symfony - Symfony2 LTS：如何从 2.3 升级到 2.7？

Question

Symfony 2.7 于2015 年 4 月 30 日发布，是2.3 版本之后的当前 LTS（长期支持）版本。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的一年内将发布安全修复程序。

正如Massimiliano Arione 在公告评论中所建议的那样，从 Symfony 2.3 从 2.7 升级而无需检查所有小升级（2.3 → 2.4、2.4 → 2.5 等）需要进行哪些更改？

score 26 · Accepted Answer

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的变化。

为了将你的应用从 Symfony 2.3 升级到 Symfony 2.7，你必须更新你的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"
        }
    }
}

概括：

Symfony 版本更新
PSR-4被用来代替PSR-0
twig/extensions默认不安装，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",已被删除

更新composer.json文件后，您必须更新依赖项：

composer update --prefer-dist -vv

然后你可能需要刷新缓存：

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

注意：我使用以下命令来获取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因为我们想要最新版本（2.3.31今天）而不是初始版本（2.3.0））

diff 也可以在GitHub 上找到，但是composer.jsonSymfony 2.3 的文件已经更新了多次，所以它可能与你的文件不同。

symfony - Symfony2 LTS：如何从 2.3 升级到 2.7？

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