我对 symfony 和显然是 twig 有疑问。 我已经在一个项目上工作了一段时间，当我准备发布一个新版本时(通过 ftp 上传所有内容，然后:https://medium.com/@runawaycoin/deploying-symfony-4-application-to-shared-hosting-with-just-ftp-access-e65d2c5e0e3d)。

就在上传之前，我发现该应用程序在一天前停止工作。我开始搜索问题，但日志中没有任何内容。我决定重新上传所有内容并清除缓存，以防出现问题，但仍然没有任何问题，只有 500 错误。

然后我启用调试，并得到错误:

The autoloader expected class "Twig\Extension\AbstractExtension" to be defined in file ".../symfony/vendor/composer/../twig/twig/src/Extension/AbstractExtension.php". The file was found but the class was not in it, the class name or namespace probably has a typo.

我尝试了所有我能在网上找到的东西，但唯一遇到类似问题的人通过添加 Twig /扩展解决了它，但这也没有解决它。

我完全不明白可能发生了什么，但这个问题似乎是无缘无故出现的，而且没有任何文件更改。

该应用程序之前可以正常工作，并且仍然可以离线工作。

这是 AbstractExtension.php 的代码，与 twigphp/twig repo 上的代码相同:

<?php

namespace Twig\Extension;

class_exists('Twig_Extension');

if (\false) {
    class AbstractExtension extends \Twig_Extension
    {
    }
}

PS : 这个 if false 听起来很奇怪但是和网上的一样所以我不明白

编辑:这是文本日志:

(1/1) RuntimeException
The autoloader expected class "Twig\Extension\AbstractExtension" to be defined in file "/home/homeviewcx/symfony/vendor/composer/../twig/twig/src/Extension/AbstractExtension.php". The file was found but the class was not in it, the class name or namespace probably has a typo.

in DebugClassLoader.php line 288
at DebugClassLoader->checkClass('Twig\\Extension\\AbstractExtension', '/home/homeviewcx/symfony/vendor/composer/../twig/twig/src/Extension/AbstractExtension.php')
in DebugClassLoader.php line 159
at DebugClassLoader->loadClass('Twig\\Extension\\AbstractExtension')
at spl_autoload_call('Twig\\Extension\\AbstractExtension')
in CsrfExtension.php line 21
at require('/home/homeviewcx/symfony/vendor/symfony/twig-bridge/Extension/CsrfExtension.php')
in DebugClassLoader.php line 145
at DebugClassLoader->loadClass('Symfony\\Bridge\\Twig\\Extension\\CsrfExtension')
at spl_autoload_call('Symfony\\Bridge\\Twig\\Extension\\CsrfExtension')
at class_exists('Symfony\\Bridge\\Twig\\Extension\\CsrfExtension')
in FrameworkExtension.php line 1240
at FrameworkExtension->registerSecurityCsrfConfiguration(array('enabled' => true), object(MergeExtensionConfigurationContainerBuilder), object(XmlFileLoader))
in FrameworkExtension.php line 205
at FrameworkExtension->load(array(array('router' => array('resource' => 'kernel::loadRoutes', 'type' => 'service')), array('secret' => 'env_d3d895c31330f4ea_APP_SECRET_dd4bd60cef72a43e4dea38ee2ba60137', 'session' => array('handler_id' => null), 'php_errors' => array('log' => true), 'cache' => null), array('router' => array('strict_requirements' => null)), array('default_locale' => 'en', 'translator' => array('paths' => array('/home/homeviewcx/symfony/translations'), 'fallbacks' => array('en'))), array('validation' => array('email_validation_mode' => 'html5')), array('cache' => array('pools' => array('doctrine.result_cache_pool' => array('adapter' => 'cache.app'), 'doctrine.system_cache_pool' => array('adapter' => 'cache.system'))))), object(MergeExtensionConfigurationContainerBuilder))
in MergeExtensionConfigurationPass.php line 76
at MergeExtensionConfigurationPass->process(object(ContainerBuilder))
in MergeExtensionConfigurationPass.php line 39
at MergeExtensionConfigurationPass->process(object(ContainerBuilder))
in Compiler.php line 95
at Compiler->compile(object(ContainerBuilder))
in ContainerBuilder.php line 746
at ContainerBuilder->compile()
in Kernel.php line 519
at Kernel->initializeContainer()
in Kernel.php line 123
at Kernel->boot()
in Kernel.php line 183
at Kernel->handle(object(Request))
in app.php line 50

