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/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Cache
 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Core.php 24594 2012-01-05 21:27:01Z matthew $
 */


/**
 * @package    Zend_Cache
 * @copyright  Copyright (c) 2005-2012 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Cache_Core
{
    /**
     * Messages
     */
    const BACKEND_NOT_SUPPORTS_TAG = &#039;tags are not supported by the current backend&#039;;
    const BACKEND_NOT_IMPLEMENTS_EXTENDED_IF = &#039;Current backend doesn\&#039;t implement the Zend_Cache_Backend_ExtendedInterface, so this method is not available&#039;;

    /**
     * Backend Object
     *
     * @var Zend_Cache_Backend_Interface $_backend
     */
    protected $_backend = null;

    /**
     * Available options
     *
     * ====&gt; (boolean) write_control :
     * - Enable / disable write control (the cache is read just after writing to detect corrupt entries)
     * - Enable write control will lightly slow the cache writing but not the cache reading
     * Write control can detect some corrupt cache files but maybe it&#039;s not a perfect control
     *
     * ====&gt; (boolean) caching :
     * - Enable / disable caching
     * (can be very useful for the debug of cached scripts)
     *
     * =====&gt; (string) cache_id_prefix :
     * - prefix for cache ids (namespace)
     *
     * ====&gt; (boolean) automatic_serialization :
     * - Enable / disable automatic serialization
     * - It can be used to save directly datas which aren&#039;t strings (but it&#039;s slower)
     *
     * ====&gt; (int) automatic_cleaning_factor :
     * - Disable / Tune the automatic cleaning process
     * - The automatic cleaning process destroy too old (for the given life time)
     *   cache files when a new cache file is written :
     *     0               =&gt; no automatic cache cleaning
     *     1               =&gt; systematic cache cleaning
     *     x (integer) &gt; 1 =&gt; automatic cleaning randomly 1 times on x cache write
     *
     * ====&gt; (int) lifetime :
     * - Cache lifetime (in seconds)
     * - If null, the cache is valid forever.
     *
     * ====&gt; (boolean) logging :
     * - If set to true, logging is activated (but the system is slower)
     *
     * ====&gt; (boolean) ignore_user_abort
     * - If set to true, the core will set the ignore_user_abort PHP flag inside the
     *   save() method to avoid cache corruptions in some cases (default false)
     *
     * @var array $_options available options
     */
    protected $_options = array(
        &#039;write_control&#039;             =&gt; true,
        &#039;caching&#039;                   =&gt; true,
        &#039;cache_id_prefix&#039;           =&gt; null,
        &#039;automatic_serialization&#039;   =&gt; false,
        &#039;automatic_cleaning_factor&#039; =&gt; 10,
        &#039;lifetime&#039;                  =&gt; 3600,
        &#039;logging&#039;                   =&gt; false,
        &#039;logger&#039;                    =&gt; null,
        &#039;ignore_user_abort&#039;         =&gt; false
    );

    /**
     * Array of options which have to be transfered to backend
     *
     * @var array $_directivesList
     */
    protected static $_directivesList = array(&#039;lifetime&#039;, &#039;logging&#039;, &#039;logger&#039;);

    /**
     * Not used for the core, just a sort a hint to get a common setOption() method (for the core and for frontends)
     *
     * @var array $_specificOptions
     */
    protected $_specificOptions = array();

    /**
     * Last used cache id
     *
     * @var string $_lastId
     */
    private $_lastId = null;

    /**
     * True if the backend implements Zend_Cache_Backend_ExtendedInterface
     *
     * @var boolean $_extendedBackend
     */
    protected $_extendedBackend = false;

    /**
     * Array of capabilities of the backend (only if it implements Zend_Cache_Backend_ExtendedInterface)
     *
     * @var array
     */
    protected $_backendCapabilities = array();

    /**
     * Constructor
     *
     * @param  array|Zend_Config $options Associative array of options or Zend_Config instance
     * @throws Zend_Cache_Exception
     * @return void
     */
    public function __construct($options = array())
    {
        if ($options instanceof Zend_Config) {
            $options = $options-&gt;toArray();
        }
        if (!is_array($options)) {
            Zend_Cache::throwException(&quot;Options passed were not an array&quot;
            . &quot; or Zend_Config instance.&quot;);
        }
        while (list($name, $value) = each($options)) {
            $this-&gt;setOption($name, $value);
        }
        $this-&gt;_loggerSanity();
    }

