在PHP中使用的语句别名优先于import。因此，ClassesTableSeeder类不在一个定义的命名空间，你并不需要导入DB类。因此，您可以移除 use DB 。
来自 http://stackoverflow.com/questions/31088292/laravel-php-artisan-dbseed-leads-to-use-statement-error
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php artisan The use statement with non-compound name 'DB' has no effect
星期四, 2016-06-02 10:25 — adminshiping1
In PHP the use statement is more of an alias than import. So since the ClassesTableSeeder class isn't in a defined namespace, you don't need to import the DB class. As a result you can remove use DB entirely.
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