3v4l.org

run code in 300+ PHP versions simultaneously
<?php $xmlstr = " <employee> <employeename>test</employeename> <employeeaddress>test123</employeeaddress> <SSN>12343456</SSN> <company>TOPXML</company> </employee> "; $dom = new \DOMDocument; $dom->loadXML($xmlstr); $node = $dom->firstChild->firstChild; $node->normalize(); echo $dom->C14N(); echo $node->C14N(); ?>
Output for 5.6.38, 7.1.0 - 7.1.25, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.27, 8.2.0 - 8.2.17, 8.3.0 - 8.3.4
<employee> <employeename>test</employeename> <employeeaddress>test123</employeeaddress> <SSN>12343456</SSN> <company>TOPXML</company> </employee>

preferences:
161.28 ms | 403 KiB | 174 Q