    /**
     * Set options using an instance of type Zend_Config
     *
     * @param Zend_Config $config
     * @return Zend_Cache_Core
     */
    public function setConfig(Zend_Config $config)
    {
        $options = $config-&gt;toArray();
        while (list($name, $value) = each($options)) {
            $this-&gt;setOption($name, $value);
        }
        return $this;
    }

    /**
     * Set the backend
     *
     * @param  Zend_Cache_Backend $backendObject
     * @throws Zend_Cache_Exception
     * @return void
     */
    public function setBackend(Zend_Cache_Backend $backendObject)
    {
        $this-&gt;_backend= $backendObject;
        // some options (listed in $_directivesList) have to be given
        // to the backend too (even if they are not &quot;backend specific&quot;)
        $directives = array();
        foreach (Zend_Cache_Core::$_directivesList as $directive) {
            $directives[$directive] = $this-&gt;_options[$directive];
        }
        $this-&gt;_backend-&gt;setDirectives($directives);
        if (in_array(&#039;Zend_Cache_Backend_ExtendedInterface&#039;, class_implements($this-&gt;_backend))) {
            $this-&gt;_extendedBackend = true;
            $this-&gt;_backendCapabilities = $this-&gt;_backend-&gt;getCapabilities();
        }

    }

    /**
     * Returns the backend
     *
     * @return Zend_Cache_Backend backend object
     */
    public function getBackend()
    {
        return $this-&gt;_backend;
    }

    /**
     * Public frontend to set an option
     *
     * There is an additional validation (relatively to the protected _setOption method)
     *
     * @param  string $name  Name of the option
     * @param  mixed  $value Value of the option
     * @throws Zend_Cache_Exception
     * @return void
     */
    public function setOption($name, $value)
    {
        if (!is_string($name)) {
            Zend_Cache::throwException(&quot;Incorrect option name : $name&quot;);
        }
        $name = strtolower($name);
        if (array_key_exists($name, $this-&gt;_options)) {
            // This is a Core option
            $this-&gt;_setOption($name, $value);
            return;
        }
        if (array_key_exists($name, $this-&gt;_specificOptions)) {
            // This a specic option of this frontend
            $this-&gt;_specificOptions[$name] = $value;
            return;
        }
    }

    /**
     * Public frontend to get an option value
     *
     * @param  string $name  Name of the option
     * @throws Zend_Cache_Exception
     * @return mixed option value
     */
    public function getOption($name)
    {
        if (is_string($name)) {
            $name = strtolower($name);
            if (array_key_exists($name, $this-&gt;_options)) {
                // This is a Core option
                return $this-&gt;_options[$name];
            }
            if (array_key_exists($name, $this-&gt;_specificOptions)) {
                // This a specic option of this frontend
                return $this-&gt;_specificOptions[$name];
            }
        }
        Zend_Cache::throwException(&quot;Incorrect option name : $name&quot;);
    }

    /**
     * Set an option
     *
     * @param  string $name  Name of the option
     * @param  mixed  $value Value of the option
     * @throws Zend_Cache_Exception
     * @return void
     */
    private function _setOption($name, $value)
    {
        if (!is_string($name) || !array_key_exists($name, $this-&gt;_options)) {
            Zend_Cache::throwException(&quot;Incorrect option name : $name&quot;);
        }
        if ($name == &#039;lifetime&#039; &amp;&amp; empty($value)) {
            $value = null;
        }
        $this-&gt;_options[$name] = $value;
    }

    /**
     * Force a new lifetime
     *
     * The new value is set for the core/frontend but for the backend too (directive)
     *
     * @param  int $newLifetime New lifetime (in seconds)
     * @return void
     */
    public function setLifetime($newLifetime)
    {
        $this-&gt;_options[&#039;lifetime&#039;] = $newLifetime;
        $this-&gt;_backend-&gt;setDirectives(array(
            &#039;lifetime&#039; =&gt; $newLifetime
        ));
    }

    /**
     * Test if a cache is available for the given id and (if yes) return it (false else)
     *
     * @param  string  $id                     Cache id
     * @param  boolean $doNotTestCacheValidity If set to true, the cache validity won&#039;t be tested
     * @param  boolean $doNotUnserialize       Do not serialize (even if automatic_serialization is true) =&gt; for internal use
     * @return mixed|false Cached datas
     */
    public function load($id, $doNotTestCacheValidity = false, $doNotUnserialize = false)
    {
        if (!$this-&gt;_options[&#039;caching&#039;]) {
            return false;
        }
        $id = $this-&gt;_id($id); // cache id may need prefix
        $this-&gt;_lastId = $id;
        self::_validateIdOrTag($id);

