Below is the code after the change, the version to PHP 8.1 in host other laravel websites are worked after `composer update.
PHP 8.1.1 (cli) (built: Dec 15 2021 04:17:42) (NTS) Copyright (c) The PHP Group Zend Engine v4.1.1, Copyright (c) Zend Technologies
this is the error log :
@php artisan package:discover --ansi
Deprecated: Return type of Illuminate\Container\Container::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/xyz/example.com/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 1270
Deprecated: Return type of Illuminate\Container\Container::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/xyz/example.com/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 1281
Deprecated: Return type of Illuminate\Container\Container::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/xyz/example.com/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 1293
Deprecated: Return type of Illuminate\Container\Container::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/xyz/example.com/vendor/laravel/framework/src/Illuminate/Container/Container.php on line 1306
Deprecated: Return type of Illuminate\Config\Repository::offsetExists($key) should either be compatible with ArrayAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/xyz/example.com/vendor/laravel/framework/src/Illuminate/Config/Repository.php on line 141
Deprecated: Return type of Illuminate\Config\Repository::offsetGet($key) should either be compatible with ArrayAccess::offsetGet(mixed $offset): mixed, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/xyz/example.com/vendor/laravel/framework/src/Illuminate/Config/Repository.php on line 152
Deprecated: Return type of Illuminate\Config\Repository::offsetSet($key, $value) should either be compatible with ArrayAccess::offsetSet(mixed $offset, mixed $value):void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/xyz/example.com/vendor/laravel/framework/src/Illuminate/Config/Repository.php on line 164
Deprecated: Return type of Illuminate\Config\Repository::offsetUnset($key) should either be compatible with ArrayAccess::offsetUnset(mixed $offset): void, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in /home/xyz/example.com/vendor/laravel/framework/src/Illuminate/Config/Repository.php on line 175
In Collection.php line 11:
During inheritance of ArrayAccess: Uncaught ErrorException: Return type of Illuminate\Support\Collection::offsetExists($key) should either be compatible with Arra
yAccess::offsetExists(mixed $offset): bool, or the #[\ReturnTypeWillChange] attribute should be used to temporarily suppress the notice in
Please give me a solution to solve this problem.
I resolve the problem with the upgrade laravel from 7 to 8