您不能使用 "markdown_to_html" 过滤器，因为没有可用的 Markdown 库

Question

我正在使用带有 PHP 7.4.24 和 Composer 2.1.8 的 Symfony 5.3.9。我想使用 markdown_to_html 呈现以下模板，但出现错误。

这是blog.html.twig

...
<article class="text-center">
    {{ content | markdown_to_html }}
</article>
...

这是我得到的错误：

An exception has been thrown during the rendering of a template ("You cannot use the "markdown_to_html" filter as no Markdown library is available; try running "composer require league/html-to-markdown".").

我运行 composer require league/html-to-markdown 但它显示“没有要安装、更新或删除的内容”。

我的composer.json:

{
    "type": "project",
    "license": "proprietary",
    "require": {
        "php": "^7.4.24",
        "ext-ctype": "*",
        "ext-iconv": "*",
        "composer/package-versions-deprecated": "^1.10",
        "doctrine/annotations": "^1.0",
        "doctrine/doctrine-bundle": "^2.1",
        "doctrine/doctrine-migrations-bundle": "^3.0",
        "doctrine/orm": "^2.7",
        "league/html-to-markdown": "^5.0",
        "phpdocumentor/reflection-docblock": "^5.2",
        "sensio/framework-extra-bundle": "^5.5",
        "symfony/apache-pack": "^1.0",
        "symfony/asset": "5.3.*",
        "symfony/console": "5.3.*",
        "symfony/dotenv": "5.3.*",
        "symfony/expression-language": "5.3.*",
        "symfony/flex": "^1.3.1",
        "symfony/form": "5.3.*",
        "symfony/framework-bundle": "5.3.*",
        "symfony/http-client": "5.3.*",
        "symfony/intl": "5.3.*",
        "symfony/mailer": "5.3.*",
        "symfony/mime": "5.3.*",
        "symfony/monolog-bundle": "^3.1",
        "symfony/notifier": "5.3.*",
        "symfony/process": "5.3.*",
        "symfony/property-access": "5.3.*",
        "symfony/property-info": "5.3.*",
        "symfony/runtime": "5.3.*",
        "symfony/security-bundle": "5.3.*",
        "symfony/serializer": "5.3.*",
        "symfony/string": "5.3.*",
        "symfony/translation": "5.3.*",
        "symfony/twig-bundle": "5.3.*",
        "symfony/validator": "5.3.*",
        "symfony/web-link": "5.3.*",
        "symfony/yaml": "5.3.*",
        "twig/cssinliner-extra": "^3.3",
        "twig/extra-bundle": "^3.3",
        "twig/inky-extra": "^3.3",
        "twig/markdown-extra": "^3.3",
        "twig/twig": "^2.12|^3.0"
    },
    "require-dev": {
        "symfony/browser-kit": "^5.3",
        "symfony/css-selector": "^5.3",
        "symfony/debug-bundle": "^5.3",
        "symfony/maker-bundle": "^1.20",
        "symfony/phpunit-bridge": "^5.3",
        "symfony/stopwatch": "^5.3",
        "symfony/var-dumper": "^5.3",
        "symfony/web-profiler-bundle": "^5.3"
    },
    "config": {
        "optimize-autoloader": true,
        "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-php72": "*",
        "symfony/polyfill-php71": "*",
        "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": "5.3.*"
        }
    }
}

我已遵循此文档 https://twig.symfony.com/doc/3.x/filters/markdown_to_html.html。我做错了什么？

Answer 1

解决办法是执行：

composer require league/commonmark

twig/markdown-extra 包只是提供了一个用于调用 markdown 处理器的 twig 扩展。您仍然需要安装一个实际的降价包。这在 markdown_to_html 页面的最后有记录，但不是很清楚。

如果未找到降价包，则发出 html_to_markdown 建议。如果这是需要的，那会很好，但 markdown_to_html 是一个更常见的要求。因此所有的评论。该建议将在下一个版本中修复。

仅供参考，联盟包并不是唯一受支持的包。您还可以使用：

   "require-dev": {
        "erusev/parsedown": "^1.7",
        "league/commonmark": "^1.0",
        "league/html-to-markdown": "^4.8|^5.0",
        "michelf/php-markdown": "^1.8"

如markdown-extra/composer中所列。json

您不能使用 "markdown_to_html" 过滤器，因为没有可用的 Markdown 库

You cannot use the "markdown_to_html" filter as no Markdown library is available

php

markdown

symfony

composer-php