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Symfony 4: it's a game changer. It's my favorite thing since chocolate milk. Honestly, I've never been so excited to start writing tutorials: you are going to love it!

But first, we need to talk about how you can upgrade to Symfony 4 so that all your projects can enjoy the goodness!

There are two big steps. First, well, of course, we need to actually upgrade our app to Symfony 4! And second, we need to update our project to support Symfony Flex. That is where things get interesting.

Upgrading does take some work. But don't worry: we'll walk through it together and learn a ton on the way.

Download the Course Code

As always, if you really want to get a handle on upgrading... or you just like chocolate milk, you should download the course code from this page and code along. Full disclosure: the download does not contain chocolate milk.

But, after you unzip it, it does contain a start/ directory with the same code you see here. Follow the README.md file for the steps needed to get your project running.

The last step will be to find your terminal and run:

./bin/console server:run

to start the built-in web server. Check it out at http://localhost:8000. Hello AquaNote! This is the Symfony 3.3 project that we've been building in our Symfony series.

Upgrading to Symfony 4

So: what's the first step to upgrading to Symfony 4? It's upgrading to 3.4! And that's delighyfully simple: Open composer.json, change the version of symfony/symfony to ^3.4, find your terminal and run:

68 lines composer.json
... lines 1 - 15
"require": {
... line 17
"symfony/symfony": "^3.4",
... lines 19 - 30
},
... lines 32 - 68 
composer update

And celebrate! So easy! By the way, you could just update symfony/symfony. But, honestly, it's just easier to upgrade everything. And since I keep responsible version constraints in composer.json, ahem, no dev-master or * versions, this is pretty safe and also means I get bug fixes, security fixes and new features.

And... hello Symfony 3.4! The best part? Ah, you guys already know it: thanks to Symfony's backwards-compatibility promise, our project will just work... immediately. Refresh! Yep! Welcome to Symfony 3.4.

Symfony 3.4 Versus Symfony 4.0

So why did we do this? Why not just skip directly to Symfony 4? Well, Symfony 3.4 and Symfony 4.0 are identical: they have the exact same features. The only difference is that all deprecated code paths are removed in 4.0.

On the web debug toolbar, you can see that this page contains 9 deprecated code calls. By upgrading to Symfony 3.4 first, we can hunt around and fix these. As soon as they're all gone... well, we'll be ready for Symfony 4!

Deprecation: Kernel::loadClassCache()

Click the icon to go see the full list of deprecations. Check out the first one: Kernel::loadClassCache() is deprecated since version 3.3. You can click "Show Trace" to see where this is coming from, but I already know!

Open web/app.php and web/app_dev.php. There it is! On line 28, remove the $kernel->loadClassCache() line. Do the same thing in app.php. Why is this deprecated? This originally gave your app a performance boost. But thanks to optimizations in PHP 7, it's not needed anymore. Less code, more speed, woo!

Deprecation: GuardAuthenticator::supports()

Close those files. What's next? Hmm, something about AbstractGuardAuthenticator::supports() is deprecated. Oh, and a recommendation! We should implement supports() inside our LoginFormAuthenticator.

Because I obsess over Symfony's development, I know what this is talking about. If you have more of a life than I do and are not already aware of every single little change, you should go to github.com/symfony/symfony and find the UPGRADE-4.0.md file. It's not perfect, but it contains explanations behind a lot of the changes and deprecations you'll see.

Go find the LoginFormAuthenticator in src/AppBundle/Security. We need to add a new method: public function supports() with a Request argument.

Copy the logic from getCredentials() that checks the URL, and just return it. Here's the deal: in Symfony 3, getCredentials() was called on every request. If it returned null, the authenticator was done: no other methods were called on it.

79 lines src/AppBundle/Security/LoginFormAuthenticator.php
... lines 1 - 15
class LoginFormAuthenticator extends AbstractFormLoginAuthenticator
{
... lines 18 - 30
public function supports(Request $request)
{
return $request->getPathInfo() == '/login' && $request->isMethod('POST');
}
... line 35
public function getCredentials(Request $request)
{
... lines 38 - 47
}
... lines 49 - 77
}

In Symfony 4, supports() is now called on every request instead. If it returns false, the authenticator is done like before. But if it returns true, then getCredentials() is called. We split the work of getCredentials() into two methods.

