即使使用PHP 7.2，Composer也会安装symfony 3.4而不是4.x.

Question

我在Ubuntu 16.04.6 LTS + Plesk 17.8.11安装了几个PHP版本（7.0,7.1和7.2）即使我在.bashrc文件中设置了以下行：

alias php='/opt/plesk/php/7.2/bin/php'

我检查（用php -v）当前的PHP版本实际上是7.2

但是当我运行这条线时：

作曲家创建项目symfony / website-skeleton my-project

我仍然有Symfony 3.4而不是4.x.

:(

这是“composer create-project symfony / website-skeleton myproject”命令行之后的composer.json文件：

{
    "type": "project",
    "license": "proprietary",
    "require": {
        "php": "^7.0.8",
        "ext-ctype": "*",
        "ext-iconv": "*",
        "sensio/framework-extra-bundle": "^5.1",
        "symfony/asset": "3.4.*",
        "symfony/console": "3.4.*",
        "symfony/dotenv": "3.4.*",
        "symfony/expression-language": "3.4.*",
        "symfony/flex": "^1.1",
        "symfony/form": "3.4.*",
        "symfony/framework-bundle": "3.4.*",
        "symfony/monolog-bundle": "^3.1",
        "symfony/orm-pack": "*",
        "symfony/process": "3.4.*",
        "symfony/security-bundle": "3.4.*",
        "symfony/serializer-pack": "*",
        "symfony/swiftmailer-bundle": "^3.1",
        "symfony/translation": "3.4.*",
        "symfony/twig-bundle": "3.4.*",
        "symfony/validator": "3.4.*",
        "symfony/web-link": "3.4.*",
        "symfony/yaml": "3.4.*"
    },
    "require-dev": {
        "symfony/debug-pack": "*",
        "symfony/maker-bundle": "^1.0",
        "symfony/profiler-pack": "*",
        "symfony/test-pack": "*",
        "symfony/web-server-bundle": "3.4.*"
    },
    "config": {
        "preferred-install": {
            "*": "dist"
        },
        "sort-packages": true
    },
    "autoload": {
        "psr-4": {
            "App\\": "src/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "App\\Tests\\": "tests/"
        }
    },
    "replace": {
        "paragonie/random_compat": "2.*",
        "symfony/polyfill-ctype": "*",
        "symfony/polyfill-iconv": "*",
        "symfony/polyfill-php70": "*",
        "symfony/polyfill-php56": "*"
    },
    "scripts": {
        "auto-scripts": {
            "cache:clear": "symfony-cmd",
            "assets:install %PUBLIC_DIR%": "symfony-cmd"
        },
        "post-install-cmd": [
            "@auto-scripts"
        ],
        "post-update-cmd": [
            "@auto-scripts"
        ]
    },
    "conflict": {
        "symfony/symfony": "*"
    },
    "extra": {
        "symfony": {
            "allow-contrib": false,
            "require": "3.4.*"
        }
    }
}

Answer 1

以下解决方案适用于我：由于Composer将始终在服务器上使用默认的PHP版本，因此请创建别名：alias composer ='/ opt / plesk / php / 7.2 / bin / php /usr/lib/plesk-9.0 /composer.phar'然后Composer将安装Symfony 4.x！