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<?php
$contxml = <<<XML
<root>
<collection id="new1">
<category>aaa</category>
</collection>
</root>
XML;
require(dirname(__FILE__)."/xmlparse.php");
$cont = parse_xml_config($contxml,"root");
$keys = array_keys($cont);
$key1 = array_keys($cont['collection']);
print_r($cont); #Array ( [collection] => Array ( [category] => aaa ) [encoding] => UTF-8 )
print_r($keys); #Array ( [0] => collection [1] => encoding )
print_r($key1); #Array ( [0] => category )
?>