So, remove the logic at the top of it: we know this will only be called when the URL is /login and it's a POST request.

Deprecation: Quoting % in YAML

Most of the other deprecations are pretty easy, like the next one:

Not quoting the scalar %cache_type% starting with the "%" indicator character is deprecated since Symfony 3.1.

This, and the next deprecation are in config.yml - and it even tells us the exact lines!

Open up app/config/config.yml and find line 71. Yep! Put quotes around %cache_type%. To more closely follow the official YAML spec, if a value starts with %, it needs to have quotes around it. Do the same around the directory value.

80 lines app/config/config.yml
... lines 1 - 67
doctrine_cache:
providers:
my_markdown_cache:
type: '%cache_type%'
file_system:
directory: '%kernel.cache_dir%/markdown_cache'
... lines 74 - 80

Deprecation: logout_on_user_change

Back on the list, there is one more easy deprecation!

Not setting logout_on_user_change to true on firewall "main" is deprecated as of 3.4.

Copy that key. Then, open app/config/security.yml. Under the main firewall, paste this and set it to true.

41 lines app/config/security.yml
... lines 1 - 14
firewalls:
... lines 16 - 20
main:
... lines 22 - 29
logout_on_user_change: true
... lines 31 - 41

So, what the heck is this? Check it out: suppose you change your password while on your work computer. Previously, doing that did not cause you to be logged out on any other computers, like on your home computer. This was a security flaw, and the behavior was changed in Symfony 4. By turning this on, you can test to make sure your app doesn't have any surprises with that behavior.

Phew! Before we talk about the last deprecations, go back to the homepage and refresh. Yes! In 5 minutes our 9 deprecations are down to 2! Open up the list again. Interesting: it says:

Relying on service auto-registration for Genus is deprecated. Create a service named AppBundle\Entity\Genus instead.

That's weird... and involves changes to autowiring. Let's talk about those next!

Leave a comment!

  • 2020-03-12 Vladimir Sadicov

    Hey @oumaima

    Can you provide more details? What problem? What application? We will be glad to help you!

    Cheers!

  • 2020-03-12 oumaima

    hello i really have a big problem with my application and i would love some help
    Please halp!

  • 2020-01-30 Diego Aguiar

    Yeah, the structure changed considerably in Symfony4 and it's a manual process. If you keep watching the tutorial you will learn how Ryan handled it (and, of course, you can keep asking us questions :)

    Cheers!

  • 2020-01-29 mario

    Hi,
    thanks for your reply.
    Sorry, I did not explain myself. My 3.4 directory is:

    ├── app
    │ ├── AppCache.php
    │ ├── AppKernel.php
    │ ├── autoload.php
    │ ├── config
    │ │ ├── ...
    │ └── Resources
    │ ├── Public
    │ └── views
    ├── bin
    │ ├── console
    │ ├── php_errors.log
    │ └── symfony_requirements
    ├── composer.json
    ├── composer.lock
    ├──. ...
    ├── src
    │ └── MyBundle
    │ ├── BlogBundle (a custom bundle)
    │ │ ├── Controller
    │ │ ├── DependencyInjection
    │ │ ├── Entity
    │ │ ├── Form
    │ │ ├── JusBlogBundle.php
    │ │ ├── Repository
    │ │ ├── Resources (most view and public stuff is within these directories, for each bundle)

    │ │ └── Tests
    │ ├── ... several more bundles
    ├── var
    │ ├── ...
    ├── vendor
    │ ├── ...
    └── web
    ├── ...
    ├── bundles
    │ ├── jusblog -> ../../src/Jus/BlogBundle/Resources/public/
    │ ├── ... several more symlinks
    ├── config.php

    I modify composer.json, and >composer update; seems to work fine. But my web app does not work any more, since the directory structure remains the old one. I am not sure what the guideline are to move things around as to define the new structure.

    Thanks Cheers
    mario

  • 2020-01-29 Diego Aguiar

    Hey mario

    In symfony 4, the web directory got renamed to public but everything else is almost the same (inside that directory)

    Cheers!

  • 2020-01-29 mario

    HI
    just a quick question: how do I update the new directory structure? I did not have a public folder with Symfony 3.4, it seems I need it with Symfony 4.0.

    Thanks

    mario

  • 2019-07-03 Diego Aguiar

    Hey John Christensen

    You are right, Twig deprecations are other thing to consider but it has nothing to do with Symfony. You could even start a new Symfony project without Twig :)

    Cheers!

  • 2019-07-02 John Christensen

    It's probably worth noting that as of Twig 2.7 (roughly Mar 2019), users will get an additional deprecation warning after updating to Symfony 3.4:

    Using the "Twig_Extension" class is deprecated since Twig version 2.7, use "Twig\Extension\AbstractExtension" instead

    I don't think this affects anything else in the tutorial, however, since twig's deprecations (and development path) are independent of symfony's.

  • 2018-09-30 Tobias Ingold

    Thanks for clarifying.
    Have an awesome day :)

  • 2018-09-20 Diego Aguiar

    Hey Tobias Ingold

    In the video, Ryan was talking about Symfony's behavior but as you already investigated, Symfony4 requires PHP >=7.1.3 in order to work, so if you really can't upgrade to that version, then you should stick with Symfony 3.4 and eventually do the upgrade

    Here you can see all the requirements of Symfony3.4 https://github.com/symfony/...

    Cheers!

  • 2018-09-20 Tobias Ingold

    Hi

    You mentioned in the video that version 3.4 and 4 are identical. https://symfony.com/doc/cur... on this page from the symfony docs it says that symfony 4.0 requires PHP version 7.1.3 or higher. So as I understand, symfony 3.4 also requires at minimum PHP 7.1.3, correct? I am asking because the hosting I eventually want to deploy to can only run PHP 7.1.1 at this moment and upgrading to a higher version will not be possible for some time, maybe 6 months to a year.
    I intended to start developing on symfony 3.4 and eventually upgrade to 4, because this page from the docs states that 3.4 only requires PHP 5.5.9 to run: https://symfony.com/doc/3.4...

    I am a bit confused I must say :(

  • 2018-08-25 shing

    Cool, I see now. I should have check why $kernel->loadClassCache() exist in the 1st place.

    If anyone is interested. In the docs https://symfony.com/blog/ne....

    It says
    "Symfony provides three autoloaders via the ClassLoader component: two of them load classes that follow PSR-0 and PSR-4 standards and the other one uses a static map of classes and files. In addition, Symfony provides special wrappers for those loaders to add caching and debugging features."

    So i guess previous to symfony 4, it reorders ur code and stores it in var/cache, so that it loads properly, then bring it to opcache as precompiled script. In symfony 4 it goes straight to opcache. I think this is right?

    thanks for taking the time

  • 2018-08-24 weaverryan

    Hey!

    Great question! And actually, I wasn't sure myself :). So, I did some digging. Here is the source: https://github.com/symfony/...

    It appears that the optimizations were more related to the Composer optimized autoloader & OpCache. That issue doesn't mention the exact things in PHP 7 that really allowed this. So, unfortunately, I can't answer that question fully. A lot was optimized in PHP 7, so it could have been a number of things.

    Cheers!

  • 2018-08-24 shing

    Hi,

    "But thanks to optimizations in PHP 7, it's not needed anymore. Less code, more speed, woo!"
    Whats r the optimisations in php7 that dont require loadCacheClasses.

    Thanks in advance

  • 2018-04-10 Vlad

    Thank you!

  • 2018-04-10 Victor Bocharsky

    Hey Vlad,

    Ah, then probably the best would be:


        public function getCredentials(Request $request)
        {
            $extractor = new AuthorizationHeaderTokenExtractor(
                'Bearer',
                'Authorization'
            );

            $token = $extractor->extract($request);

            return [
                'token' => $token,
            ];
        }

    Actually, the same example you can see in docs: https://symfony.com/doc/cur...