        $this-&gt;_log(&quot;Zend_Cache_Core: load item &#039;{$id}&#039;&quot;, 7);
        $data = $this-&gt;_backend-&gt;load($id, $doNotTestCacheValidity);
        if ($data===false) {
            // no cache available
            return false;
        }
        if ((!$doNotUnserialize) &amp;&amp; $this-&gt;_options[&#039;automatic_serialization&#039;]) {
            // we need to unserialize before sending the result
            return unserialize($data);
        }
        return $data;
    }

    /**
     * Test if a cache is available for the given id
     *
     * @param  string $id Cache id
     * @return int|false Last modified time of cache entry if it is available, false otherwise
     */
    public function test($id)
    {
        if (!$this-&gt;_options[&#039;caching&#039;]) {
            return false;
        }
        $id = $this-&gt;_id($id); // cache id may need prefix
        self::_validateIdOrTag($id);
        $this-&gt;_lastId = $id;

        $this-&gt;_log(&quot;Zend_Cache_Core: test item &#039;{$id}&#039;&quot;, 7);
        return $this-&gt;_backend-&gt;test($id);
    }

    /**
     * Save some data in a cache
     *
     * @param  mixed $data           Data to put in cache (can be another type than string if automatic_serialization is on)
     * @param  string $id             Cache id (if not set, the last cache id will be used)
     * @param  array $tags           Cache tags
     * @param  int $specificLifetime If != false, set a specific lifetime for this cache record (null =&gt; infinite lifetime)
     * @param  int   $priority         integer between 0 (very low priority) and 10 (maximum priority) used by some particular backends
     * @throws Zend_Cache_Exception
     * @return boolean True if no problem
     */
    public function save($data, $id = null, $tags = array(), $specificLifetime = false, $priority = 8)
    {
        if (!$this-&gt;_options[&#039;caching&#039;]) {
            return true;
        }
        if ($id === null) {
            $id = $this-&gt;_lastId;
        } else {
            $id = $this-&gt;_id($id);
        }
        self::_validateIdOrTag($id);
        self::_validateTagsArray($tags);
        if ($this-&gt;_options[&#039;automatic_serialization&#039;]) {
            // we need to serialize datas before storing them
            $data = serialize($data);
        } else {
            if (!is_string($data)) {
                Zend_Cache::throwException(&quot;Datas must be string or set automatic_serialization = true&quot;);
            }
        }

        // automatic cleaning
        if ($this-&gt;_options[&#039;automatic_cleaning_factor&#039;] &gt; 0) {
            $rand = rand(1, $this-&gt;_options[&#039;automatic_cleaning_factor&#039;]);
            if ($rand==1) {
                //  new way                 || deprecated way
                if ($this-&gt;_extendedBackend || method_exists($this-&gt;_backend, &#039;isAutomaticCleaningAvailable&#039;)) {
                    $this-&gt;_log(&quot;Zend_Cache_Core::save(): automatic cleaning running&quot;, 7);
                    $this-&gt;clean(Zend_Cache::CLEANING_MODE_OLD);
                } else {
                    $this-&gt;_log(&quot;Zend_Cache_Core::save(): automatic cleaning is not available/necessary with current backend&quot;, 4);
                }
            }
        }

        $this-&gt;_log(&quot;Zend_Cache_Core: save item &#039;{$id}&#039;&quot;, 7);
        if ($this-&gt;_options[&#039;ignore_user_abort&#039;]) {
            $abort = ignore_user_abort(true);
        }
        if (($this-&gt;_extendedBackend) &amp;&amp; ($this-&gt;_backendCapabilities[&#039;priority&#039;])) {
            $result = $this-&gt;_backend-&gt;save($data, $id, $tags, $specificLifetime, $priority);
        } else {
            $result = $this-&gt;_backend-&gt;save($data, $id, $tags, $specificLifetime);
        }
        if ($this-&gt;_options[&#039;ignore_user_abort&#039;]) {
            ignore_user_abort($abort);
        }

