doCommonClear example

if (!$ok && !is_writable($this->directory)) {
            throw new CacheException(sprintf('Cache directory is not writable (%s).', $this->directory));
        }

        return $ok;
    }

    protected function doClear(string $namespace): bool
    {
        $this->values = [];

        return $this->doCommonClear($namespace);
    }

    protected function doDelete(array $ids): bool
    {
        foreach ($ids as $id) {
            unset($this->values[$id]);
        }

        return $this->doCommonDelete($ids);
    }

    
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