    Cheers!

  • 2018-04-10 Vlad

    Thanks, Victor!
    There is only one minor detail. If you look at the PHPDoc for the getCredentials function in AuthenticatorInterface, it says the return value must be Any non-null value
    What should it be, if the $token is null?

  • 2018-04-10 Victor Bocharsky

    Hey Vlad,

    I think it may be refactored as:


    class JwtTokenAuthenticator extends AbstractGuardAuthenticator
    {
        public function supports(Request $request)
        {
            return $request->headers->has('Authorization');
        }

        public function getCredentials(Request $request)
        {
            $extractor = new AuthorizationHeaderTokenExtractor(
                'Bearer',
                'Authorization'
            );

            $token = $extractor->extract($request);
            if (!$token) {
                return null;
            }

            return $token;
        }
    }

    Cheers!

  • 2018-04-10 Victor Bocharsky

    Hey Dan,

    Ah, not an obvious problem :) Glad you found a problem!

    Cheers!

  • 2018-04-06 Vlad

    Hello,
    Going back to the REST tutorial, in case of JwtTokenAuthenticator what functionality would you put into supports supports() and how should getCredentials() be refactored?
    Thank you!

  • 2018-04-06 Dan Meigs

    Victor,

    I found the problem!!!! I had two controllers responding to the same path (one in each of the two bundles I was developing). Evidently that creates a routing loop. For some reason, Symfony 3.3 was just fine with that, but Symfony 3.4 was throwing errors. It looked like a problem with the upgrade, but it was a problem in my code that I was not aware of.

    So, life is good! Thanks for your help.

  • 2018-04-06 Victor Bocharsky

    OK, I see toy have this error on clear cache step.

    First of all, I let's bump "symfony/swiftmailer-bundle" constraint to "^2.6.4", I see you have lower one. Also, let's use "symfony/symfony": "3.4.*" to allow only patch updates and try again. If you see the same error, let's temporarily remove this line:
    Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache

    So, the idea is to achieve green composer update operation. Then you can probably debug it later why cache clear thrown an error.

    Btw, do you have any custom route loaders?

    Cheers!

  • 2018-04-05 Dan Meigs

    Victor,

    I followed those steps to no avail. I even cleared my composer cache and made it download all the packages again. No joy there either.

    I hope the following is enough information for you to see something I don't.

    Here's an excerpt from my composer.json file:


        "require": {
            "php": "^5.5.9|>=7.0.8",
            "behat/behat": "^3.4",
            "behat/mink-extension": "^2.2",
            "behat/mink-goutte-driver": "^1.2",
            "behat/mink-selenium2-driver": "^1.3",
            "braincrafted/bootstrap-bundle": "^2.2",
            "components/jquery": "^3.2",
            "doctrine/data-fixtures": "^1.2",
            "doctrine/doctrine-bundle": "^1.6",
            "doctrine/doctrine-cache-bundle": "^1.3",
            "doctrine/doctrine-fixtures-bundle": "^2.4",
            "doctrine/doctrine-migrations-bundle": "^1.2",
            "doctrine/orm": "^2.5",
            "easycorp/easyadmin-bundle": "^1.17",
            "egeloen/ckeditor-bundle": "^6.0",
            "friendsofsymfony/jsrouting-bundle": "^1.6",
            "friendsofsymfony/user-bundle": "^2.0",
            "gedmo/doctrine-extensions": "^2.4",
            "guzzlehttp/guzzle": "^6.3",
            "incenteev/composer-parameter-handler": "^2.0",
            "knplabs/knp-markdown-bundle": "^1.5",
            "knplabs/knp-paginator-bundle": "^2.6",
            "nelmio/cors-bundle": "^1.5",
            "sensio/distribution-bundle": "^5.0.19",
            "sensio/framework-extra-bundle": "^5.0.0",
            "sonata-project/admin-bundle": "^3.18",
            "sonata-project/core-bundle": "^3.4",
            "sonata-project/doctrine-orm-admin-bundle": "^3.1",
            "stof/doctrine-extensions-bundle": "^1.2",
            "symfony/assetic-bundle": "^2.8",
            "symfony/monolog-bundle": "^3.1.0",
            "symfony/polyfill-apcu": "^1.0",
            "symfony/serializer": "^3.3",
            "symfony/swiftmailer-bundle": "^2.3.10",
            "symfony/symfony": "^3.4",
            "twbs/bootstrap": "^3.3",
            "twig/twig": "^1.0||^2.0",
            "vich/uploader-bundle": "^1.7"
        },
        "require-dev": {
            "hautelook/alice-bundle": "^1.4",
            "liip/functional-test-bundle": "^1.8",
            "phpunit/dbunit": "^2.0",
            "phpunit/phpunit": "^5.7",
            "sensio/generator-bundle": "^3.0",
            "symfony/phpunit-bridge": "^3.0"
        },

