Question

Symfony 2.7是released on 30th April 2015，是current LTS (Long Term Support) version after the 2.3 version。这些版本的维护将于2016年5月针对Symfony 2.3和2018年5月针对Symfony 2.7进行。安全修复程序将在两个版本的维护结束后一年内发布。

根据Massimiliano Arione in the announce comments的建议，从Symfony 2.3升级到2.7需要进行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开发人员试图在2.x分支中保持向后兼容性。因此，只要您以后不想切换到3.0分支，就可以忽略2.3和2.7之间的更改，因为它们主要是弃用更改。

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

（[…]表示代码不变）

旧版本（2.3）：

{
    […]
    "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"
        }
    }
}

新版（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"
        }
    }
}

要点：

Symfony版本已更新
PSR-4代替PSR-0
twig/extensions，如果您使用Twig扩展，则可能需要添加

sensio/generator-bundle

dev
scripts部分已更新
"minimum-stability": "stable",已被删除

更新 composer.json 文件后，必须更新依赖项：

composer update --prefer-dist -vv

然后您可能需要刷新缓存：

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

（我们使用的是2.3.*而不是2.3，因为我们需要最新版本（今天2.3.31而不是初始版本（2.3.0））

差异在GitHub也可用，但Symfony 2.3的 composer.json 文件已多次更新，因此可能与您的文件不同。

Symfony2 LTS：如何从2.3升级到2.7？

1 个答案: