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I'm not a Drupal developer, but I do already know *a lot* about Drupal 8, like how the event system works, what a service is, how it relates to a dependency injection container and how the deepest and darkest of Drupal’s request-response workflow looks. How? Because I use Symfony. And if you want to get a jumpstart on Drupal 8, you should to. In this talk, we'll double the number of tools you have to solve problems (Drupal + Symfony) and start to unlock all the new important concepts. We'll start with Silex (a microframework based on Symfony), graduate to Symfony, and focus on the pieces that are most interesting to a Drupal 8 developer.
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PHP Tutorial Screencasts
MASTER THE NEW CORE OF DRUPAL 8 NOW: WITH
SYMFONY AND SILEX
!
!
!
!
!!• Husband of the much more talented @leannapelham
PHP Tutorial Screencasts
knplabs.com github.com/weaverryan
• Lead contributor to the Symfony documentation !• KnpLabs US - Symfony consulting, training, Kumbaya !• Writer for KnpUniversity.com
awesome amazing screencasts!!*!
Hallo!
Act 1 !
The anatomy of any web framework
@weaverryan
@weaverryan
An entire application that says hallo!
Configure Apache
Or use the built-in PHP web server \o/
php -S localhost:8000
@weaverryan
* The built-in PHP web server can be used with Drupal too!
Request -> Response Framework
Response: Hello Texas!@weaverryan
Routing: Determine a function that can
create this page (the controller)
Request: GET /hello/Texas!
The Controller: Our code: constructs the page
The route is matched when the URI is
/hello/*@weaverryan
If the URI matches the route, Silex executes this
function (the controller)
@weaverryan
The value of {name} is passed as an argument
to the controller
@weaverryan
We construct the page and celebrate!
@weaverryan
Request -> Response Framework
The Controller: Our code: constructs the page
Response: Hello Texas!@weaverryan
Routing: Determine a function that can
create this page (the controller)
Request: GET /hello/Texas!
Act 2 !
Request-Response
Our Mission: (should we choose to accept it)
!!
Understand the “request” and create a “response”
@weaverryan
The Request
@weaverryan
GET /hello/Texas?page=5 HTTP/1.1!Host: localhost:8000!Connection: keep-alive!Cache-Control: max-age=0!Accept: text/html,application/xhtml+xml!User-Agent: Mozilla/5.0!Cookie: PHPSESSID=abcdefg; has_js=1;
The client sends us a simple message that describes what they want
The Request
@weaverryan
GET /hello/Texas?page=5 HTTP/1.1!Host: localhost:8000!Connection: keep-alive!Cache-Control: max-age=0!Accept: text/html,application/xhtml+xml!User-Agent: Mozilla/5.0!Cookie: PHPSESSID=abcdefg; has_js=1;
The HTTP method
The URI
The client sends us a simple message that describes what they want
The Request
@weaverryan
The Request headersGET /hello/Texas?page=5 HTTP/1.1!Host: localhost:8000!Connection: keep-alive!Cache-Control: max-age=0!Accept: text/html,application/xhtml+xml!User-Agent: Mozilla/5.0!Cookie: PHPSESSID=abcdefg; has_js=1;
The client sends us a simple message that describes what they want
The Response
@weaverryan
HTTP/1.1 200 OK!Host: localhost:8000!Cache-Control: no-cache!Date: Wed, 23 Apr 2014 16:25:03 GMT!Content-Type: text/html;!!
Hello Texas
HTTP/1.1 200 OK!Host: localhost:8000!Cache-Control: no-cache!Date: Wed, 23 Apr 2014 16:25:03 GMT!Content-Type: text/html;!!
Hello Texas
The Response
@weaverryan
Response status code
The Response headers
The body
In PHP, the “request” message *explodes* into the “superglobals”
@weaverryan
To create the response, we use “header” and echo content
@weaverryan
@weaverryan
The Request in Silex
@weaverryan
The Response in Silex
Act 3 !
