当 composer update 和 composer install 出错时怎么办？

Question

我运行composer install 我得到这个错误，告诉我使用composer update

Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Warning: The lock file is not up to date with the latest changes in composer.json. You may be getting outdated dependencies. Run update to update them.
Your requirements could not be resolved to an installable set of packages.

  Problem 1
    - Installation request for doctrine/inflector v1.3.0 -> satisfiable by doctrine/inflector[v1.3.0].
    - doctrine/inflector v1.3.0 requires php ^7.1 -> your PHP version (7.0.25) does not satisfy that requirement.
  Problem 2
    - Installation request for symfony/css-selector v4.0.3 -> satisfiable by symfony/css-selector[v4.0.3].
    - symfony/css-selector v4.0.3 requires php ^7.1.3 -> your PHP version (7.0.25) does not satisfy that requirement.
  Problem 3
    - Installation request for symfony/event-dispatcher v4.0.3 -> satisfiable by symfony/event-dispatcher[v4.0.3].
    - symfony/event-dispatcher v4.0.3 requires php ^7.1.3 -> your PHP version (7.0.25) does not satisfy that requirement.
  Problem 4
    - Installation request for doctrine/instantiator 1.1.0 -> satisfiable by doctrine/instantiator[1.1.0].
    - doctrine/instantiator 1.1.0 requires php ^7.1 -> your PHP version (7.0.25) does not satisfy that requirement.
  Problem 5
    - doctrine/inflector v1.3.0 requires php ^7.1 -> your PHP version (7.0.25) does not satisfy that requirement.
    - laravel/framework v5.5.32 requires doctrine/inflector ~1.1 -> satisfiable by doctrine/inflector[v1.3.0].
    - Installation request for laravel/framework v5.5.32 -> satisfiable by laravel/framework[v5.5.32].

我运行composer update，我得到了这个

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
    - doctrine/dbal v2.6.3 requires php ^7.1 -> your PHP version (7.0.25) does not satisfy that requirement.
    - doctrine/dbal v2.6.2 requires php ^7.1 -> your PHP version (7.0.25) does not satisfy that requirement.
    - doctrine/dbal v2.6.1 requires php ^7.1 -> your PHP version (7.0.25) does not satisfy that requirement.
    - doctrine/dbal v2.6.0 requires php ^7.1 -> your PHP version (7.0.25) does not satisfy that requirement.
    - Installation request for doctrine/dbal ^2.6 -> satisfiable by doctrine/dbal[v2.6.0, v2.6.1, v2.6.2, v2.6.3].

现在我该怎么办？

这就是我在composer.json中所拥有的

猫作曲家.json

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": ">=7.0.0",
        "anouar/paypalpayment": ">=3.0",
        "doctrine/dbal": "^2.6",
        "fideloper/proxy": "~3.3",
        "guzzlehttp/guzzle": "^6.3",
        "intervention/image": "^2.4",
        "laravel/framework": "5.5.*",
        "laravel/tinker": "~1.0",
        "spatie/laravel-newsletter": "^4.1",
        "srmklive/paypal": "~1.0"
    },
    "require-dev": {
        "filp/whoops": "~2.0",
        "fzaninotto/faker": "~1.4",
        "mockery/mockery": "~1.0",
        "phpunit/phpunit": "~6.0"
    },
    "autoload": {
        "classmap": [
            "database/seeds",
            "database/factories"
        ],
        "psr-4": {
            "App\\": "app/"
        },
        "files": ["app/Http/Helper.php"]
    },
    "autoload-dev": {
        "psr-4": {
            "Tests\\": "tests/"
        }
    },
    "extra": {
        "laravel": {
            "dont-discover": [
            ]
        }
    },
    "scripts": {
        "post-root-package-install": [
            "@php -r \"file_exists('.env') || copy('.env.example', '.env');\""
        ],
        "post-create-project-cmd": [
            "@php artisan key:generate"
        ],
        "post-autoload-dump": [
            "Illuminate\\Foundation\\ComposerScripts::postAutoloadDump",
            "@php artisan package:discover"
        ]
    },
    "config": {
        "preferred-install": "dist",
        "sort-packages": true,
        "optimize-autoloader": true
    }
} 

Answer 1

几天前我遇到了同样的问题，我通过在我的 composer.json 文件中伪造 php 版本来修复它[不推荐]。

"config": {
        "preferred-install": "dist",
        "sort-packages": true,
        "optimize-autoloader": true,
        "platform" : {
            "php": "7.1"
        }
    }

更多详情请阅读this

或者您可以使用 --ignore-platform-reqs 标志执行 composer update/install 命令，如下所示

composer 更新 --ignore-platform-reqs