        if (!$result) {
            // maybe the cache is corrupted, so we remove it !
            $this-&gt;_log(&quot;Zend_Cache_Core::save(): failed to save item &#039;{$id}&#039; -&gt; removing it&quot;, 4);
            $this-&gt;_backend-&gt;remove($id);
            return false;
        }

        if ($this-&gt;_options[&#039;write_control&#039;]) {
            $data2 = $this-&gt;_backend-&gt;load($id, true);
            if ($data!=$data2) {
                $this-&gt;_log(&quot;Zend_Cache_Core::save(): write control of item &#039;{$id}&#039; failed -&gt; removing it&quot;, 4);
                $this-&gt;_backend-&gt;remove($id);
                return false;
            }
        }

        return true;
    }

    /**
     * Remove a cache
     *
     * @param  string $id Cache id to remove
     * @return boolean True if ok
     */
    public function remove($id)
    {
        if (!$this-&gt;_options[&#039;caching&#039;]) {
            return true;
        }
        $id = $this-&gt;_id($id); // cache id may need prefix
        self::_validateIdOrTag($id);

        $this-&gt;_log(&quot;Zend_Cache_Core: remove item &#039;{$id}&#039;&quot;, 7);
        return $this-&gt;_backend-&gt;remove($id);
    }

    /**
     * Clean cache entries
     *
     * Available modes are :
     * &#039;all&#039; (default)  =&gt; remove all cache entries ($tags is not used)
     * &#039;old&#039;            =&gt; remove too old cache entries ($tags is not used)
     * &#039;matchingTag&#039;    =&gt; remove cache entries matching all given tags
     *                     ($tags can be an array of strings or a single string)
     * &#039;notMatchingTag&#039; =&gt; remove cache entries not matching one of the given tags
     *                     ($tags can be an array of strings or a single string)
     * &#039;matchingAnyTag&#039; =&gt; remove cache entries matching any given tags
     *                     ($tags can be an array of strings or a single string)
     *
     * @param  string       $mode
     * @param  array|string $tags
     * @throws Zend_Cache_Exception
     * @return boolean True if ok
     */
    public function clean($mode = &#039;all&#039;, $tags = array())
    {
        if (!$this-&gt;_options[&#039;caching&#039;]) {
            return true;
        }
        if (!in_array($mode, array(Zend_Cache::CLEANING_MODE_ALL,
                                   Zend_Cache::CLEANING_MODE_OLD,
                                   Zend_Cache::CLEANING_MODE_MATCHING_TAG,
                                   Zend_Cache::CLEANING_MODE_NOT_MATCHING_TAG,
                                   Zend_Cache::CLEANING_MODE_MATCHING_ANY_TAG))) {
            Zend_Cache::throwException(&#039;Invalid cleaning mode&#039;);
        }
        self::_validateTagsArray($tags);

        return $this-&gt;_backend-&gt;clean($mode, $tags);
    }

    /**
     * Return an array of stored cache ids which match given tags
     *
     * In case of multiple tags, a logical AND is made between tags
     *
     * @param array $tags array of tags
     * @return array array of matching cache ids (string)
     */
    public function getIdsMatchingTags($tags = array())
    {
        if (!$this-&gt;_extendedBackend) {
            Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
        }
        if (!($this-&gt;_backendCapabilities[&#039;tags&#039;])) {
            Zend_Cache::throwException(self::BACKEND_NOT_SUPPORTS_TAG);
        }

        $ids = $this-&gt;_backend-&gt;getIdsMatchingTags($tags);

        // we need to remove cache_id_prefix from ids (see #ZF-6178, #ZF-7600)
        if (isset($this-&gt;_options[&#039;cache_id_prefix&#039;]) &amp;&amp; $this-&gt;_options[&#039;cache_id_prefix&#039;] !== &#039;&#039;) {
            $prefix    = &amp; $this-&gt;_options[&#039;cache_id_prefix&#039;];
            $prefixLen = strlen($prefix);
            foreach ($ids as &amp;$id) {
                if (strpos($id, $prefix) === 0) {
                    $id = substr($id, $prefixLen);
                }
            }
        }

        return $ids;
    }

    /**
     * Return an array of stored cache ids which don&#039;t match given tags
     *
     * In case of multiple tags, a logical OR is made between tags
     *
     * @param array $tags array of tags
     * @return array array of not matching cache ids (string)
     */
    public function getIdsNotMatchingTags($tags = array())
    {
        if (!$this-&gt;_extendedBackend) {
            Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
        }
        if (!($this-&gt;_backendCapabilities[&#039;tags&#039;])) {
            Zend_Cache::throwException(self::BACKEND_NOT_SUPPORTS_TAG);
        }

