[Symfony\Component\Debug\Exception\FatalThrowableError]
Class 'Doctrine\DBAL\Driver\PDOMySql\Driver' not found

在你的composer.json 文件添加doctrine/dbal如下

"require": {
 "php": ">=7.0.0",
 "fideloper/proxy": "~3.3",
 "laravel/framework": "5.5.*",
 "laravel/tinker": "~1.0",
 "doctrine/dbal": "~2.3"
 },

然后composer update

参考链接

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