Composer php 无法将Drupal composer要求解析为一组可安装的软件包

我无法从composer更新Drupal

运行composer update会给med带来此错误，我需要帮助来解释：

使用包信息加载composer存储库 更新依赖项（包括需要开发人员） 无法将您的需求解析为可安装的软件包集

问题1

- don't install drupal/core 8.6.3|remove drupal/drupal dev-master

- don't install drupal/core 8.6.x-dev|remove drupal/drupal dev-master

- don't install drupal/core 8.7.x-dev|remove drupal/drupal dev-master

- Installation request for drupal/drupal dev-master -> satisfiable by drupal/drupal[dev-master].

- Installation request for drupal/core ^8.6.3 -> satisfiable by drupal/core[8.6.3, 8.6.x-dev, 8.7.x-dev].

我的composer.json文件如下所示：

{
    "name": "drupal/drupal",
    "description": "Drupal is an open source content management platform powering millions of websites and applications.",
    "type": "project",
    "license": "GPL-2.0-or-later",
    "require": {
        "composer/installers": "^1.2",
        "wikimedia/composer-merge-plugin": "^1.4",
        "algolia/algoliasearch-client-php": "^1.14",
        "drupal/raven": "^2.4",
        "drupal/core": "^8.6.3"
    },
    "require-dev": {
        "webflo/drupal-core-require-dev": "^8.6.0"
    },
    "conflict": {
        "drupal/drupal": "*"
    },
    "minimum-stability": "dev",
    "prefer-stable": true,
    "config": {
        "preferred-install": "dist",
        "autoloader-suffix": "Drupal8"
    },

    "extra": {
        "_readme": [
            "By default Drupal loads the autoloader from ./vendor/autoload.php.",
            "To change the autoloader you can edit ./autoload.php.",
            "This file specifies the packages.drupal.org repository.",
            "You can read more about this composer repository at:",
            "https://www.drupal.org/node/2718229"
        ],
        "merge-plugin": {
            "include": [
                "core/composer.json"
            ],
            "recurse": true,
            "replace": false,
            "merge-extra": false
        },
        "installer-paths": {
            "core": ["type:drupal-core"],
            "modules/contrib/{$name}": ["type:drupal-module"],
            "profiles/contrib/{$name}": ["type:drupal-profile"],
            "themes/contrib/{$name}": ["type:drupal-theme"],
            "drush/contrib/{$name}": ["type:drupal-drush"],
            "modules/custom/{$name}": ["type:drupal-custom-module"],
            "themes/custom/{$name}": ["type:drupal-custom-theme"]
        }
    },
    "autoload": {
        "psr-4": {
            "Drupal\\Core\\Composer\\": "core/lib/Drupal/Core/Composer"
        }
    },
    "scripts": {
        "pre-autoload-dump": "Drupal\\Core\\Composer\\Composer::preAutoloadDump",
        "post-autoload-dump": "Drupal\\Core\\Composer\\Composer::ensureHtaccess",
        "post-package-install": "Drupal\\Core\\Composer\\Composer::vendorTestCodeCleanup",
        "post-package-update": "Drupal\\Core\\Composer\\Composer::vendorTestCodeCleanup",
        "drupal-phpunit-upgrade-check": "Drupal\\Core\\Composer\\Composer::upgradePHPUnit",
        "drupal-phpunit-upgrade": "@composer update phpunit/phpunit --with-dependencies --no-progress",
        "phpcs": "phpcs --standard=core/phpcs.xml.dist --runtime-set installed_paths $($COMPOSER_BINARY config vendor-dir)/drupal/coder/coder_sniffer --",
        "phpcbf": "phpcbf --standard=core/phpcs.xml.dist --runtime-set installed_paths $($COMPOSER_BINARY config vendor-dir)/drupal/coder/coder_sniffer --"
    },
    "repositories": [
        {
            "type": "composer",
            "url": "https://packages.drupal.org/8"
        }
    ]
}

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这是与PHP&composer版本的兼容性问题。我用composer 1.7.2更改了PHP7.1版本以执行它

如果您安装的composer版本高于1.7.2，请使用以下命令降级：

composer self-update 1.7.2

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这个问题仍然存在吗？我无法重现该问题，因为自从您发布问题后，包已经更新。这也可能有帮助。