Symfony2 components to the rescue of your PHP projects

Xavier Lacot – June 2012 Symfony2 components to the rescue
of your PHP projects

2 Symfony2 components to the rescue of your PHP projects
JoliCode | Xavier Lacot | Symfony Live 2012 Hello My name is Xavier Lacot ▪ Web and Mobile at http://jolicode.com ▪ Formerly PHP technical leader at Clever Age ▪ Open Source convinced and contributor ▪ In PHP, mainly Symfony ▪ In javascript, etc. ▪ Président of AFUP – the French PHP Users Association (afup.org) ▪ Forum PHP ▪ PHP Tour ▪ http://twitter.com/xavierlacot

JoliCode | Xavier Lacot | Symfony Live 2012 Summary 1. PHP in 2012, a living ecosystem 2. 2005's PHP is now just pain 3. Migration strategies ▪ The slow path ▪ Switch progressively 4. Symfony components for your pleasure ▪ Your prefered migration toolkit ▪ Case Study

JoliCode | Xavier Lacot | Symfony Live 2012 Before we start How many of you use a framework on a regular basis? How many of you must deal with no-framework applications?

PHP in 2012, a living ecosystem

JoliCode | Xavier Lacot | Symfony Live 2012 A few things about PHP ▪ A pragmatic language built for the Web ▪ PHP5 since 2005 ▪ One of the most used languages on the Web PHP – solves problems since 1995

JoliCode | Xavier Lacot | Symfony Live 2012 The language improves ▪ PHP 5.3 introduced new concepts : ▪ Usage of namespaces ▪ Lambda and closures ▪ Phar archives ▪ “goto” WTF ??? namespace JoliCode\Conferences; use General\Talk\Session; class SymfonyLive extends Session { public function runPresentation() { // do something nice... } }

JoliCode | Xavier Lacot | Symfony Live 2012 Namespaces manipulation ▪ Pro ▪ No more collisions ▪ Less ambiguity ▪ Ahah, short class names. No more long classnames ▪ Cons ▪ Don't forget the use statement use One\Full\Classname as Something; $object = new Something;

JoliCode | Xavier Lacot | Symfony Live 2012 And it still evolves ▪ PHP 5.4 ▪ Some deprecated features removed ▪ Performance improvements ▪ Instance Method Calls ▪ Closures inside objects ▪ Traits, aka. assisted copy/paste ▪ Arrays manipulation $post = (new Post)->setTitle('Hello poneys')->save(); function fruits() { return ['apple', 'banana', 'orange']; } echo fruits()[0]; // Outputs: apple

JoliCode | Xavier Lacot | Symfony Live 2012 The ecosystem improves ▪ Last years = bunch of new things ▪ New (versions of) frameworks ▪ New tools ▪ Dependancies resolution ▪ Code analysis ▪ Continuous integration ▪ Structuration of the projects ▪ Standards ▪ Discussions ▪ More and more conferences

JoliCode | Xavier Lacot | Symfony Live 2012 New frameworks

JoliCode | Xavier Lacot | Symfony Live 2012 ClassLoader and PSR-0 ▪ PSR-0 : ▪ A standardization agreement ▪ Scope: classes naming and organization ▪ Idea : match the path of the file containg a class to this full class name class: Symfony\Component\HttpFoundation\Request path: vendor/src/Symfony/Component/HttpFoundation/Request.php class: Twig_Extension_Core path: vendor/twig/lib/Twig/Extension/Core.php

JoliCode | Xavier Lacot | Symfony Live 2012 ClassLoader and PSR-0 class: Symfony\Component\HttpFoundation\Request path: vendor/src/Symfony/Component/HttpFoundation/Request.php class: Twig_Extension_Core path: vendor/twig/lib/Twig/Extension/Core.php PEAR naming style Namespaced classes style autoloading path prefix

JoliCode | Xavier Lacot | Symfony Live 2012 Composer ▪ A packages management tool ▪ Launched in 2012 ▪ Composer : a tool for managing dependancies ▪ Packagist.org : a repository of packages ▪ See the talk of Jordi Boggiano and Nils Adermann