    When I do composer update -vvv, I get this response:


    Resolving dependencies through SAT
    Dependency resolution completed in 4.433 seconds
    Analyzed 20318 packages to resolve dependencies
    Analyzed 2682107 rules to resolve dependencies
    Resolving dependencies through SAT
    Dependency resolution completed in 0.001 seconds
    Package operations: 0 installs, 2 updates, 0 removals
    Updates: symfony/symfony:v3.4.7, vich/uploader-bundle:1.8.2
      - Updating symfony/symfony (v3.3.16 => v3.4.7): Reading C:/Users/dmeigs.TLINENM/AppData/Local/Composer/files/symfony/symfony/857c1e0dee3406d607f3cd84dee2c6ecf877fb22.zip from cache
    Loading from cache Extracting archive
        REASON: Required by the root package: Install command rule (install symfony/symfony v3.3.16|install symfony/symfony 3.3.x-dev|install symfony/symfony 3.4.x-dev|install symfony/symfony v3.4.0|install symfony/symfony v3.4.0-BETA1|install symfony/symfony v3.4.0-BETA2|install symfony/symfony v3.4.0-BETA3|install symfony/symfony v3.4.0-BETA4|install symfony/symfony v3.4.0-RC1|install symfony/symfony v3.4.0-RC2|install symfony/symfony v3.4.1|install symfony/symfony v3.4.2|install symfony/symfony v3.4.3|install symfony/symfony v3.4.4|install symfony/symfony v3.4.5|install symfony/symfony v3.4.6|install symfony/symfony v3.4.7|install symfony/serializer 3.3.x-dev|install symfony/serializer 3.4.x-dev|install symfony/serializer v3.3.0|install symfony/serializer v3.3.0-BETA1|install symfony/serializer v3.3.0-RC1|install symfony/serializer v3.3.1|install symfony/serializer v3.3.10|install symfony/serializer v3.3.11|install symfony/serializer v3.3.12|install symfony/serializer v3.3.13|install symfony/serializer v3.3.14|install symfony/serializer v3.3.15|install symfony/serializer v3.3.16|install symfony/serializer v3.3.2|install symfony/serializer v3.3.3|install symfony/serializer v3.3.4|install symfony/serializer v3.3.5|install symfony/serializer v3.3.6|install symfony/serializer v3.3.7|install symfony/serializer v3.3.8|install symfony/serializer v3.3.9|install symfony/serializer v3.4.0|install symfony/serializer v3.4.0-BETA1|install symfony/serializer v3.4.0-BETA2|install symfony/serializer v3.4.0-BETA3|install symfony/serializer v3.4.0-BETA4|install symfony/serializer v3.4.0-RC1|install symfony/serializer v3.4.0-RC2|install symfony/serializer v3.4.1|install symfony/serializer v3.4.2|install symfony/serializer v3.4.3|install symfony/serializer v3.4.4|install symfony/serializer v3.4.5|install symfony/serializer v3.4.6|install symfony/serializer v3.4.7)

