Strip Specific HTML/XML tag attributes

strip-specific-tag-attribute.php

<?php
// Based and altered from https://www.py4u.net/discuss/24287 

function strip_tag_attributes( $html, $tag, $attr ) {
	$domd = new DOMDocument();
	libxml_use_internal_errors( true );
	$domd->loadXML( $html );
	libxml_use_internal_errors( false) ;
	$domx = new DOMXPath( $domd );
	$items = $domx->query('//' . $tag . '[@' . $attr . ']');
	foreach( $items as $item ) {
		$item->removeAttribute( $attr );
	}
	return( $domd->saveXML() );
}

So:

$empty = strip_tag_attributes( '', 'input', 'value' );

will provide the empty value tag (no value attribute