friendica/src/Core/Cache/AbstractCacheDriver.php

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<?php
namespace Friendica\Core\Cache;
use Friendica\BaseObject;
/**
* Abstract class for common used functions
*
* Class AbstractCacheDriver
*
* @package Friendica\Core\Cache
*/
abstract class AbstractCacheDriver extends BaseObject
{
/**
* @param string $key The original key
* @return string The cache key used for the cache
*/
protected function getCacheKey($key)
{
// We fetch with the hostname as key to avoid problems with other applications
return self::getApp()->get_hostname() . ":" . $key;
}
/**
* @param array $keys A list of cached keys
* @return array A list of original keys
*/
protected function getOriginalKeys($keys)
{
if (empty($keys)) {
return [];
} else {
// Keys are prefixed with the node hostname, let's remove it
array_walk($keys, function (&$value) {
$value = preg_replace('/^' . self::getApp()->get_hostname() . ':/', '', $value);
});
sort($keys);
return $keys;
}
}
/**
* Filters a list for a given prefix
*
* @param array $list the list
* @param string|null $prefix the prefix
*
* @return array the filtered list
*/
protected function filterPrefix($list, $prefix = null)
{
if (empty($prefix)) {
return array_keys($list);
} else {
$result = [];
foreach (array_keys($list) as $key) {
if (strpos($key, $prefix) === 0) {
array_push($result, $key);
}
}
return $result;
}
}
}