</ attribute>中的PHP空白字段

I´m wondering how to return a empy value into my "attribute" in case the final user doesn´t fill in the form field called "name" and leave it blank.

My actual code:

$domElement = $domDocument->createElement('attribute', $posted_data['name']);
$domAttribute = $domDocument->createAttribute('domainname');
$domAttribute->value = 'Name';
$domElement->appendChild($domAttribute);

Desired ouput in case of empty input in the form field "name":

<attribute domainname="Name"></attribute>

Current output based on the actual code:

<attribute domainname="Name"/>

As you can see, it´s not being completed by </attribute> but just />

Any clue?

You can use const LIBXML_NOEMPTYTAG

<?php
$domDocument = new DOMDocument;
$domElement = $domDocument->createElement('attribute');

$domAttribute = $domDocument->createAttribute('domainname');
$domAttribute->value = 'Name';

$domElement->appendChild($domAttribute);

echo $domDocument->saveXML($domElement, LIBXML_NOEMPTYTAG), PHP_EOL;

http://php.net/manual/en/libxml.constants.php#constant.libxml-noemptytag