JoliCode | Xavier Lacot | Symfony Live 2012 Dependancies resolution using Composer ▪ And more: ▪ Post install commands ▪ Configuration variables ▪ etc. { "name": "joli/demo-project", "description": "A simple demo project", "require": { "php": ">=5.3.3", "symfony/symfony": "2.1.*", "seld/jsonlint": "1.0.0" } } composer.json $ php composer.phar install Installing dependencies from lock file - Updating twig/twig (dev-master)

JoliCode | Xavier Lacot | Symfony Live 2012 Packagist ▪ The packages repository behind packagist ▪ A great resource for finding high quality contributions ▪ Definitively forget about PEAR or distro packages ▪ Fear that packagist might break? Build your own repository with satis - https://github.com/composer/satis

JoliCode | Xavier Lacot | Symfony Live 2012

JoliCode | Xavier Lacot | Symfony Live 2012 PHP gets is a professional language ▪ PHP is not anymore an amateur language ▪ Continuous integration (hi Jenkins, Sismo and Travis) ▪ Unit tests (hi PHPUnit, SimpleTest, Atoum) ▪ Code quality analysis and metrics ▪ Code improvement tools (Hi PHP-CS-Fixer) ▪ etc. ▪ PHP developers have grew up since 2002 ▪ The language is more mature ▪ The community too

JoliCode | Xavier Lacot | Symfony Live 2012 Cheers GitHub

JoliCode | Xavier Lacot | Symfony Live 2012 GitHub ▪ Social coding ▪ Gathers many Open Source contributions ▪ Watch, fork, comment, request pulls ▪ Fun and nice ▪ 2,500,000 projects, ~ 150,000 PHP projects ▪ A great market for the developer! PHP switched from SVN to Git

JoliCode | Xavier Lacot | Symfony Live 2012 Summary 1. PHP in 2012, a living ecosystem 2. 2005's PHP is now just pain 3. Migration strategies ▪ The slow path ▪ Switch progressively 4. Symfony components for your pleasure ▪ Your prefered migration toolkit ▪ Case study

2005's PHP is now just pain

JoliCode | Xavier Lacot | Symfony Live 2012 Oh yes we did it... <html> <body> <?php include("includes/menu.inc.php"); $file = (isset($_GET['pages'])) ? "pages/".$_GET['page'].".php" : "pages/404.php"; if ( !file_exists($file) ) { @include("pages/404.php"); } else { $allowed = realpath('./pages'); if ( !@ereg($allowed."*", realpath($file)) ) { @include("pages/404.php"); } else { @include($file); } } ?> </body> </html> somewhere in 2002...

JoliCode | Xavier Lacot | Symfony Live 2012 Oh yes we did it... <html> <body> <?php include("includes/menu.inc.php"); $file = (isset($_GET['pages'])) ? "pages/".$_GET['page'].".php" : "pages/404.php"; if ( !file_exists($file) ) { @include("pages/404.php"); } else { $allowed = realpath('./pages'); if ( !@ereg($allowed."*", realpath($file)) ) { @include("pages/404.php"); } else { @include($file); } } ?> </body> </html> somewhere in 2002... ▪ HTML and PHP mix

JoliCode | Xavier Lacot | Symfony Live 2012 Oh yes we did it... <html> <body> <?php include("includes/menu.inc.php"); $file = (isset($_GET['pages'])) ? "pages/".$_GET['page'].".php" : "pages/404.php"; if ( !file_exists($file) ) { @include("pages/404.php"); } else { $allowed = realpath('./pages'); if ( !@ereg($allowed."*", realpath($file)) ) { @include("pages/404.php"); } else { @include($file); } } ?> </body> </html> somewhere in 2002... ▪ HTML and PHP mix ▪ Direct access to superglobals

JoliCode | Xavier Lacot | Symfony Live 2012 Oh yes we did it... <html> <body> <?php include("includes/menu.inc.php"); $file = (isset($_GET['pages'])) ? "pages/".$_GET['page'].".php" : "pages/404.php"; if ( !file_exists($file) ) { @include("pages/404.php"); } else { $allowed = realpath('./pages'); if ( !@ereg($allowed."*", realpath($file)) ) { @include("pages/404.php"); } else { @include($file); } } ?> </body> </html> somewhere in 2002... ▪ HTML and PHP mix ▪ Direct access to superglobals ▪ Use of the @ operator

