Slides components en

Symfony’s secret weapon

Javier López | @loalf

Components

domingo 27 de noviembre de 11

The components


The components are a set of standalone,

decoupled and cohesive PHP libraries that solve

common web development problems.


21 Components

Browserkit EventDispatcher

RoutingClassLoader

Finder

Security

Config

Form

Serializer

Console

HttpFoundation

Templating

CssSelector

HttpKernel

Translation

Locale

DependencyInjection

Validator

DomCrawler

Process

Yaml


Installing


mkdir ComponentPlayground

cd ComponentPlayground

mkdir vendor

cd vendor

git clone https://github.com/symfony/symfony


https://github.com/symfony/symfony

https://github.com/symfony/symfony

download


<?php

require_once __DIR__.'/vendor/symfony/src/Symfony/Component/ClassLoader/UniversalClassLoader.php';

use Symfony\Component\ClassLoader\UniversalClassLoader;

$loader = new UniversalClassLoader();$loader->registerNamespaces(array( 'Symfony' => __DIR__.'/vendor/symfony/src',));

$loader->register();

autoload.php


<?php

require_once 'autoload.php';

/*

* Sample code

*/

sample.php

> php sample.php


Yaml


Parsing and generating YAML files


#example.yml

description: “Users of Symfony”users: javi: name: “Javi” surname: “López” rob: name: “Rob” surname: “Waring”

use Symfony\Component\Yaml\Yaml;

$data = Yaml::parse('example.yml');

print $data['description'];

foreach( $data['users'] as $user){ print $user['name'] .' '. $user['surname'];}

parsing YAML files


description: “Symfony users”users: 0: name: “Javi” surname: “López” 1: name: “Rob” surname: “Waring”


$data['description'] = "Symfony Users”

$data['users'][] = array( 'name' => 'Javi', 'surname' => 'Lopez' );

$data['users'][] = array( 'name' => 'Rob', 'surname' => 'Waring' );

print Yaml::dump($data);

generating YAML files


#example.yml

generated: <?php echo date(‘Y’); ?>description: “Users of Symfony”users: javi: name: “Javi” surname: “López” rob: name: “Rob” surname: “Waring”


Yaml::enablePhpParsing();

$data = Yaml::parse('example.yml');

print $data['generated'];

YAML & PHP


Finder


Finding files and directories the easy way


use Symfony\Component\Finder\Finder;

$files = Finder::create()

->name("*.php")

->name("*.{php,yml}")

->name("/\.(php|yml)$/")

->name("/^\w{3,10}$/")

->name("foo.php")

->in(__DIR__);

finding by name

Referencia sobre Patrones Glob: http://cowburn.info/2010/04/30/glob-patterns/


http://cowburn.info/2010/04/30/glob-patterns/

http://cowburn.info/2010/04/30/glob-patterns/



->size("> 10k")

->size("<= 4mi")

->size("2gi")

->in(__DIR__);

finding by size

k = 1000m = 1000^2g = 1000^3

ki = 1024mi = 1024^2gi = 1024^3




->date("since yesterday")

->date("until 2 days ago")

->date("> now - 2 hours")

->date(">= 2005-10-15 ")

->in(__DIR__);

finding by date

Every parameter valid to strtotime()




->depth(0)

->depth(>1)

->depth(<3)

->in(__DIR__);

fixing the depth




->files()

->in(__DIR__);

just files




->directories()

->in(__DIR__);

just directories




->sortByName()

->sortByType()

->sort( function(\SplFileInfo $file1, \SplFileInfo $file2){ return $file1->getSize() > $file2->getSize(); } ) ->in(__DIR__);

sorting




->files()

->depth(0)

->name("*.php")

->in(__DIR__);

php files in the project root directory


$s3 = new \Zend_Service_Amazon_S3($key, $secret);

$s3->registerStreamWrapper("s3");


->name('*.{jpg,jpeg,png,gif}')

->size('< 100K')

->date('since 1 hour ago')

->in('s3://bucket-name');

images in Amazon S3


Process


Easening command system execution


use Symfony\Component\Process\Process;

