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<?php

$classes = get_declared_classes();

if( in_array('SimpleXMLElement', $classes) ) {
    $xmldoc = simplexml_load_file('myfile.xml');

} elseif( in_array('DOMDocument', $classes) )
{
    $xmldoc = new DOMDocument();
    $xmldoc->load('myfile.xml');

} else {
}
?>