Lumen event 与 PHP7 扩展 event 冲突如何解决？

lumen5.3.3 event 与php7扩展event 冲突如何解决？
系统报错日志
lumen.ERROR: ErrorException: Cannot declare class Event, because the name is already in use in /www/api/vendor/laravel/lumen-framework/src/Application.php:667 Stack trace: #0 [internal function]: Laravel\Lumen\Application->Laravel\Lumen\Concerns{closure}(2, 'Cannot declare ...', '/www/api...', 667, Array) #1 /www/api/vendor/laravel/lumen-framework/src/Application.php(667): class_alias('Illuminate\Supp...', 'Event') #2 /www/api/vendor/laravel/lumen-framework/src/Application.php(636): Laravel\Lumen\Application->withAliases(Array) #3 /www/api/bootstrap/app.php(39): Laravel\Lumen\Application->withFacades() #4 /www/web/api-v2/public/index.php(13): require('/www/api...') #5 {main} [] []