$process = new Process('ping -c 1 twitter.com');

$process->run();

if($process->isSuccessful()){

print "Twitter is online";

}else{

print "Twitter is offline";

}

Is Twitter online?


ping -c 4 twitter.com



$process->run();

if($process->isSuccessful())

{

$output = $process->getOutput();

$pattern = '/time=(\d+\.\d+) ms/';

preg_match_all($pattern, $output, $matches);

$average = array_sum($matches[1])/count($matches[1]);

printf("Avergage time=%.3f ms", $average);

}else{


}

showing the average time


use Symfony\Component\Process\Process;


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

if('out' === $type){

$pattern = '/time=(\d+\.\d+) ms/';

if(preg_match_all($pattern, $buffer, $matches)){;

print $matches[0][0]."\n";

}

}elseif( 'err' === $type ){


}

});

showing just the time


DomCrawler


extracting information from the DOM


use Symfony\Component\DomCrawler\Crawler;

$uri = 'http://search.twitter.com/search.atom?q=symfony2';

$crawler = new Crawler();

$content = file_get_contents($uri);

$crawler->addXmlContent($content);

foreach($crawler->filterXpath('//content') as $node)

{

print $node->nodeValue;

}

Twitter search


http://search.twitter.com/search.atom?q=sf2vigo'

http://search.twitter.com/search.atom?q=sf2vigo'


$uri = 'http://symfony.com/blog';

$content = file_get_contents($uri);

$crawler = new Crawler($content, $uri);

$nodes = $crawler->filterXPath('//div[@class="box_article"]//a');

foreach($nodes->links() as $link)

{

print $link->getUri();

}

Symfony.com blog posts


http://symfony.com/blog'


CssSelector


CSS Selector => XPath expressions


use Symfony\Component\CssSelector\CssSelector;

print CssSelector::toXPath('div.box_article a');

/*

* descendant-or-self::div[

* contains(

* concat(' ', normalize- space(@class), ' '),

* ' box_article '

* )

* ]/descendant::a

*/

from CSS to XPath



$uri = 'http://symfony.com/blog';$content = file_get_contents($uri);

$crawler = new Crawler($content, $uri);

$nodes = $crawler->filter('div.box_article a');

Symfony.com blog posts




Templating


A simple and easy template engine


4 words


Loader: finds a template


NameParser: converts templates name to templates objects


Engine: renders templates


Helpers: adds extra functionality


// __DIR__/templates/index.php

<?php echo $name; ?>

A simple example


use Symfony\Component\Templating\Loader\FilesystemLoader;

use Symfony\Component\Templating\PhpEngine;

use Symfony\Component\Templating\TemplateNameParser;

$loader = new FilesystemLoader(

array(__DIR__.'/templates/%name%.php')

);

$parser = new TemplateNameParser();

$engine = new PhpEngine($parser, $loader);

echo $engine->render('index', array('name' => 'Javi'));

A simple example


// __DIR__/templates/layout.php

<div id="header">

<h1>Cabecera</h1>

</div>

<div id="content">

<?php echo $view['slots']->get('_content'); ?>

</div>

<div id="footer">

<p>Pie</p>

</div>

Inheritance


// __DIR__/templates/index.php

<?php echo $view->extend('layout'); ?>

<p><?php echo $name; ?>

</p>

Inheritance


use Symfony\Component\Templating\Helper\SlotsHelper;

$loader = new FilesystemLoader(

array(__DIR__.'/templates/%name%.php')

);

$parser = new TemplateNameParser();

$engine = new PhpEngine($parser, $loader, new SlotsHelper());

echo $engine->render('index', array('name' => 'Javi'));

Inheritance


<div id="header">

<h1>Cabecera</h1>

</div>

<div id="content">

<p>Javi</p>

</div>

<div id="footer">

<p>Pie</p>

</div>

Inheritance


and many more ...