JoliCode | Xavier Lacot | Symfony Live 2012 Oh yes we did it... <html> <body> <?php include("includes/menu.inc.php"); $file = (isset($_GET['pages'])) ? "pages/".$_GET['page'].".php" : "pages/404.php"; if ( !file_exists($file) ) { @include("pages/404.php"); } else { $allowed = realpath('./pages'); if ( !@ereg($allowed."*", realpath($file)) ) { @include("pages/404.php"); } else { @include($file); } } ?> </body> </html> somewhere in 2002... ▪ HTML and PHP mix ▪ Direct access to superglobals ▪ Use of the @ operator ▪ Urls tied to code structure

JoliCode | Xavier Lacot | Symfony Live 2012 Oh yes we did it... <html> <body> <?php include("includes/menu.inc.php"); $file = (isset($_GET['pages'])) ? "pages/".$_GET['page'].".php" : "pages/404.php"; if ( !file_exists($file) ) { @include("pages/404.php"); } else { $allowed = realpath('./pages'); if ( !@ereg($allowed."*", realpath($file)) ) { @include("pages/404.php"); } else { @include($file); } } ?> </body> </html> somewhere in 2002... ▪ HTML and PHP mix ▪ Direct access to superglobals ▪ Use of the @ operator ▪ Urls tied to code structure ▪ Duplicate code

JoliCode | Xavier Lacot | Symfony Live 2012 Not bad at all ▪ That was 10 years ago! ▪ No PHP5 at that time ▪ That was still flexible ▪ Just missed some concepts

JoliCode | Xavier Lacot | Symfony Live 2012 The shit of today was great yesterday So how did we improve things?

JoliCode | Xavier Lacot | Symfony Live 2012 2004 → 2007 ▪ First professional PHP frameworks ▪ Zend Framework ▪ Code Igniter ▪ Seagull PHP ▪ Cake PHP ▪ symfony 1 ▪ Jelix ▪ Pluf ▪ Yii ▪ etc.

JoliCode | Xavier Lacot | Symfony Live 2012 symfony 1 ▪ End 2005 : first public version (release 0.4) ▪ Developers say “hurra” ORM Ajax Plugins Console Conventions Debug toolbar Documentation Functionnal and Unit tests Internationalisation Community Helpers Routing Cache MVC

JoliCode | Xavier Lacot | Symfony Live 2012 Still not sufficient ▪ Several limits: ▪ Very monolithic ▪ Not very flexible ▪ Almost no components - use it all or don't use it ▪ Some things were a pain to achieve ▪ Extensive use of Singleton ▪ Hard (impossible) to write complete test suites ▪ Developers only ▪ Performances... ! ▪ Lots of bad contribs ▪ Low average community level

Migration strategies

JoliCode | Xavier Lacot | Symfony Live 2012 Pre-conditions ▪ You work since more than 5 years on your project ▪ A bunch of functionnalities ▪ The app is in production ▪ Lots of users and data ▪ A competent team ▪ But ▪ New developments are slow ▪ Infrastructure problems ▪ Hard to improve things ▪ You want to trash it all, and code like in 2012

JoliCode | Xavier Lacot | Symfony Live 2012 Your reality Pre-conditions

JoliCode | Xavier Lacot | Symfony Live 2012 Your expectations Pre-conditions

JoliCode | Xavier Lacot | Symfony Live 2012 Strategy #1 – big bang ▪ Most natural approach : rewrite everything ▪ Pro: ▪ A new solid and modern framework ▪ Leave away from the old crappy codebase ▪ Feel more happy ▪ Cons: ▪ Stop the company's business ▪ Spend 1y+ re-developing everything ▪ Have client cry ▪ Complex migration scripts ▪ Very risky

JoliCode | Xavier Lacot | Symfony Live 2012 ▪ Don't do that ▪ Too risky ▪ Lot of pressure ▪ Might lead to a disaster ▪ Your boss won't be happy ▪ Prefer a gradual approach Strategy #1 – big bang

JoliCode | Xavier Lacot | Symfony Live 2012 Strategy #2 – Be progressive ▪ Being progressive : ▪ Re-write step by step ▪ Control the way you build things ▪ Use Framework parts, not the complete framework ▪ Choose which parts to use ▪ Gradually raise the level of your team ▪ Less risky ▪ And your boss will love you

JoliCode | Xavier Lacot | Symfony Live 2012 Step #1 Switch to PHP 5.3 or PHP 5.4 NOW. thanks w3techs.com * Historical codebase PHP x.x Historical codebase PHP 5.3

JoliCode | Xavier Lacot | Symfony Live 2012 Step #1 ▪ Debian users : ▪ Update your distribution version (eventually) ▪ Update your packages (5 seconds) ▪ Mac Users : ▪ Please trash wamp and go grab http://php-osx.liip.ch/ (kudos Liip) ▪ Windows users Doh!

