array( 'author' => array( array('John Doe', 'attributes' => array('id' => 1)), array('Bob Jones', 'attributes' =>array('id' => 2)) ), 'title' => 'Title of the book' ) ); $s = new XML_Serializer(); $s->setOption(XML_SERIALIZER_OPTION_INDENT, ' '); $s->setOption(XML_SERIALIZER_OPTION_ATTRIBUTES_KEY, 'attributes'); $s->setOption(XML_SERIALIZER_OPTION_MODE, XML_SERIALIZER_MODE_SIMPLEXML); $s->serialize($citation); echo '

';
echo htmlentities($s->getSerializedData());
echo '

'; ?>