        $ids = $this-&gt;_backend-&gt;getIdsNotMatchingTags($tags);

        // we need to remove cache_id_prefix from ids (see #ZF-6178, #ZF-7600)
        if (isset($this-&gt;_options[&#039;cache_id_prefix&#039;]) &amp;&amp; $this-&gt;_options[&#039;cache_id_prefix&#039;] !== &#039;&#039;) {
            $prefix    = &amp; $this-&gt;_options[&#039;cache_id_prefix&#039;];
            $prefixLen = strlen($prefix);
            foreach ($ids as &amp;$id) {
                if (strpos($id, $prefix) === 0) {
                    $id = substr($id, $prefixLen);
                }
            }
        }

        return $ids;
    }

    /**
     * Return an array of stored cache ids which match any given tags
     *
     * In case of multiple tags, a logical OR is made between tags
     *
     * @param array $tags array of tags
     * @return array array of matching any cache ids (string)
     */
    public function getIdsMatchingAnyTags($tags = array())
    {
        if (!$this-&gt;_extendedBackend) {
            Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
        }
        if (!($this-&gt;_backendCapabilities[&#039;tags&#039;])) {
            Zend_Cache::throwException(self::BACKEND_NOT_SUPPORTS_TAG);
        }

        $ids = $this-&gt;_backend-&gt;getIdsMatchingAnyTags($tags);

        // we need to remove cache_id_prefix from ids (see #ZF-6178, #ZF-7600)
        if (isset($this-&gt;_options[&#039;cache_id_prefix&#039;]) &amp;&amp; $this-&gt;_options[&#039;cache_id_prefix&#039;] !== &#039;&#039;) {
            $prefix    = &amp; $this-&gt;_options[&#039;cache_id_prefix&#039;];
            $prefixLen = strlen($prefix);
            foreach ($ids as &amp;$id) {
                if (strpos($id, $prefix) === 0) {
                    $id = substr($id, $prefixLen);
                }
            }
        }

        return $ids;
    }

    /**
     * Return an array of stored cache ids
     *
     * @return array array of stored cache ids (string)
     */
    public function getIds()
    {
        if (!$this-&gt;_extendedBackend) {
            Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
        }

        $ids = $this-&gt;_backend-&gt;getIds();

        // we need to remove cache_id_prefix from ids (see #ZF-6178, #ZF-7600)
        if (isset($this-&gt;_options[&#039;cache_id_prefix&#039;]) &amp;&amp; $this-&gt;_options[&#039;cache_id_prefix&#039;] !== &#039;&#039;) {
            $prefix    = &amp; $this-&gt;_options[&#039;cache_id_prefix&#039;];
            $prefixLen = strlen($prefix);
            foreach ($ids as &amp;$id) {
                if (strpos($id, $prefix) === 0) {
                    $id = substr($id, $prefixLen);
                }
            }
        }

        return $ids;
    }

    /**
     * Return an array of stored tags
     *
     * @return array array of stored tags (string)
     */
    public function getTags()
    {
        if (!$this-&gt;_extendedBackend) {
            Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
        }
        if (!($this-&gt;_backendCapabilities[&#039;tags&#039;])) {
            Zend_Cache::throwException(self::BACKEND_NOT_SUPPORTS_TAG);
        }
        return $this-&gt;_backend-&gt;getTags();
    }

    /**
     * Return the filling percentage of the backend storage
     *
     * @return int integer between 0 and 100
     */
    public function getFillingPercentage()
    {
        if (!$this-&gt;_extendedBackend) {
            Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
        }
        return $this-&gt;_backend-&gt;getFillingPercentage();
    }

    /**
     * Return an array of metadatas for the given cache id
     *
     * The array will include these keys :
     * - expire : the expire timestamp
     * - tags : a string array of tags
     * - mtime : timestamp of last modification time
     *
     * @param string $id cache id
     * @return array array of metadatas (false if the cache id is not found)
     */
    public function getMetadatas($id)
    {
        if (!$this-&gt;_extendedBackend) {
            Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
        }
        $id = $this-&gt;_id($id); // cache id may need prefix
        return $this-&gt;_backend-&gt;getMetadatas($id);
    }