      - Updating vich/uploader-bundle (1.7.1 => 1.8.2): Reading C:/Users/dmeigs.TLINENM/AppData/Local/Composer/files/vich/uploader-bundle/fa3d5fafebc3c184efe63f1f1ba1056fb7464ac0.zip from cache
    Loading from cache Extracting archive
        REASON: Required by the root package: Install command rule (install vich/uploader-bundle 1.7.1|install vich/uploader-bundle 1.7.0|install vich/uploader-bundle 1.7.1|install vich/uploader-bundle 1.8.0|install vich/uploader-bundle 1.8.1|install vich/uploader-bundle 1.8.2|install vich/uploader-bundle 1.8.x-dev)

    Reading C:\Users\dmeigs.TLINENM\Documents\websites\AYSOUnited/vendor/composer/installed.json
    Reading ./composer.lock
    Writing lock file
    Generating autoload files
    Reading ./composer.lock
    ocramius/package-versions:  Generating version class...
    > post-update-cmd: @symfony-scripts
    ocramius/package-versions: ...done generating version class
    > symfony-scripts: Incenteev\ParameterHandler\ScriptHandler::buildParameters
    Updating the "app/config/parameters.yml" file
    > symfony-scripts: Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap
    > symfony-scripts: Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache

    In Container.php line 297:

      Circular reference detected for service "routing.loader", path: "routing.loader".


    cache:clear [--no-warmup] [--no-optional-warmers] [-h|--help] [-q|--quiet] [-v|vv|vvv|--verbose] [-V|--version] [--ansi] [--no-ansi] [-n|--no-interaction] [-e|--env ENV] [--no-debug] [--] <command>

    Script Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache handling the symfony-scripts event terminated with an exception


      [RuntimeException]
      An error occurred when executing the ""cache:clear --no-warmup"" command:




      In Container.php line 297:

        Circular reference detected for service "routing.loader", path: "routing.loader".


      cache:clear [--no-warmup] [--no-optional-warmers] [-h|--help] [-q|--quiet] [-v|vv|vvv|--verbose] [-V|--version] [--
      ansi] [--no-ansi] [-n|--no-interaction] [-e|--env ENV] [--no-debug] [--] <command>


    Exception trace:
     () at C:\Users\dmeigs.TLINENM\Documents\websites\AYSOUnited\vendor\sensio\distribution-bundle\Composer\ScriptHandler.php:293
     Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::executeCommand() at C:\Users\dmeigs.TLINENM\Documents\websites\AYSOUnited\vendor\sensio\distribution-bundle\Composer\ScriptHandler.php:143
     Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/EventDispatcher/EventDispatcher.php:282
     Composer\EventDispatcher\EventDispatcher->executeEventPhpScript() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/EventDispatcher/EventDispatcher.php:205
     Composer\EventDispatcher\EventDispatcher->doDispatch() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/EventDispatcher/EventDispatcher.php:81
     Composer\EventDispatcher\EventDispatcher->dispatch() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/EventDispatcher/EventDispatcher.php:189
     Composer\EventDispatcher\EventDispatcher->doDispatch() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/EventDispatcher/EventDispatcher.php:96
     Composer\EventDispatcher\EventDispatcher->dispatchScript() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Installer.php:322
     Composer\Installer->run() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Command/UpdateCommand.php:161
     Composer\Command\UpdateCommand->execute() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/vendor/symfony/console/Command/Command.php:242
     Symfony\Component\Console\Command\Command->run() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/vendor/symfony/console/Application.php:842
     Symfony\Component\Console\Application->doRunCommand() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/vendor/symfony/console/Application.php:193
     Symfony\Component\Console\Application->doRun() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Console/Application.php:251
     Composer\Console\Application->doRun() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/vendor/symfony/console/Application.php:117
     Symfony\Component\Console\Application->run() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/src/Composer/Console/Application.php:100
     Composer\Console\Application->run() at phar://C:/ProgramData/ComposerSetup/bin/composer.phar/bin/composer:58
     require() at C:\ProgramData\ComposerSetup\bin\composer.phar:24

    Thanks!

  • 2018-04-05 Victor Bocharsky

    Hey Dan,

    Sometimes upgrading is a bit tricker than just Symfony constraint tweaking to 3.4. First of all, try to compare the original composer.json file for 3.4 branch and tweak other constraints of core deps as well according to it: https://github.com/symfony/...