JoliCode | Xavier Lacot | Symfony Live 2012 Step #2 ▪ Create a solid foundation for your future new developments ▪ Put new things in your project ▪ Symfony components are up! Start with: ▪ ClassLoader ▪ DependencyInjection ▪ HTTPFoundation Historical codebase Historical codebase ClassLoader DIC HTTPFoundation

JoliCode | Xavier Lacot | Symfony Live 2012 Step #2 – install the components ▪ Use composer { "autoload": { "psr-0": {} }, "name": "xavierlacot/blog", "description": "My old blog on steroids", "require": { "php": ">=5.3.3", "symfony/class-loader": "2.1.*", "symfony/dependency-injection": "2.1.*", "symfony/http-foundation": "2.1.*" } } $ php composer.phar install Installing dependencies from lock file - Updating symfony/class-loader (dev-master)

JoliCode | Xavier Lacot | Symfony Live 2012 Step #2 – install the components ▪ What did we install while doing this? ▪ ClassLoader allows to load classes automagically, when required, if they follow a naming convention defined by PSR-0; ▪ DependancyInjection provides a set of tools for building object and classes in a standardized way, and reduce the BC breaks; ▪ HTTPFoundation is the basic toolkit when working with HTTP requests (all web pages, for example). ▪ We'll see all three later un the presentation

JoliCode | Xavier Lacot | Symfony Live 2012 Step #2 – install the components ▪ Composer is great ▪ It comes with an autoloader ▪ Using the classes is simple : ▪ And we're ready to start using the component classes! <?php require 'vendor/autoload.php'; index.php

JoliCode | Xavier Lacot | Symfony Live 2012 Step #3 – start using the components ▪ HTTPFoundation is the easiest component to start with – the one you can immediately use without breaking things use Symfony\Component\HttpFoundation\Request; $request = Request::createFromGlobals(); CreateFromGlobals() analyses the superglobals and populates the Request object index.php

JoliCode | Xavier Lacot | Symfony Live 2012 Step #3 – use HTTPFoundation Time to change your historical code... becomes $pagename = (isset($_GET['page'])) ? $_GET['page'] : "404"; $file = sprintf('pages/%s.php', $pagename); $pagename = $request->query->get('page', '404'); $file = sprintf('pages/%s.php', $pagename);

JoliCode | Xavier Lacot | Symfony Live 2012 Step #4 ▪ There's no step #4 ▪ The rest of the process is very similar ▪ Integrate the component ▪ Use it ▪ Refactor your code ▪ Simplify ▪ Iterate – don't break everything at once. Use components gradually

Symfony components for your pleasure

JoliCode | Xavier Lacot | Symfony Live 2012 So what are the Symfony Components ? ▪ Symfony components are : ▪ A set of independent libraries ▪ You can use them separately ▪ High quality code components, tested and documented ▪ Symfony components are not : ▪ A bootstrap ▪ They do not provide end user fonctionnalities ▪ They are the bricks of your new platform, but you will have to glue them together

JoliCode | Xavier Lacot | Symfony Live 2012 Symfony components ▪ The complete list is available at http://symfony.com/components ▪ Symfony2 is built with the Symfony components ▪ You will often use the symfony standard distribution, which contains all the components plus some bundles ▪ Components do not depend on any third party library ▪ All kind of stuff: ▪ HTTP management ▪ Cache ▪ Files finder ▪ Routing management ▪ Internationalization process ▪ Templating ▪ Forms management ▪ etc.

