dotenv(); 
$dotenv->load(__DIR__.'/../../.env'); 
 
$databases['default']['default'] = array ( 
// ... 
);

# .env 
DB_NAME=dcon_baltimore 
DB_USER=root 
DB_PASS=pass 
DB_HOST=localhost 
DEBUG=1
# some services.yml file
parameters:  
twig.config: 
debug: '%env(DEBUG)%'
… and in the future (8.4?) …

// create a new item by trying to get it from the cache 
$numProducts = $cache->getItem('stats.num_products'); 
 
// assign a value to the item and save it 
$numProducts->set(4711); 
$cache->save($numProducts); 
 
// retrieve the cache item 
$numProducts = $cache->getItem('stats.num_products'); 
if (!$numProducts->isHit()) { 
// ... item does not exists in the cache 
} 
// retrieve the value stored by the item 
$total = $numProducts->get(); 
 
// remove the cache item 
$cache->deleteItem('stats.num_products');

@weaverryan
✓choose from many adapters
(apcu, db, memcached, redis, etc)
✓cache tagging invalidation
✓expiration
✓free cookies

symfony/expression-language
@weaverryan

# Get the special price if 
user.getGroup() in ['good_customers', 'collaborator'] 
 
# Promote article to the homepage when 
article.commentCount > 100 and article.category not in ["misc"]
 
 
# Send an alert when 
product.stock < 15
What if you need to write business
logic… that’s stored in the database?

use SymfonyComponentExpressionLanguageExpressionLanguage; 
 
$language = new ExpressionLanguage(); 
 
class Apple 
{ 
public $variety; 
} 
 
$apple = new Apple(); 
$apple->variety = 'Honeycrisp'; 
 
var_dump($language->evaluate( 
'fruit.variety', 
array( 
'fruit' => $apple, 
) 
));

# ABC.routing.yml file
old_bay_season_food: 
path: /season/oldbay/{count} 
# require there to be a ?load=1 on the URL 
condition: "context.getQueryString() == 'load=1'" 
services: 
# new OldBaySeasoner( 
# $container->get('config.factory')->get('old_bay.default') 
# ); 
 
old_bay.seasoner: 
class: Drupalold_bayServiceOldBaySeasoner 
arguments: 
- '@=service("config.factory").get("old_bay.default")'
maybe in the future???

symfony/property-info
@weaverryan

$definition = new DefinitionBuilder() 
->addPlaces(['draft', 'review', 'rejected', 'published']) 
// Transitions have a unique name, origin place & destination place 
->addTransition(new Transition('to_review', 'draft', 'review')) 
->addTransition(new Transition('publish', 'review', 'published')) 
->addTransition(new Transition('reject', 'review', 'rejected')) 
->build() 
; 
 
$marking = new SingleStateMarkingStore('currentState'); 
$workflow = new Workflow($definition, $marking);
$workflow->can($post, 'publish'); // False 
$workflow->can($post, 'to_review'); // True 
 
$workflow->apply($post, 'to_review'); 
$workflow->can($post, 'publish'); // True
// ['publish', 'reject'] 
$workflow->getEnabledTransitions($post);0

symfony/your-laundry?
https://pixabay.com/p-567951/

Drupal is using
Symfony
@weaverryan

Side Note:
COMPOSER <3’S YOUR INSANE
LEGACY PROJECT
@weaverryan
(that you've been forced to maintain and not allowed to modernize, despite
numerous meetings and eﬀorts to explain things to management)

https://www.ﬂickr.com/photos/zzpza/32697842
You have Drupal
modules…

~50 Symfony
components

… and every other PHP
package on the planet

So build something
ridiculous
@weaverryan

Ryan Weaver
@weaverryan
THANK YOU!

The Coolest Symfony Components you’ve never heard of - DrupalCon 2017

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The Coolest Symfony Components you’ve never heard of - DrupalCon 2017