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1 lars 1 
<?PHP
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/**
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 * This example demonstrates the use of
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 * ignoreNull => true
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 *
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 * It can be used to serialize an indexed array
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 * like ext/simplexml does, by using the name
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 * of the parent tag, while omitting this tag.
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 *
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 * @author Stephan Schmidt <schst@php.net>
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 */
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error_reporting(E_ALL);
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require_once 'XML/Serializer.php';
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$options = array(
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                    "indent"         => '    ',
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                    "linebreak"      => "\n",
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                );
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$serializer = new XML_Serializer($options);
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$object = new stdClass();
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$object->foo = 'bar';
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$object->bar = null;
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$array = array(
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                'foo' => 'bar',
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                'bar' => null
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            );
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$result = $serializer->serialize($object);
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if ($result === true) {
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    echo "<pre>";
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    echo htmlentities($serializer->getSerializedData());
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    echo "</pre>";
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}
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$result = $serializer->serialize($array);
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if ($result === true) {
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    echo "<pre>";
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    echo htmlentities($serializer->getSerializedData());
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    echo "</pre>";
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}
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$serializer->setOption('ignoreNull', true);
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$result = $serializer->serialize($object);
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if ($result === true) {
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    echo "<pre>";
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    echo htmlentities($serializer->getSerializedData());
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    echo "</pre>";
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}
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$result = $serializer->serialize($array);
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if ($result === true) {
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    echo "<pre>";
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    echo htmlentities($serializer->getSerializedData());
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    echo "</pre>";
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}
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?>