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，是继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。两个版本的安全补丁将在维护结束后的一年内发布。

正如Massimiliano Arione在公告评论中所建议的那样，从Symfony 2.3升级到2.7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在评论中所提醒的那样，Symfony2开发人员已经尝试在<代码>2中保持向后兼容性。x分支。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，因为它们大多是弃用更改。

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

（<代码>[…]表示代码未更改）

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
• 使用PSR-4代替PSR-0
• 默认情况下未安装twig/extensions，如果使用twig extensions，可能需要添加它
• 只有在开发环境中才需要sensio/generator捆绑包
• 脚本部分已更新
• “最小稳定性”：“稳定”，已删除

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：我使用了以下命令来获取作曲家。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，因为我们想要的是最新版本（今天的2.3.31），而不是初始版本（2.3.0）

diff也可以在GitHub上使用，但是composer。Symfony 2.3的json文件已多次更新，因此可能与您的文件不同。