JoliCode | Xavier Lacot | Symfony Live 2012 Symfony components ▪ Here is the list of what you can get : ▪ BrowserKit ▪ ClassLoader ▪ Config ▪ Console ▪ CssSelector ▪ DependencyInjection ▪ DomCrawler ▪ EventDispatcher ▪ Finder ▪ Form ▪ HttpFoundation ▪ HttpKernel ▪ Locale ▪ Process ▪ Routing ▪ Security ▪ Serializer ▪ Templating ▪ Translation ▪ Validator ▪ Yaml

JoliCode | Xavier Lacot | Symfony Live 2012 Your prefered migration toolkit ▪ I won't detail all the components ▪ Here are (AMHA) the most useful (and straightforward) when migrating an old application: ▪ ClassLoader ▪ Console ▪ DependencyInjection ▪ Finder ▪ HttpFoundation ▪ Routing ▪ Templating ▪ Validator ▪ If you want to use more, consider using Symfony2 at some point

JoliCode | Xavier Lacot | Symfony Live 2012 ClassLoader ▪ loads classes automatically if they follow PSR-0; ▪ Migration process: 1. have your classes organization follow PSR-0 (renaming stuff) 2. Configure the ClassLoader <?php class prefixedLdapConnector { public function __construct() { // stuff } } ldap.php <?php namespace Prefix/Ldap/Client; class Client { public function __construct() { // stuff } } src/Ldap/Client.php

JoliCode | Xavier Lacot | Symfony Live 2012 ClassLoader ▪ loads classes automatically if they follow PSR-0; ▪ Migration process: 1. have your classes organization follow PSR-0 (renaming stuff) 2. Configure the ClassLoader <?php class prefixedLdapConnector { public function __construct() { // stuff } } ldap.php <?php namespace Prefix/Ldap; class Client { public function __construct() { // stuff } } src/Prefix/Ldap/Client.php

JoliCode | Xavier Lacot | Symfony Live 2012 ClassLoader ▪ Composer's autoloader is taking care of vendors installed by composer ▪ We must declare “our” classes: ▪ Possible to declare several namespaces at once: registerNamespaces(array(...)) use Symfony\Component\ClassLoader\UniversalClassLoader; $loader = new UniversalClassLoader(); $loader->registerNamespace('Prefix', __DIR__.'/src/'); $loader->register(); index.php

JoliCode | Xavier Lacot | Symfony Live 2012 Console ▪ Your best friend for writing: ▪ Command line tasks ▪ Cron jobs ▪ Repetitive asynchron tasks ▪ Pros: ▪ Input / Output management ▪ Colorization ▪ Well written ▪ Extensible

JoliCode | Xavier Lacot | Symfony Live 2012 Console ▪ Add the Console component to composer.json ▪ Update the dependencies : "require": { "php": ">=5.3.3", "symfony/class-loader": "2.1.*", "symfony/console": "2.1.*", "symfony/dependency-injection": "2.1.*", "symfony/http-foundation": "2.1.*" } $ php composer.phar update Updating dependencies - Installing symfony/console (dev-master) Writing lock file Generating autoload files

JoliCode | Xavier Lacot | Symfony Live 2012 Console ▪ Write a new command: <?php namespace Prefix\Command; class TwitterCommand extends Command { protected function configure() { $this ->setName('joli:twitter') ->setDescription('Gets updates from twitter') ; } protected function execute(InputInterface $input, OutputInterface $output) { $puller = $this->getContainer()->get('joli.twitter.puller'); $output->writeln("Contacting Twitter..."); $data = $puller->pull(); // do stuff with $data $output->writeln(sprintf('Tweets fetched. %s new tweets', count($tweets))); } } Hint: I did remove some “use” statements src/Prefix/Command/TwitterCommand.php

JoliCode | Xavier Lacot | Symfony Live 2012 Console ▪ Then create the executable file itself: ▪ Fix this file's permissions: #!/usr/bin/env php <?php require 'autoload.php'; use Prefix\Command\TwitterCommand; use Symfony\Component\Console\Application; $application = new Application(); $application->add(new TwitterCommand); $application->run(); console.php $ chmod 755 console.php

JoliCode | Xavier Lacot | Symfony Live 2012 Console ▪ And finally run the command: $ ./console joli:twitter Contacting Twitter... Tweets successfuly fetched. 0 new tweets $ ./console Console Tool Usage: [options] command [arguments] Options: --help -h Display this help message. --quiet -q Do not output any message. --verbose -v Increase verbosity of messages. --version -V Display this application version. --ansi Force ANSI output. --no-ansi Disable ANSI output. --no-interaction -n Do not ask any interactive question. Available commands: help Displays help for a command list Lists commands joli joli:twitter Gets updates from twitter

JoliCode | Xavier Lacot | Symfony Live 2012 Dependency Injection ▪ “Dependency Injection” is a rather cryptic name ▪ No drugs here, promise ▪ Here is an “old school” function prototype: ▪ It is bad, because: ▪ The prototype will change when you will have new requirements ▪ The order of the parameters is a hard constraint ▪ Maybe one day you'll store menu items in a NoSQL database, and not in a relational one anymore function makeMenu($sqlConnection, $menu, $nbItems = null, $level = 0, $startingWith = null) Copyright me a long long long time ago *

JoliCode | Xavier Lacot | Symfony Live 2012 Your existing app ▪ Your existing app does a lot of things ▪ Sending emails ▪ Parsing data ▪ Writing logs ▪ Storing data in databases

JoliCode | Xavier Lacot | Symfony Live 2012 Dependency Injection ▪ The Dependency Injection component provides a dependency injection container ▪ Imagine a large array of resources widely used in the whole application ▪ This “DIC” has some capacities: ▪ Resources are instantiated only when required; ▪ It is extensible; ▪ Each item of this DIC is called a “service” ▪ The SQL connection is a service ▪ Passing the DIC to a class automatically gives access to a large collection of services...!

JoliCode | Xavier Lacot | Symfony Live 2012 Dependency Injection DIC DIC Initialization Execution bootstrap Create services $container->get('mailer') Instantiate a non-existing service Call the service

JoliCode | Xavier Lacot | Symfony Live 2012 Implement your own services ▪ In the migration plan: ▪ convert the “service” functionnalities into real Symfony2 services, ▪ Create binding to the existing calls ▪ use them like before ▪ In the future, put all your services in the container. ▪ And use them from there

JoliCode | Xavier Lacot | Symfony Live 2012 DIC migration ▪ Imagine we have a “Mailer” class: ▪ A mail is sent in our code with: <?php namespace Prefix\Mailer; class Mailer { $prefix = ''; public function send($to, $subject, $body) { // etc. } } function saveUser($name, $email) { // stuff here $mailer = new Mailer; $mailer->send($user->getEmail(), 'Welcome '.$user->getName(), 'A test'); }

JoliCode | Xavier Lacot | Symfony Live 2012 DIC migration ▪ Create the service container: ▪ Pass it to our users management class ▪ Use it: use Symfony\Component\DependencyInjection\ContainerBuilder; $container = new ContainerBuilder(); $container->register('mailer', 'Mailer'); function saveUser($name, $email) { // stuff here $mailer = $this->container->get('mailer'); $mailer->send($user->getEmail(), 'Welcome '.$user->getName(), 'A test'); }

JoliCode | Xavier Lacot | Symfony Live 2012 DIC migration ▪ Benefits: ▪ The Mailer object is now only created in one place ▪ Its configuration is centralized ▪ It is easy to override in the user management class

JoliCode | Xavier Lacot | Symfony Live 2012 HttpFoundation ▪ We have already used a little the HTTP Foundation component ▪ One core concept of Symfony2 is the coverage of the framework ▪ It handles Requests ▪ And returns Responses Application User Request Response HTTP

JoliCode | Xavier Lacot | Symfony Live 2012 HttpFoundation ▪ HttpFoundation provides concepts for Request and Responses ▪ Every input from the user, or output to the user should pass through this component ▪ Request: ▪ $request→request represents $_POST ▪ $request→query represents $_GET ▪ $request→cookies represents $_COOKIE ▪ etc. use Symfony\Component\HttpFoundation\Request; $request = Request::createFromGlobals();

JoliCode | Xavier Lacot | Symfony Live 2012 HttpFoundation ▪ Response: ▪ Represents the stuff returned to the user through HTTP ▪ It implements HTTP 1.1, the response is customizable: use Symfony\Component\HttpFoundation\Response; $response = new Response(); $response->setContent('This will be the response content'); $response->headers->set('Content-Type', 'text/html'); $response->setStatusCode(200); // send the Response $response->prepare($request); $response->send();