... slots

... global variables

... escaping

... assets managment

... cache


Validator


asserting variable or object values


use Symfony\Component\Validator\Constraints\NotNull;

use Symfony\Component\Validator\Constraints\NotNullValidator;

$validator = new NotNullValidator();

if(!$validator->isValid(null, new NotNull()))

{

print $validator->getMessageTemplate();

// "The value should not be null"

}

Validating a value is not null


24 ValidatorsBlank Max

MinNotBlank

Null

Date

DateTime

True

False

NotNull

Time

Country

Email

Language

Collection

Locale

Url

Image

IP

File

Choice

CallbackSizeType


use Symfony\Component\Validator\Validator;

use Symfony\Component\Validator\ConstraintValidatorFactory;

use Symfony\Component\Validator\Mapping\BlackholeMetadataFactory;

use Symfony\Component\Validator\Constraints as Asserts;

$validator = new Validator(

new BlackholeMetadataFactory,

new ConstraintValidatorFactory

);

$errors = $validator->validateValue('', new Asserts\NotBlank());

if($errors->count())

{

print $errors;

}

Using the Validator service

ConstraintViolationList


class Person

{

public $name;

public $age;

}

Validando un objeto (PHP)

$name must not be empty $age must be a number between 18 and 99




use Symfony\Component\Validator\Mapping\ClassMetadataFactory;

use Symfony\Component\Validator\Mapping\Loader\StaticMethodLoader;


new ClassMetadataFactory(new StaticMethodLoader() ),

new ConstraintValidatorFactory()

);

$person = new Person();

$errors = $validator->validate($person);

Validating an object (PHP)


use Symfony\Component\Validator\Mapping\ClassMetadata;

use Symfony\Component\Validator\Constraint as Asserts;

class Person

{

public $name;

public $age;

static function loadValidatorMetadata(ClassMetadata $metadata)

{

$metadata

->addPropertyConstraint('name', new Asserts\NotBlank())

->addPropertyConstraint('age' , new Asserts\Min(18));

->addPropertyConstraint('age' , new Asserts\Max(99));

}

}

Validating an object (PHP)


class Person

{

public $name;

public $age;

}

Validando un objeto (YAML)

$name must not be empty $age must be a number between 18 and 99


# validate.yml

Person:

properties:

name:

- NotBlank : ~

age:

- Min: 18

- Max: 99

Validating an object (YAML)




use Symfony\Component\Validator\Mapping\ClassMetadataFactory;

use Symfony\Component\Validator\Mapping\Loader\YamlFileLoader;


new ClassMetadataFactory(

new YamlFileLoader(__DIR__.'/validate.yml')

),

new ConstraintValidatorFactory()

);

$person = new Person();

$errors = $validator->validate($person);

Validating an object (YAML)


Console


Creating repetive tasks


// console.php

use Symfony\Component\Console\Application;

$console = new Application();

$console->run();

The easiest console ever


php console.php


php console.php help


php console.php help list



use Symfony\Component\Console\Input\InputArgument;


$console

->register('hello')

->setDefinition(array(

new InputArgument('name', InputArgument::REQUIRED, 'Name'),

))

->setDescription('It says hello to a person')

->setCode(function ($input, $output) {

$name = $input->getArgument('name');

$output->writeln(sprintf('Hello <info>%s</info>', $name));

})

;

$console->run();

Hello World ... for consoles


There is a better way to do it, Command


use Symfony\Component\Console\Command\Command;use Symfony\Component\Console\Input\InputArgument;

class HelloCommand extends Command{ public function configure() { $this->setName('hello'); $this->setDefinition(array( new InputArgument('name', InputArgument::REQUIRED, 'Name'), )) $this->setDescription('Say hello to a person') }

public function execute($input, $output) { $name = $input->getArgument('name'); $output->writeln(sprintf('Hello <info>%s</info>', $name)); }}

Creating a new command




$console->add(new HelloCommand());

$console->run();

Creating a new command


Thanks@loalf

Créditos: http://www.flickr.com/photos/normalityrelief/3075723695/


http://www.flickr.com/photos/normalityrelief/3075723695/

http://www.flickr.com/photos/normalityrelief/3075723695/

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