3v4l.org

run code in 300+ PHP versions simultaneously
<?php $dom = new DOMDocument; $outer = $dom->appendChild($dom->createElementNS("urn:a", "outer")); $outer->appendChild($dom->createElement("inner")); echo $dom->saveXML();
Output for 8.1.0 - 8.1.28, 8.2.0 - 8.2.18, 8.3.0 - 8.3.7
<?xml version="1.0"?> <outer xmlns="urn:a"><inner/></outer>
preferences:
89.41 ms | 402 KiB | 61 Q