JoliCode | Xavier Lacot | Symfony Live 2012 Migration plan for using HttpFoundation ▪ HTTPFoundation will help: ▪ Making your application more secure ▪ Enforce a normalization of the way the output is sent ot the user ▪ Migration plan: ▪ Start with systematically using the Request ibject in place of the superglobals ▪ Use Response objects whenever possible ▪ ob_* may help you ▪ Use a templating system to move view content in separate files

JoliCode | Xavier Lacot | Symfony Live 2012 Routing Component – what we did before... ▪ Didn't you find nasty the way we manage urls in our old app? $file = (isset($_GET['pages'])) ? "pages/".$_GET['page'].".php" : "pages/404.php"; if ( !file_exists($file) ) { @include("pages/404.php"); } else { $allowed = realpath('./pages'); if ( !@ereg($allowed."*", realpath($file)) ) { @include("pages/404.php"); } else { @include($file); } }

JoliCode | Xavier Lacot | Symfony Live 2012 ▪ Yes, it is far from perfect: ▪ Urls enforce code organization ▪ This system may cause security problems ▪ What if the “$allowed” check doesn't work? ▪ It is not extensible ▪ The url ↔ action matching is hardcoded, which means no possible alternative ▪ Bad for SEO ▪ http://example.org/index.php?page=news&id=3657 ▪ The Symfony2 Routing component helps handling urls in an abstract way Routing Component – what we did before...

JoliCode | Xavier Lacot | Symfony Live 2012 Routing Component ▪ Routing is a mechanism which allows to manage the address map of an application ▪ Very useful: ▪ Better SEO ▪ Better security ▪ Help reorganize the application internally ▪ Do not expose the technology you use

JoliCode | Xavier Lacot | Symfony Live 2012 Routing ▪ There are two types of routing ▪ “Descending” routing: maps an URI to an action the application must complete: ▪ /blog must display the list of posts ▪ /blog/2010/05/12/un-message.html must display the right post ▪ /contact must display the contact form ▪ “ascending” routing helps generate nice, SEO compliant URLs /blog Descending routing User

JoliCode | Xavier Lacot | Symfony Live 2012 Routing component – migration plan ▪ The migration plan for using this component will strongly depend on the way you developed your application. ▪ Usually: ▪ Add the component to composer.json, update ▪ In the front controller, use the routing to match certain urls and handle the request in a clean way ▪ This way, it won't affect other URLs ▪ Once installed, always use the Router when exposing new URLs

JoliCode | Xavier Lacot | Symfony Live 2012 In our example... ▪ First, declare the routes ▪ Then, match the requests to find the page to load // declare the routes $routes = new RouteCollection(); $routes->add( 'blog_show', new Route( '/blog/{year}/{month}/{slug}', array('pagename' => 'display_blog') ) ); $context = new RequestContext(); $context->fromRequest($request); $matcher = new UrlMatcher($routes, $context); try { $route = $matcher->match($request->getRequestUri()); // do things } catch (ResourceNotFoundException $e) { // handle exception } Hint: I did remove some “use” statements $route now contains the matched route parameters

JoliCode | Xavier Lacot | Symfony Live 2012 Generating URLs with the Routing Component ▪ $router::generate() allows to generate a URL with parameters: ▪ Of course, add the Routing as a service to the container! $generator = new UrlGenerator($routes, $context); $url = $generator->generate('blog_show', array( 'slug' => 'hello-les-poneys', 'year' => '2011', 'month' => '11' )); $response->setContent('Please go <a href="'.$url.'">here</a>'); $response->send();

JoliCode | Xavier Lacot | Symfony Live 2012 Questions ? Contact Xavier Lacot [email protected] 06 51 48 59 73 http://jolicode.com Twitter : @JoliCode

JoliCode | Xavier Lacot | Symfony Live 2012 Credits ▪ Photos – thanks to the photographers: ▪ http://www.flickr.com/photos/artbandito/67829362/ ▪ http://capsizedatsea.tumblr.com/post/9559345143 ▪ http://memegenerator.net

Symfony2 components to the rescue of your PHP p...

Symfony2 components to the rescue of your PHP projects

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