无法安装barryvdh/laravel-dompdf

Question

我无法使用barryvdh/laravel-dompdf安装composer require barryvdh/laravel-dompdf。

我得到的错误是：

无效的参数异常无法找到barryvdh/laravel的匹配版本。检查包的拼写、版本约束，以及包的稳定性是否与最小稳定性(dev)相匹配。

因此，为了修复错误，我在composer.json中包括了composer.json，并做了一个composer update。这一次它给了我一个错误：

所要求的包barryvdh/laravel在任何版本中都找不到。包名中可能有错误。

下面是我的composer.json：

{
    "name": "laravel/laravel",
    "description": "The Laravel Framework.",
    "keywords": ["framework", "laravel"],
    "license": "MIT",
    "type": "project",
    "require": {
        "php": "^7.1.3",
        "fideloper/proxy": "^4.0",
        "guzzlehttp/guzzle": "^6.3",
        "laravel/framework": "5.7.*",
        "laravel/tinker": "^1.0",
        "barryvdh/laravel-dompdf": "master@dev"
    },
    "repositories":
    [
        {
          "type": "composer",
          "url": "https:\/\/www.phpclasses.org\/"
        },
        {
          "packagist": false
        }
    ],
    "require-dev": {
        "beyondcode/laravel-dump-server": "^1.0",
        "filp/whoops": "^2.0",
        "fzaninotto/faker": "^1.4",
        "mockery/mockery": "^1.0",
        "nunomaduro/collision": "^2.0",
        "phpunit/phpunit": "^7.0"
    },
    "autoload": {
        "classmap": [
            "database/seeds",
            "app/includes",
            "database/factories"
        ],
        "psr-4": {
            "App\\": "app/"
        }
    },
    "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
    },
    "minimum-stability": "dev",
    "prefer-stable": true
}

你觉得我在这里错过了什么？

Answer 1

通常，在安装第三方软件包时，最好不要直接编辑composer.json .您可以从文件中删除行"barryvdh/laravel-dompdf": "master@dev"，然后从项目根目录运行以下命令：

composer require barryvdh/laravel-dompdf

它安装最新稳定的第三方包，并自动更新composer.json和composer.lock文件。

更新:要解决composer.json文件的问题，请将存储库键更改为：

"repositories" : 
[
    {
        "type": "composer",
        "url": "https://packagist.org"
    },
    {
        "packagist": false
    }
]

Answer 2

使用

"barryvdh/laravel-dompdf": "^0.8.4",

而不是

"barryvdh/laravel-dompdf": "master@dev"

Answer 3

删除composer.json文件中的这一行

"require": {
    "barryvdh/laravel-dompdf": "master@dev"
}, 

之后，在命令提示符中运行此命令。

composer require barryvdh/laravel-dompdf

这将下载包和dompdf + fontlib库。这将为您的项目生成最新版本。

请检查这个：barryvdh/laravel-dompdf