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(PHP 5 >= 5.1.2)
XMLReader::isValid — Indicates if the parsed document is valid
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'); // You must to use it $xml->setParserProperty(XMLReader::VALIDATE, true); var_dump($xml->isValid()); ?>