Laravel 5 Cache/Paginate Issue - php

Question

So I decided to go from Laravel 4 to 5 which took me around 1-2 days because I barely knew how to do the transition. While doing the Upgrade for my app i came across a small problem with Json Pagination.
This code is what allows a PageQuery to be Paginated Via KnockoutJS
/**
* Builds paginate query with given parameters.
*
* #param array $params
* #param integer $page
* #param integer $perPage
*
* #return array
*/
public function buildPaginateQuery(array $params, $page = 1, $perPage = 15)
{
$query = $this->model;
$query = $this->appendParams($params, $query);
$count = (new Cache)->remember('count', '2000', function() use ($query){
return $query->count();
});
$totalPages = $count / $perPage;
$query = $query->skip($perPage * ($page - 1))->take($perPage);
$query = $query->order(isset($params['order']) && $params['order'] ? $params['order'] : null);
//$query = $query->cacheTags(array($this->model->table, 'pagination'))->remember(2000);
$query = (new Cache)->remember(array($this->model->table, 'pagination'), '2000', function() use ($query){
return $query;
});
return array('query' => $query, 'totalPages' => $totalPages, 'totalItems' => $count);
}
which eventually lead to this error in this screenshot
The Error directs to the code above and this code specifically
/**
* Get the full path for the given cache key.
*
* #param string $key
* #return string
*/
protected function path($key)
{
$parts = array_slice(str_split($hash = md5($key), 2), 0, 2);
$path = $this->directory() . '/'.join('/', $parts).'/'.$hash;
//unset the tags so we use the base cache folder if no
//tags are passed with subsequent call to the same instance
//of this class
//$this->tags = array();
return $path;
}
Im using a custom Cache Driver called TaggedFile. This worked fine in L4 but came across errors because There were some files removed within the Cache Alias. Like the StoreInterface. Can I receive some help for this? If you need me to post anything I will.
More Stuff:
Before I used this to Register the taggedFile Driver in global.php:
Cache::extend('taggedFile', function($app)
{
return new Illuminate\Cache\Repository(new Lib\Extensions\TaggedFileCache);
});
I do not know where exactly to put this. Does anyone know the equivalent of that? I tried putting it in AppServiceProvider but an error came up saying:
Call to undefined method Illuminate\Support\Facades\Cache::extend()
This used to work in L4 so i decided to go into the vendor folder manually find what the problem was....
This only had: getFacadeAccessor (Which L4 also only had but extend worked)
So i decided to use getFacadeAccessor and it worked, but i don't know if that was the solution or not.

Answer 1

As you noticed you are passing an array as a $key value, the safest way would be to replace the code
$parts = array_slice(str_split($hash = md5($key), 2), 0, 2);
With
$parts = array_slice(str_split($hash = md5(json_encode($key)), 2), 0, 2);
NB: I am not sure what version of php you are running, but json_encode( ... ) is normally faster then serialize( ... )