Cache::many with MemcachedStore throws exception because of array_combine

[WarcraftLogs]

• Laravel Version: 8.15.0
• PHP Version: 7.4.11

Description:

When invoking Cache::many() with an array of keys where only a subset of the keys are hits, an exception is occurring because of an element count mismatch using array_combine.

ErrorException: array_combine(): Both parameters should have an equal number of elements
#75 /vendor/laravel/framework/src/Illuminate/Cache/MemcachedStore.php(92): Illuminate\Foundation\Bootstrap\HandleExceptions::handleError
#74 internal: array_combine
#73 /vendor/laravel/framework/src/Illuminate/Cache/MemcachedStore.php(92): Illuminate\Cache\MemcachedStore::many
#72 /vendor/laravel/framework/src/Illuminate/Cache/Repository.php(125): Illuminate\Cache\Repository::many
#71 /vendor/laravel/framework/src/Illuminate/Cache/CacheManager.php(396): Illuminate\Cache\CacheManager::__call
#70 /vendor/laravel/framework/src/Illuminate/Support/Facades/Facade.php(261): Illuminate\Support\Facades\Facade::__callStatic

Steps To Reproduce:

Use the Memcached store and invoke Cache::many with a set of keys where some are in the cache and some are not.

[taylorotwell]

Unable to recreate this:

[WarcraftLogs]

I'll dig into it and try to get a better example, since it must be more specific than I thought. It's a real-world exception that I'm hitting though so I know it's there. 👍