yii2使用magrate新增权限流程：
1、到项目根目录（必须是项目环境中，如我的是在虚拟机中:[root@localhost crm]# php ./yii migrate/create user_rbac）执行指令：php ./yii migrate/create 文件名;
显示一下说明成功：
Create new migration '/media/psf/crm/console/migrations/m190828_053939_user_rbac.php'? (yes|no) [no]:yes New migration created successfully.
2、执行：php ./yii migrate
[root@localhost crm]# php ./yii migrate Yii Migration Tool (based on Yii v2.0.15.1)
Total 1 new migration to be applied: m190828_053939_user_rbac
Apply the above migration? (yes|no) [no]:yes *** applying m190828_053939_user_rbac *** applied m190828_053939_user_rbac (time: 0.040s)
1 migration was applied.
3、执成功会在表“administrator_auth_item”生成对应的权限数据
