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<?php

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/**

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* SimplePie

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* A PHP-Based RSS and Atom Feed Framework.

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* Takes the hard work out of managing a complete RSS/Atom solution.

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* Redistribution and use in source and binary forms, with or without modification, are

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* permitted provided that the following conditions are met:

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* * Redistributions of source code must retain the above copyright notice, this list of

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* conditions and the following disclaimer.

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* * Redistributions in binary form must reproduce the above copyright notice, this list

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* of conditions and the following disclaimer in the documentation and/or other materials

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* provided with the distribution.

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* * Neither the name of the SimplePie Team nor the names of its contributors may be used

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* to endorse or promote products derived from this software without specific prior

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* written permission.

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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY EXPRESS

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* OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY

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* AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDERS

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* AND CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR

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* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

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* SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY

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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR

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* OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE

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* POSSIBILITY OF SUCH DAMAGE.

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* @package SimplePie

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* @author Ryan Parman

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* @author Sam Sneddon

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* @author Ryan McCue

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* @link http://simplepie.org/ SimplePie

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* @license http://www.opensource.org/licenses/bsd-license.php BSD License

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/**

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* Base class for database-based caches

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* @package SimplePie

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* @subpackage Caching

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abstract class SimplePie_Cache_DB implements SimplePie_Cache_Base

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{

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/**

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* Helper for database conversion

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* Converts a given {@see SimplePie} object into data to be stored

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* @param SimplePie $data

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* @return array First item is the serialized data for storage, second item is the unique ID for this item

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protected static function prepare_simplepie_object_for_cache($data)

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{

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$items = $data->get_items();

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$items_by_id = array();

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if (!empty($items))

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{

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foreach ($items as $item)

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{

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$items_by_id[$item->get_id()] = $item;

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}

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if (count($items_by_id) !== count($items))

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{

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$items_by_id = array();

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foreach ($items as $item)

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{

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$items_by_id[$item->get_id(true)] = $item;

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}

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}

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if (isset($data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed'][0]))

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{

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$channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['feed'][0];

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}

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elseif (isset($data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed'][0]))

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{

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$channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['feed'][0];

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}

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elseif (isset($data->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0]))

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{

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$channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_RDF]['RDF'][0];

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}

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elseif (isset($data->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_20]['channel'][0]))

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{

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$channel =& $data->data['child'][SIMPLEPIE_NAMESPACE_RSS_20]['rss'][0]['child'][SIMPLEPIE_NAMESPACE_RSS_20]['channel'][0];

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}

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else

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{

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$channel = null;

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}

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if ($channel !== null)

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{

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if (isset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['entry']))

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{

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unset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_10]['entry']);

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}

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if (isset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['entry']))

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{

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unset($channel['child'][SIMPLEPIE_NAMESPACE_ATOM_03]['entry']);

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}

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if (isset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_10]['item']))

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{

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unset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_10]['item']);

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}

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if (isset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_090]['item']))

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{

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unset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_090]['item']);

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}

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if (isset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_20]['item']))

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{

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unset($channel['child'][SIMPLEPIE_NAMESPACE_RSS_20]['item']);

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}

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}

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if (isset($data->data['items']))

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{

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unset($data->data['items']);

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}

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if (isset($data->data['ordered_items']))

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{

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unset($data->data['ordered_items']);

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}

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}

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return array(serialize($data->data), $items_by_id);

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}

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}

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