(PHP 5 >= 5.1.0, PHP 7)
XMLReader::isValid — Indicates if the parsed document is valid
public XMLReader::isValid ( ) : bool
Returns a boolean indicating if the document being parsed is currently valid.
Returns true on success or false on failure.
Example #1 Validating XML
<?php
$xml = XMLReader::open('test.xml');
// The validate parser option must be enabled for
// this method to work properly
$xml->setParserProperty(XMLReader::VALIDATE, true);
var_dump($xml->isValid());
?> Note: This checks the current node, not the entire document.
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https://www.php.net/manual/en/xmlreader.isvalid.php