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Php: dom replace node with root node from another dom

I need to update node, from whole node from another document:

Original XML:

<a>
<b>Bat</b>
</a>

The output I want:

<a>
<b>bi</b>
</a>

first attempt: replace with documentfragment

    $original = "<a>
    <b>Bat</b>
    </a>";
    $replace = "<b>Bi</b>";

    $dom = new DOMDocument('1.0', 'utf-8');
    $dom->loadXML($original);

    $xpath = new DOMXpath($dom);
    $b = $xpath->query('//b')->item(0);

    $fragment = $dom->createDocumentFragment();
    $fragment->appendXML($replace);

    $dom->replaceChild($fragment, $b);

    echo $dom->saveXML();

ERROR:

Fatal error: throw a “DOMException” exception with the message “Not Found” Error 'in / home / zital / scripts / php / dom.php: 17 Stack trace:

0 / home / zital / scripts / php / dom.php (17): DOMNode-> replaceChild (Object (DOMDocumentFragment), Object (DOMElement))

1 {main} is thrown in /home/zital/scripts/php/dom.php on line 17

second attempt: replace by importing node

$original = "<a>
        <b>Bat</b>
</a>";
$replace = "<b>Bi</b>";

$dom = new DOMDocument('1.0', 'utf-8');
$dom->loadXML($original);

$xpath = new DOMXpath($dom);
$b = $xpath->query('//b')->item(0);

$dom2 = new DOMDocument('1.0', 'utf-8');
$dom2->loadXML($replace);

$replace = $dom2->documentElement;
$replace = $dom->importNode($replace, true);

$dom->replaceChild($replace, $b);

echo $dom->saveXML();

ERROR:

Fatal error: throw a “DOMException” exception with the message “Not Found” Error 'in / home / zital / scripts / php / dom.php: 42 Stack trace:

0/home/zital/scripts/php/dom.php(42): DOMNode- > replaceChild ( (DOMElement), (DOMElement))

1 {main} /home/zital/scripts/php/dom.php 42

+4
1

, documentElement

$dom->documentElement->replaceChild($replace, $b);


<?xml version="1.0"?>
<a><b>Bi</b></a>

UPD:

,

$b->parentNode->replaceChild($replace, $b);
+1

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