Composer dumpautoload 出现一大堆错误

1. 执行 php artisan tinker 直接报错 解决：
   仔细回去看了下教程发现 .env 中 APP_NAME = "Laravel Shop" 这个要加引号听说里面带空格就要加引号
2. 执行 composer dumpautoload 报错如下：

   vagrant@homestead:~/code/laravel-shop$ composer dump-autoload
   Generating optimized autoload files
   PHP Fatal error:  Uncaught TypeError: Argument 1 passed to Composer\Autoload\ClassLoader::addClassMap() must be of the type array, integer given, called in phar:///usr/local/bin/composer/src/Composer/Autoload/AutoloadGenerator.php on line 760 and defined in phar:///usr/local/bin/composer/vendor/composer/ClassLoader.php:92
   Stack trace:
   #0 phar:///usr/local/bin/composer/src/Composer/Autoload/AutoloadGenerator.php(760): Composer\Autoload\ClassLoader->addClassMap(1)
   #1 phar:///usr/local/bin/composer/src/Composer/Autoload/AutoloadGenerator.php(303): Composer\Autoload\AutoloadGenerator->getStaticFile('a60f33a7b386f50...', '/home/vagrant/c...', '/home/vagrant/c...', '/home/vagrant/c...', 50600)
   #2 phar:///usr/local/bin/composer/src/Composer/Command/DumpAutoloadCommand.php(75): Composer\Autoload\AutoloadGenerator->dump(Object(Composer\Config), Object(Composer\Repository\InstalledFilesystemRepository), Object(Composer\Package\RootPackage), Object(Composer\Installer\InstallationManager), '/home/vagrant/c...', true)
   #3 phar:///usr/local/ in phar:///usr/local/bin/composer/vendor/composer/ClassLoader.php on line 92
   Fatal error: Uncaught TypeError: Argument 1 passed to Composer\Autoload\ClassLoader::addClassMap() must be of the type array, integer given, called in phar:///usr/local/bin/composer/src/Composer/Autoload/AutoloadGenerator.php on line 760 and defined in phar:///usr/local/bin/composer/vendor/composer/ClassLoader.php:92
   Stack trace:
   #0 phar:///usr/local/bin/composer/src/Composer/Autoload/AutoloadGenerator.php(760): Composer\Autoload\ClassLoader->addClassMap(1)
   #1 phar:///usr/local/bin/composer/src/Composer/Autoload/AutoloadGenerator.php(303): Composer\Autoload\AutoloadGenerator->getStaticFile('a60f33a7b386f50...', '/home/vagrant/c...', '/home/vagrant/c...', '/home/vagrant/c...', 50600)
   #2 phar:///usr/local/bin/composer/src/Composer/Command/DumpAutoloadCommand.php(75): Composer\Autoload\AutoloadGenerator->dump(Object(Composer\Config), Object(Composer\Repository\InstalledFilesystemRepository), Object(Composer\Package\RootPackage), Object(Composer\Installer\InstallationManager), '/home/vagrant/c...', true)
   #3 phar:///usr/local/ in phar:///usr/local/bin/composer/vendor/composer/ClassLoader.php on line 92

苦恼半天最后这样解决了 进入项目 根目录：

$  rm -rf vendor/composer/autoload_*  
$  composer dumpautoload