这是我的 composer.json :

    {
    "type": "project",
    "license": "proprietary",
    "require": {
        "php": "^7.1.3",
        "ext-iconv": "*",
        "sensio/framework-extra-bundle": "^5.1",
        "symfony/apache-pack": "^1.0",
        "symfony/asset": "^4.1",
        "symfony/config": "^4.1",
        "symfony/console": "^4.1",
        "symfony/dependency-injection": "^4.1",
        "symfony/expression-language": "^4.1",
        "symfony/flex": "^1.0",
        "symfony/form": "^4.1",
        "symfony/framework-bundle": "^4.1",
        "symfony/lts": "^4@dev",
        "symfony/monolog-bundle": "^3.1",
        "symfony/orm-pack": "*",
        "symfony/process": "^4.1",
        "symfony/security-bundle": "^4.1",
        "symfony/serializer-pack": "*",
        "symfony/swiftmailer-bundle": "^3.1",
        "symfony/twig-bundle": "^4.1",
        "symfony/validator": "^4.1",
        "symfony/web-link": "^4.1",
        "symfony/yaml": "^4.1"
    },
    "require-dev": {
        "symfony/debug-pack": "*",
        "symfony/dotenv": "^4.1",
        "symfony/maker-bundle": "^1.0",
        "symfony/profiler-pack": "*",
        "symfony/test-pack": "^1.0",
        "symfony/web-server-bundle": "^4.1"
    },
    "config": {
        "preferred-install": {
            "*": "dist"
        },
        "sort-packages": true
    },
    "autoload": {
        "psr-4": {
            "App\\": "src/"
        }
    },
    "autoload-dev": {
        "psr-4": {
            "App\\Tests\\": "tests/"
        }
    },
    "replace": {
        "symfony/polyfill-iconv": "*",
        "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"
        ],
        "prod": [
          "SET APP_ENV=prod",
          "composer install --no-dev --optimize-autoloader",
          "composer dump-autoload --optimize --no-dev --classmap-authoritative"
        ],
        "dev": [
          "SET APP_ENV=dev",
          "composer install"
        ]
    },
    "conflict": {
        "symfony/symfony": "*"
    },
    "extra": {
        "symfony": {
            "allow-contrib": false
        }
    }
}

PS:我个人没有在任何地方扩展 AbstractExtension 类(也没有任何其他 twig 类)，也没有触及容器编译器(这里仍然相对较新)，但是是的，可能就是这样

最佳答案

在此处查看导致错误的提交:

https://github.com/twigphp/Twig/commit/2c174e4015dcfdcb4f39d004e3b1aeccae77aa25#diff-d2944cb9ff29770359c04590530f931aL5

唯一的变化是加载类的方式，因为 class_exists('Twig_Extension') 将调用 __autoload() 因此类应该是已经在此阶段调用。

看起来您已经更新了依赖项，但是您是否清除了缓存？由于问题在本地不可用(在 dev 上工作正常)，问题仅在您的服务器上(应用程序在 prod 模式下运行)symfony 可能仍在使用旧的解释错误的缓存。

如果是这种情况，您将需要通过运行以下命令来刷新服务器上的缓存:

php bin/console 缓存:clear --no-warmup --env=prod

关于php - Symfony - twig - 自动加载器预期类，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/52345233/