PHP xml2js (attributes to $, nodeValue to _)

xml2js.php

<?php

function xml2js($xmlnode)
{
	$root = func_num_args() <= 1;
	$jsnode = [];

	if ($root) {
		$nodename = $xmlnode->getName();
		$jsnode[$nodename] = xml2js($xmlnode, true);
		return json_encode($jsnode, JSON_PRETTY_PRINT);
	}

	if (count($xmlnode->attributes()) > 0) {
		$jsnode["$"] = [];
		foreach ($xmlnode->attributes() as $key => $value) {
			$jsnode["$"][$key] = (string)$value;
		}
	}

	$textcontent = trim((string)$xmlnode);
	if ($textcontent) {
		$jsnode["_"] = $textcontent;
		return $jsnode;
	}

	foreach ($xmlnode->children() as $childxmlnode) {
		$childname = $childxmlnode->getName();
		$jsnode[$childname][] = xml2js($childxmlnode, true);
	}
	return $jsnode;
}