在 ErrorHandler.php 中找不到类“Psr\Log\LogLevel”

Question

使用composer update 或composer install 得到这个错误：

Loading composer repositories with package information
Installing dependencies (including require-dev) from lock file
Nothing to install or update
Generating autoload files
> Incenteev\ParameterHandler\ScriptHandler::buildParameters
Updating the "app/config/parameters.yml" file
> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::buildBootstrap
> Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache
PHP Fatal error:  Class 'Psr\Log\LogLevel' not found in /var/www/html/Project/MRA/vendor/symfony/symfony/src/Symfony/Component/Debug/ErrorHandler.php on line 121
Script Sensio\Bundle\DistributionBundle\Composer\ScriptHandler::clearCache handling the post-install-cmd event terminated with an exception



  [RuntimeException]                                                                                                                                             
  An error occurred when executing the "'cache:clear --no-warmup'" command:                                                                                      
  PHP Fatal error:  Class 'Psr\Log\LogLevel' not found in /var/www/html/Project/MRA/vendor/symfony/symfony/src/Symfony/Component/Debug/ErrorHandler.php on line  
   121                                                                                                                                                           
  .                                                                                                                                                              



install [--prefer-source] [--prefer-dist] [--dry-run] [--dev] [--no-dev] [--no-plugins] [--no-custom-installers] [--no-autoloader] [--no-scripts] [--no-progress] [-v|vv|vvv|--verbose] [-o|--optimize-autoloader] [-a|--classmap-authoritative] [--ignore-platform-reqs] [--] [<packages>]...

我使用的是 symfony 2.7.7，这是我的 composer.json：

• "php": ">=5.3.9",
• "symfony/symfony": "2.7.*",
• “教义/orm”：“^2.4.8”，
• "doctrine/doctrine-bundle": "~1.4",
• "symfony/assetic-bundle": "~2.3",
• "symfony/swiftmailer-bundle": "~2.3",
• "symfony/monolog-bundle": "~2.4",
• “sensio/distribution-bundle”：“~4.0”，
• “sensio/framework-extra-bundle”：“^3.0.2”，
• “incenteev/composer-parameter-handler”：“~2.0”，
• “friendsofsymfony/user-bundle”：“~1.3”，
• “mopa/bootstrap-bundle”：“dev-master”，
• "twbs/bootstrap": "^3.3",
• “knplabs/knp-paginator-bundle”：“dev-master”，
• “knplabs/knp-menu-bundle”：“2.0.*@dev”，
• "knplabs/knp-menu": "2.0.*@dev",
• “craue/formflow-bundle”：“~2.0”，
• “friendsofsymfony/rest-bundle”：“^1.7”，
• "sonata-project/admin-bundle": "2.3.*",
• "sonata-project/doctrine-orm-admin-bundle": "2.3.*",
• "sonata-project/user-bundle": "dev-master",
• "sonata-project/datagrid-bundle": "dev-master",
• "siphoc/pdf-bundle": "1.2.*",
• “knplabs/knp-snappy-bundle”：“^1.3”，
• “奏鸣曲项目/easy-extends-bundle”：“^2.1”

Answer 1

好的，PSR Logger 不在 composer.json 中，所以我添加了 "psr/log": "dev-master" 转换为 composer.json 并修复了错误。 PS：不知道为什么突然没安装就不行了！