$d->appendChild($t3 = $xml->createTextNode(" t3 "));
$d->appendChild($b = $xml->createElement("b"));
$b->appendChild($xml->createElement("X"));
$d->appendChild($t4 = $xml->createTextNode(" t4 "));
$d->appendChild($xml->createTextNode(" xxx "));
echo "\ndiv:\n";
print_node_r($d);
echo "\nInsert t4 before t3:\n";
$ret = $d->insertBefore($t4, $t3);
print_node_r($d);
echo "\n";
$frag = $xml->createDocumentFragment();
$t5 = $frag->appendChild($xml->createTextNode(" t5 "));
$frag->appendChild($i = $xml->createElement("i"));
$i->appendChild($xml->createTextNode(" frob "));
$frag->appendChild($xml->createTextNOde(" t6 "));
echo "\np:\n";
print_node_r($p);
echo "\nFragment:\n";
print_node_r($frag);
echo "\nAppending fragment to p:\n";
$p->appendChild($frag);
print_node_r($p);
echo "\nFragment:\n";
print_node_r($frag);
echo "\ndiv:\n";
print_node_r($d);
echo "\nInserting fragment before t4\n";
$d->insertBefore($frag, $t4);
print_node_r($d);
echo "\np:\n";