    /**
     * Give (if possible) an extra lifetime to the given cache id
     *
     * @param string $id cache id
     * @param int $extraLifetime
     * @return boolean true if ok
     */
    public function touch($id, $extraLifetime)
    {
        if (!$this-&gt;_extendedBackend) {
            Zend_Cache::throwException(self::BACKEND_NOT_IMPLEMENTS_EXTENDED_IF);
        }
        $id = $this-&gt;_id($id); // cache id may need prefix

        $this-&gt;_log(&quot;Zend_Cache_Core: touch item &#039;{$id}&#039;&quot;, 7);
        return $this-&gt;_backend-&gt;touch($id, $extraLifetime);
    }

    /**
     * Validate a cache id or a tag (security, reliable filenames, reserved prefixes...)
     *
     * Throw an exception if a problem is found
     *
     * @param  string $string Cache id or tag
     * @throws Zend_Cache_Exception
     * @return void
     */
    protected static function _validateIdOrTag($string)
    {
        if (!is_string($string)) {
            Zend_Cache::throwException(&#039;Invalid id or tag : must be a string&#039;);
        }
        if (substr($string, 0, 9) == &#039;internal-&#039;) {
            Zend_Cache::throwException(&#039;&quot;internal-*&quot; ids or tags are reserved&#039;);
        }
        if (!preg_match(&#039;~^[a-zA-Z0-9_]+$~D&#039;, $string)) {
            Zend_Cache::throwException(&quot;Invalid id or tag &#039;$string&#039; : must use only [a-zA-Z0-9_]&quot;);
        }
    }

    /**
     * Validate a tags array (security, reliable filenames, reserved prefixes...)
     *
     * Throw an exception if a problem is found
     *
     * @param  array $tags Array of tags
     * @throws Zend_Cache_Exception
     * @return void
     */
    protected static function _validateTagsArray($tags)
    {
        if (!is_array($tags)) {
            Zend_Cache::throwException(&#039;Invalid tags array : must be an array&#039;);
        }
        foreach($tags as $tag) {
            self::_validateIdOrTag($tag);
        }
        reset($tags);
    }

    /**
     * Make sure if we enable logging that the Zend_Log class
     * is available.
     * Create a default log object if none is set.
     *
     * @throws Zend_Cache_Exception
     * @return void
     */
    protected function _loggerSanity()
    {
        if (!isset($this-&gt;_options[&#039;logging&#039;]) || !$this-&gt;_options[&#039;logging&#039;]) {
            return;
        }

        if (isset($this-&gt;_options[&#039;logger&#039;]) &amp;&amp; $this-&gt;_options[&#039;logger&#039;] instanceof Zend_Log) {
            return;
        }

        // Create a default logger to the standard output stream
        //--//require_once &#039;Zend/Log.php&#039;;
        //--//require_once &#039;Zend/Log/Writer/Stream.php&#039;;
        //--//require_once &#039;Zend/Log/Filter/Priority.php&#039;;
        $logger = new Zend_Log(new Zend_Log_Writer_Stream(&#039;php://output&#039;));
        $logger-&gt;addFilter(new Zend_Log_Filter_Priority(Zend_Log::WARN, &#039;&lt;=&#039;));
        $this-&gt;_options[&#039;logger&#039;] = $logger;
    }

    /**
     * Log a message at the WARN (4) priority.
     *
     * @param string $message
     * @throws Zend_Cache_Exception
     * @return void
     */
    protected function _log($message, $priority = 4)
    {
        if (!$this-&gt;_options[&#039;logging&#039;]) {
            return;
        }
        if (!(isset($this-&gt;_options[&#039;logger&#039;]) || $this-&gt;_options[&#039;logger&#039;] instanceof Zend_Log)) {
            Zend_Cache::throwException(&#039;Logging is enabled but logger is not set&#039;);
        }
        $logger = $this-&gt;_options[&#039;logger&#039;];
        $logger-&gt;log($message, $priority);
    }

    /**
     * Make and return a cache id
     *
     * Checks &#039;cache_id_prefix&#039; and returns new id with prefix or simply the id if null
     *
     * @param  string $id Cache id
     * @return string Cache id (with or without prefix)
     */
    protected function _id($id)
    {
        if (($id !== null) &amp;&amp; isset($this-&gt;_options[&#039;cache_id_prefix&#039;])) {
            return $this-&gt;_options[&#039;cache_id_prefix&#039;] . $id; // return with prefix
        }
        return $id; // no prefix, just return the $id passed
    }

}
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