将laravel从laravel 5.4更新为laravel 5.5

Question

我正在尝试从5.4版升级到5.5版。我已经做了所有的指示，从拉拉指南：https://laravel.com/docs/master/upgrade

当我尝试使用命令时：

composer update

结果是：

Loading composer repositories with package information
Updating dependencies (including require-dev)
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - The requested package laravel/framework 5.5.* is satisfiable by laravel/framework[5.5.x-dev] but these conflict with your requirements or minimum-stability.

下面我展示了composer.json文件：

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=5.6.4",
        "doctrine/dbal": "^2.5",
        "intervention/image": "^2.3",
        "laravel/framework": "5.5.*",
        "laravel/tinker": "~1.0",
        "laravelcollective/html": "^5.4.0",
        "unisharp/laravel-filemanager": "^1.7"
    },
    "require-dev": {
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "0.9.*",
        "phpunit/phpunit": "~6.0"
    },
    "autoload": {
        "classmap": [
            "database"
        ],
        "psr-4": {
            "artSite\\": "app/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "scripts": {
        "post-root-package-install": [
            "php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "php artisan key:generate"
        ],
        "post-install-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postInstall",
            "php artisan optimize"
        ],
        "post-update-cmd": [
            "Illuminate\\Foundation\\ComposerScripts::postUpdate",
            "php artisan optimize"
        ]
    },
    "config": {
        "preferred-install": "dist",
        "sort-packages": true
    }
}

我会很乐意寻求帮助的。诚挚的问候

Answer 1

正如错误消息中所述，Laravel5.5仍然处于dev中，这意味着没有稳定的版本，默认情况下，Composer限制您只下载稳定的编号版本，以避免下载任何正在进行中的、可能包含破坏更改的包。

您可以通过在composer.json文件中添加以下两行来规避此问题

"minimum-stability": "dev",
"prefer-stable": true,

通过这种方式，更喜欢任何能够找到它们的稳定版本，但如果没有其他可用的版本，它将允许您下载dev包。

Answer 2

我认为您也应该更新PHP版本。如果您检查正式的文档，它表示最低PHP需求7.0.0。