    Also, try to manually remove folders from var/cache/* like dev/, prod/, test/, etc.

    Then run composer update again, probably it helps. If not, try to make the output more verbose with:
    composer update -vvv

    It should give you more context to find the root of the problem. If you still cannot handle it - show us the verbose output with "-vvv" option and we'll try to help you.

    Cheers!

  • 2018-04-04 Dan Meigs

    Hey guys,

    I had a working site at version 3.3.16. When I upgraded to 3.4 by changing the version number in composer.json and executing composer update, I got the following cryptic error message: "Circular reference detected for service "routing.loader", path: "routing.loader".

    How do I find and fix that problem?

  • 2018-02-21 Victor Bocharsky

    Hey Billias,

    Yep, I totally understand you, we have Webpack dev-server too so I always have a few tabs for one project :)

    And thanks for the kind words about KnpU screencasts, we're working hard on releasing new important updates as soon as we can.

    Cheers!

  • 2018-02-19 Billias McPappas

    Hey,

    it truly is a nice tool for windows users. My current development stack is 1 Symfony website & one Symfony API. So i need two consoles for the dev servers, two more for executing console commands etc, and a fifth (!) for running my front-end (i am using webpack dev server). So after spending a lot of time changing between consoles, i found my peace with this one!

    Thanks for KnpU though, it is also a life-saver when it comes to get a grasp on what is going on with new Symfony versions!

  • 2018-02-19 Victor Bocharsky

    Hey Billias,

    Hm, looks like a great tip, so I'll thank you now ;) Thanks for the help!

    Cheers!

  • 2018-02-19 Billias McPappas

    If you are using Windows, check a tool called ConEmu. Besides colors and stuff, it allows multiple tabs in single console, and even search functionality.

    Check it out, and thank me later :D

  • 2018-02-12 Victor Bocharsky

    Great! Thanks for sharing it with others :)

    Cheers!

  • 2018-02-06 kribo

    Got it to work..

    OS = Win10 pro => had to install ANSICON from
    1- https://github.com/adoxa/an....
    2- open cmd and navigate to the unzipped folder
    3- Navigate to x64 (if you have a 64 bit machine) otherwise navigate to x86
    4- Type ansicon.exe -h and you will get the following:
    D:\Data\ansicon\x86>ansicon.exe -h

    And bingo it works I've now also got a green bar when I run the server....lol

  • 2018-02-06 Victor Bocharsky

    Hey @kribo,

    Haha, it depends :) Btw, what OS you are on? Somehow your terminal does not allow ansi output by default. Well, you can try to force ANSI output with --ansi flag, for example, Composer has this option, so try:

    $ composer --ansi

    Do you see color output now? The same for Symfony commands, i.e. bin/console, try to add --ansi flasg to force ANSI output. What terminal do you use? I think you can configure your terminal to always support ANSI output and you won't need to pass that flag.

    Cheers!

  • 2018-02-05 kribo

    How does one get the color green in the command prompt ??
    All I get is Black & White and I'm a bit jealous. Do I need to buy a Mac?

  • 2018-01-04 Victor Bocharsky

    Hey Nan,

    You're right, there's no config.yml anymore, it was splitted to separate files, that's why you need to create it "doctrine_cache.yaml" file manually inside "config/packages/". Actually, this question is duplicated, so look at my original answer:
    https://knpuniversity.com/s...

    Cheers!

  • 2018-01-03 Nan Zhao

    In the lastest version of symfony3, the config.yml is not generated by using 'composer create-project symfony/skeleton 3.4'. I tried to load the file "doctrine_cache.yaml", but failed. When I type 'php ./bin/console dubug:container markdown_cache', the command line says 'In ContainerDebugCommand.php line 211: No services found that match "markdown_cache". How can I create a custom server? Can you help me ?

  • 2018-01-02 Victor Bocharsky

    Hey Shing,

    I agree, it's not trivial, but that's the price to increase code quality and make development more smooth. However, Symfony devs made all their best to make this upgrading process very smooth, thanks to cool deprecation notices feature.

