Core.php

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<?php
namespace Magento\Framework\Cache;

class Core extends \Zend_Cache_Core
{
    protected $_specificOptions = ['backend_decorators' => [], 'disable_save' => false];

    protected function _id($cacheId)
    {
        if ($cacheId !== null) {
            $cacheId = str_replace('.', '__', $cacheId); //reduce collision chances
            $cacheId = preg_replace('/([^a-zA-Z0-9_]{1,1})/', '_', $cacheId);
            if (isset($this->_options['cache_id_prefix'])) {
                $cacheId = $this->_options['cache_id_prefix'] . $cacheId;
            }
        }
        return $cacheId;
    }

    protected function _tags($tags)
    {
        foreach ($tags as $key => $tag) {
            $tags[$key] = $this->_id($tag);
        }
        return $tags;
    }

    public function save($data, $cacheId = null, $tags = [], $specificLifetime = false, $priority = 8)
    {
        if ($this->getOption('disable_save')) {
            return true;
        }
        $tags = $this->_tags($tags);
        return parent::save($data, $cacheId, $tags, $specificLifetime, $priority);
    }

    public function clean($mode = 'all', $tags = [])
    {
        $tags = $this->_tags($tags);
        return parent::clean($mode, $tags);
    }

    public function getIdsMatchingTags($tags = [])
    {
        $tags = $this->_tags($tags);
        return parent::getIdsMatchingTags($tags);
    }

    public function getIdsNotMatchingTags($tags = [])
    {
        $tags = $this->_tags($tags);
        return parent::getIdsNotMatchingTags($tags);
    }

    public function setBackend(\Zend_Cache_Backend $backendObject)
    {
        $backendObject = $this->_decorateBackend($backendObject);
        parent::setBackend($backendObject);
    }

    protected function _decorateBackend(\Zend_Cache_Backend $backendObject)
    {
        if (!is_array($this->_specificOptions['backend_decorators'])) {
            \Zend_Cache::throwException("'backend_decorator' option should be an array");
        }

        foreach ($this->_specificOptions['backend_decorators'] as $decoratorName => $decoratorOptions) {
            if (!is_array($decoratorOptions) || !array_key_exists('class', $decoratorOptions)) {
                \Zend_Cache::throwException(
                    "Concrete decorator options in '" . $decoratorName . "' should be an array containing 'class' key"
                );
            }
            $classOptions = array_key_exists('options', $decoratorOptions) ? $decoratorOptions['options'] : [];
            $classOptions['concrete_backend'] = $backendObject;

            if (!class_exists($decoratorOptions['class'])) {
                \Zend_Cache::throwException(
                    "Class '" . $decoratorOptions['class'] . "' specified in '" . $decoratorName . "' does not exist"
                );
            }

            $backendObject = new $decoratorOptions['class']($classOptions);
            if (!$backendObject instanceof \Magento\Framework\Cache\Backend\Decorator\AbstractDecorator) {
                \Zend_Cache::throwException(
                    "Decorator in '" .
                    $decoratorName .
                    "' should extend \Magento\Framework\Cache\Backend\Decorator\AbstractDecorator"
                );
            }
        }

        return $backendObject;
    }
}