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Symfony 2.8到3.0迁移

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我想将 symfony 2.8 项目升级到 3.0 ，我将 composer.json 中的版本更改为 3.0.* 但是在完成作曲家更新后，我在控制台中出现以下错误：

[RuntimeException]执行“'cache：clear --no-warmup'”命令时发生错误：PHP致命错误：/ var / www / html / t /中找不到类'Symfony \ Component \ HttpKernel \ Kernel'第6行的EcoPro / app / AppKernel.php

php symfony migration

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    听起来你的代码无法从Symfony找到Kernel类 . 既然它应该仍然存在，正如你在_1273166中看到的那样，我认为在你的更新期间出了问题 .

    我建议先运行 composer diagnose ，看看作曲家本身是否是最新的，你的 composer.json 在语法上是否有效 . 下一步，您应该通过运行 composer show 来验证依赖项的当前版本 . 输出应该如下所示：

    $ composer show
doctrine/annotations                 v1.2.7  Docblock Annotations Parser
doctrine/cache                       v1.5.1  Caching library offering an object-oriented API for many cache backends
doctrine/collections                 v1.3.0  Collections Abstraction library
doctrine/common                      v2.5.1  Common Library for Doctrine projects
doctrine/dbal                        v2.5.2  Database Abstraction Layer
doctrine/doctrine-bundle             1.6.0   Symfony DoctrineBundle
doctrine/doctrine-cache-bundle       1.2.2   Symfony Bundle for Doctrine Cache
doctrine/inflector                   v1.1.0  Common String Manipulations with regard to casing and singular/plural rules.
doctrine/instantiator                1.0.5   A small, lightweight utility to instantiate objects in PHP without invoking their constructors
doctrine/lexer                       v1.0.1  Base library for a lexer that can be used in Top-Down, Recursive Descent Parsers.
doctrine/orm                         v2.5.2  Object-Relational-Mapper for PHP
incenteev/composer-parameter-handler v2.1.2  Composer script handling your ignored parameter file
jdorn/sql-formatter                  v1.2.17 a PHP SQL highlighting library
monolog/monolog                      1.17.2  Sends your logs to files, sockets, inboxes, databases and various web services
paragonie/random_compat              1.1.0   PHP 5.x polyfill for random_bytes() and random_int() from PHP 7
psr/log                              1.0.0   Common interface for logging libraries
sensio/distribution-bundle           v5.0.2  Base bundle for Symfony Distributions
sensio/framework-extra-bundle        v3.0.11 This bundle provides a way to configure your controllers with annotations
sensio/generator-bundle              v3.0.0  This bundle generates code for you
sensiolabs/security-checker          v3.0.2  A security checker for your composer.lock
swiftmailer/swiftmailer              v5.4.1  Swiftmailer, free feature-rich PHP mailer
symfony/monolog-bundle               v2.8.2  Symfony MonologBundle
symfony/phpunit-bridge               v2.8.0  Symfony PHPUnit Bridge
symfony/polyfill-intl-icu            v1.0.0  Symfony polyfill for intl's ICU-related data and classes
symfony/polyfill-mbstring            v1.0.0  Symfony polyfill for the Mbstring extension
symfony/polyfill-php56               v1.0.0  Symfony polyfill backporting some PHP 5.6+ features to lower PHP versions
symfony/polyfill-php70               v1.0.0  Symfony polyfill backporting some PHP 7.0+ features to lower PHP versions
symfony/polyfill-util                v1.0.0  Symfony utilities for portability of PHP codes
symfony/swiftmailer-bundle           v2.3.9  Symfony SwiftmailerBundle
symfony/symfony                      v3.0.0  The Symfony PHP framework
twig/twig                            v1.23.1 Twig, the flexible, fast, and secure template language for PHP

    这应该可以帮助您查看更新是否确实有效 . 如果一切看起来都很好，我会走安全路线并将你的代码恢复到2.8，然后像下面解释的那样进行更新，而不是更改composer.json！

    首先确保修复了现有应用程序中的所有弃用 . 您可以使用UPGRADE-document作为参考，但也可以运行测试和check the logs for deprecated calls . 使用3.3会变得更容易，因为这些版本有一个单独的deprecation-log，您可以在 var/log 中找到其他日志文件 .

    一旦你有理由确定代码将使用新的主要版本运行，只需使用以下composer命令：

    composer require symfony/lts:"^3.0"

    这只是为了确保我们在此过程中不会意外安装任何4.0的Symfony组件 . 一旦您想升级到Symfony 4，您可以使用 composer remove symfony/lts 删除此依赖关系，然后运行update .

    在lts元软件包到位后，您可以更新Symfony本身：

    composer require symfony/symfony:^3.0

    如果您真的想要一步一步地更新到您的依赖项支持的最新3.x或使用更严格的约束：

    composer require symfony/symfony:3.0.*

    如果您愿意，您也可以一步完成这两件事：

    $ composer require symfony/lts:^3.0 symfony/symfony:^3.0
./composer.json has been updated
Loading composer repositories with package information
Updating dependencies (including require-dev)
Package operations: 5 installs, 2 updates, 0 removals
- Updating symfony/symfony (v2.8.32 => v3.4.2): Downloading (100%)
- Installing psr/simple-cache (1.0.0): Loading from cache
- Installing psr/link (1.0.0): Loading from cache
- Installing psr/container (1.0.0): Loading from cache
- Installing psr/cache (1.0.1): Loading from cache
- Installing fig/link-util (1.0.0): Loading from cache
Writing lock file
Generating autoload files
> Incenteev\ParameterHandler\ScriptHandler::buildParameters
Updating the "app/config/parameters.yml" file
> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap
> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache

// Clearing the cache for the dev environment with debug
// true


[OK] Cache for the "dev" environment (debug=true) was successfully cleared.


> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installAssets

Trying to install assets as relative symbolic links.


[OK] No assets were provided by any bundle.


> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installRequirementsFile
> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::prepareDeploymentTarget

    这应该足以让Symfony在新版本上使用 . 您可能还有其他依赖项，例如Doctrine或您安装的一些bundle . 有一些有用的命令可用于更新它们 .

    首先，您一次只能更新一个依赖项：

    composer update doctrine/orm

    当您添加选项 --with-dependencies 时，它还将更新doctrine / orm的依赖项 .

    您始终可以使用依赖项和可选的版本来询问 composer why 或 composer why-not ，以检查依赖项存在的原因以及它不会更新的原因 . 只需输入 composer help why-not 即可查看如何使用它 . 当您想要更新诸如doctrine / orm之类的依赖项时，这尤其有用，但是composer会抛出一个无法执行此操作的错误 .

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