    Cheers!

  • 2017-12-30 shing

    Hi Victor, Glad I know I'm not mad. I'm rather new at this. I guess documentation might not always be accurate. Also the change from symfony 3 to 4 does not seem trival.

    Thanks for help :)

  • 2017-12-29 Victor Bocharsky

    Hey Shing,

    Good catch! Actually, it's impossible to require symfony/symfony due to this line: https://github.com/symfony/... . As you can see, it forbids installation of symfony/symfony. I'm not sure about the reasons behind, but I think it's kind of bug in Symfony docs. I opened an issue about it here: https://github.com/symfony/...

    So, the only way I see is to install all the deps manually obviously specifying them in composer.json. Actually, it's not a best practice to install all the Symfony components to your project when you don't use them *all*. And probably in most cases you won't use them all :)

    Cheers!

  • 2017-12-28 shing

    Hi weaverryan,

    I install the a fresh symfony 4 with composer create-project symfony/skeleton
    Everything seems to be ok. So I want to install all components. The symfony site (https://symfony.com/doc/cur... says to composer require symfony/symfony

    I get an error
    Your requirements could not be resolved to an installable set of packages.
    Problem 1
    - symfony/symfony v4.0.0 conflicts with __root__[No version set (parsed as 1.0.0)].
    - symfony/symfony v4.0.1 conflicts with __root__[No version set (parsed as 1.0.0)].
    - symfony/symfony v4.0.2 conflicts with __root__[No version set (parsed as 1.0.0)].
    - Installation request for __root__ No version set (parsed as 1.0.0) -> satisfiable by __root__[No version set (parsed as 1.0.0)].
    - Installation request for symfony/symfony ^4.0 -> satisfiable by symfony/symfony[v4.0.0, v4.0.1, v4.0.2].

    My composer is of the latest version 1.5.6

    Am I doing something wrong?
    Thxs.

  • 2017-12-19 weaverryan

    Ah yes, you started a new project - I'm aware of that bug you linked to. But, I'm glad it's working now - I'm not sure if your code contains that fix or not - but I wouldn't worry about it unless it comes up again :).

    Cheers!

  • 2017-12-19 J.R. Jenkins

    So I am apparently crazy or had some other bug that I didn't realize, as I uncommented those lines, cleared my caches, and there is no error... sorry for the red herring.

  • 2017-12-19 J.R. Jenkins

    weaverryan I did get an error, although I will have to look it up when I get back to work in the morning, that actually led me to this discussion in the Symfony issue queue, https://github.com/symfony/.... Basically I had started with a 3.4 install and was slowly developing things out, but when trying to access the site through app.php it would crash with what I believe was the "Cannot redeclare class Symfony\Bundle\FrameworkBundle\Controller\ControllerNameParser" error

    Commenting out both the include for bootstrap.php and call to loadClassCache resolved the issue, but that didn't seem right. I was going to dig into when I saw you were releasing this course so I thought I would see what you all had to say :-)

  • 2017-12-19 weaverryan

    Hey J.R. Jenkins!

    Ah, stuck on PHP 5 - I understand it, but bummer! So, if you're stuck on PHP 5, then you're also stuck in Symfony 3.4 for now. This basically means that, until you're ready to upgrade to Symfony 4, you should just ignore the loadClassCache() stuff (i.e. LEAVE them - don't remove them). You mentioned you're having "errors" - you should only have deprecation warnings. Are you getting actual errors with loadClassCache()?

    Cheers!

  • 2017-12-19 J.R. Jenkins

    Besides upgrading to PHP 7, what would you recommend people who are stuck on PHP 5.5.9 do in regards to the ```Kernel::loadClassCache()``` call? For internal reasons we have several apps that are still on Ubuntu 14.04 LTS versions and the systems administrators prefer to install PHP via APT, so we are limited on upgrading. I see that it looks like in a new Symfony 3.4 install they wrap this in a ```if (PHP_VERSION_ID < 70000) {}``` block, but I still had errors when I tried to load with that. Any recommendations?

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