Symfony2 LTS：如何从 2.3 升级到 2.7？

Question

Symfony 2.7 是 released on 30th April 2015 and is the current LTS (Long Term Support) version after the 2.3 version。 Symfony 2.3 的这些版本的维护将于 2016 年 5 月结束，Symfony 2.7 的维护将于 2018 年 5 月结束。两个版本的维护结束后一年内将发布安全修复程序。

根据 Massimiliano Arione in the announce comments 的建议，从 Symfony 2.7 升级到 2.3 需要做哪些更改，而无需检查所有次要升级（2.3 → 2.4、2.4 → 2.5 等）？

Answer 1

正如 Med 在评论中提醒的那样，Symfony2 开发人员已尝试在 2.x 分支中保持向后兼容性。所以只要你以后不想切换到 3.0 分支，你可以忽略 2.3 和 2.7 之间的变化，因为它们大多是弃用变化。

为了将您的应用程序从 Symfony 2.3 升级到 Symfony 2.7，您必须更新您的 composer.json 文件：

([…]表示代码不变)

旧（2.3）版本：

{
    […]
    "autoload": {
        "psr-0": { "": "src/" }
    },
    "require": {
        "php": ">=5.3.3",
        "symfony/symfony": "2.3.*",
        "doctrine/orm": "~2.2,>=2.2.3,<2.5",
        "doctrine/dbal": "<2.5",
        "doctrine/doctrine-bundle": "~1.2",
        "twig/extensions": "1.0.*",
        "symfony/assetic-bundle": "~2.3",
        "symfony/swiftmailer-bundle": "~2.3",
        "symfony/monolog-bundle": "~2.4",
        "sensio/distribution-bundle": "~2.3",
        "sensio/framework-extra-bundle": "~3.0,>=3.0.2",
        "sensio/generator-bundle": "~2.3",
        "incenteev/composer-parameter-handler": "~2.0"
    },
    "scripts": {
        "post-install-cmd": [
            "Incenteev\ParameterHandler\ScriptHandler::buildParameters",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installAssets",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installRequirementsFile",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::prepareDeploymentTarget"
        ],
        "post-update-cmd": [
            "Incenteev\ParameterHandler\ScriptHandler::buildParameters",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installAssets",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installRequirementsFile",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::prepareDeploymentTarget"
        ]
    },
    […]
    "minimum-stability": "stable",
    "extra": {
        […]
        "incenteev-parameters": {
            "file": "app/config/parameters.yml"
        },
        "branch-alias": {
            "dev-master": "2.3-dev"
        }
    }
}

新（2.7）版本：

{
    […]
    "autoload": {
        "psr-4": { "": "src/", "SymfonyStandard\": "app/SymfonyStandard/" }
    },
    "require": {
        "php": ">=5.3.9",
        "symfony/symfony": "2.7.*",
        "doctrine/orm": "^2.4.8",
        "doctrine/doctrine-bundle": "~1.4",
        "symfony/assetic-bundle": "~2.3",
        "symfony/swiftmailer-bundle": "~2.3",
        "symfony/monolog-bundle": "~2.4",
        "sensio/distribution-bundle": "~4.0",
        "sensio/framework-extra-bundle": "^3.0.2",
        "incenteev/composer-parameter-handler": "~2.0"
    },
    "require-dev": {
        "sensio/generator-bundle": "~2.3",
        "symfony/phpunit-bridge": "~2.7"
    },
    "scripts": {
        "post-install-cmd": [
            "Incenteev\ParameterHandler\ScriptHandler::buildParameters",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installAssets",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installRequirementsFile",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::removeSymfonyStandardFiles",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::prepareDeploymentTarget"
        ],
        "post-update-cmd": [
            "Incenteev\ParameterHandler\ScriptHandler::buildParameters",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installAssets",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::installRequirementsFile",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::removeSymfonyStandardFiles",
            "Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::prepareDeploymentTarget"
        ]
    },
    […]
    "extra": {
        […]
        "symfony-assets-install": "relative",
        […]
        "branch-alias": {
            "dev-master": "2.7-dev"
        }
    }
}

总结：

Symfony 版本已更新
PSR-4 代替 PSR-0
twig/extensions默认没有安装，如果使用Twig扩展可能需要添加
sensio/generator-bundle 仅在 dev 环境中需要
scripts部分已更新
"minimum-stability": "stable", 已删除

更新 composer.json 文件后，您必须更新依赖项：

composer update --prefer-dist -vv

那么您可能需要刷新缓存：

php app/console cache:clear --env=dev

注意：我使用了以下命令来获取 composer.json 文件：

# create Symfony "2.3.*" project in the "2.3" directory
composer create-project symfony/framework-standard-edition "2.3" "2.3.*" --no-interaction -v
# create Symfony "2.7.*" project in the "2.7" directory
composer create-project symfony/framework-standard-edition "2.7" "2.7.*" --no-interaction -v
# compare the Symfony 2.3 and 2.7 composer.json files
diff -u 2.3/composer.json 2.7/composer.json

（我们使用 2.3.* 而不是 2.3 因为我们想要最后一个版本（2.3.31 今天）而不是初始版本（2.3.0））

差异在GitHub也可用，但是Symfony 2.3的composer.json文件已经更新了多次，所以它可能与你的文件。

Symfony2 LTS：如何从 2.3 升级到 2.7？

Symfony2 LTS: how to upgrade from 2.3 to 2.7?

upgrade

symfony

symfony-2.3

symfony-2.7