Namespaces & Autoloading
https://www.flickr.com/photos/chrisjeriko/8599248142
The controller can be any ol’ function
Controller as a method in a class
@weaverryan
Controller as a method in a class
@weaverryan
PHP Namespaces
@weaverryan
Namespaces give us longer class names: Drupal\acme\Controller\DemoController
PHP Namespaces
@weaverryan
Autoloading
@weaverryan
You don’t need to use require/include if: !
A. The namespace is the same as the directory
!
B. The class has the same name as the folder (+.php)
It’s called PSR-0
Act 4: !
Services and the “container”
Services == Useful Objects
@weaverryan
The container == the object that contains all the services
@weaverryan
In Silex, Symfony and Drupal 8, there is a “container”.
!
If you have it, you can use any service (useful object)
Can we use the Twig service to render a template?
@weaverryan
The “container” in SilexThe service “twig”
Request -> Response Framework
The Controller: Our code: constructs the page
Response: Hello Texas!@weaverryan
Container (with services)
Routing: Determine a function that can
create this page (the controller)
Request: GET /hello/Texas!
Act 5: !
Events
https://www.flickr.com/photos/bmp_creep/8064779382
Just like Drupal “hooks”, Silex has events
@weaverryan
“Hi! When event XXXXX happens, execute this
function. kthxbai”
@weaverryan
You can tell Silex:
Request -> Response Framework
The Controller: Our code: constructs the page
@weaverryan
Container (with services)
Event: kernel.controller
Events: kernel.view
kernel.response Response: Hello Texas!
Routing: Determine a function that can
create this page (the controller)
Request: GET /hello/Texas!
Event: kernel.request
@weaverryan
@weaverryan
Act 6: !
The Profiler
https://www.flickr.com/photos/fukagawa/415772853
Silex (because of Symfony) has a “profiler”
@weaverryan
@weaverryan
It has a lot of information, including
the “timeline”
@weaverryan https://www.flickr.com/photos/42andpointless/8062417131
@weaverryan
1) kernel.request event
2) Routing
3) Executes the controller
4) Our “listener” in kernel.view
Act 7: !
Everything is the same in Drupal 8
How can we create this in Drupal 8?
Thank you to my amigo Jesus Olivas for writing awesome blog posts
@jmolivas
jmolivas.com
2) Create routing
@jmolivas http://bit.ly/d8-hello
Name of the controller
acme.routing.yml
Module, Routing, Controller
@jmolivas http://bit.ly/d8-hello
These extra directories are going away soon \o/
@weaverryan
And there’s even a code generator already for all of this (and more)
Drupal 8 Console
https://drupal.org/project/console@jmolivas
Does Drupal 8 have a service container?
@weaverryan
The Container
Where you find the container could change
before Drupal 8 is finished
@weaverryan
@weaverryan
Yes there is a container !
And yes, it has all of the useful objects (services)
of Drupal
Are there events like in Silex?
@weaverryan
Yes! The same events exist and more!
1) Create a “listener” class
This is executed at the end of the request
!
We add JavaScript to each page on the site
2) Add a new service to the container
@weaverryan
Now, the container has a service called “acme.view_subscriber”
The event_subscriber tag says to Drupal that this service wants to be a “listener”
for some events
@weaverryan
And does the profiler exist?
@weaverryan
https://drupal.org/project/webprofiler
@weaverryan
https://drupal.org/project/webprofiler
@weaverryan
https://drupal.org/project/webprofiler
@weaverryan
https://drupal.org/project/webprofiler
@weaverryan
https://drupal.org/project/webprofiler
@weaverryan
https://drupal.org/project/webprofiler
Act 8 !
!
, &
Principal Themes
• Request/Response !
• Routing/Controller !
• PHP Namespaces/Autoloading !
• Services/Container
• Events/Listeners
• Profiler
@weaverryan
All are the same in Silex, Drupal & Symfony
You can use Silex to learn Drupal!
You can use Silex to learn Symfony!
You can use Symfony to learn Drupal!
https://www.flickr.com/photos/zzpza/3269784239
Finally, We have more tools to solve problems
PHP Tutorial Screencasts
Ryan Weaver @weaverryan
Thank you!
