(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.
Note: This checks the current node, not the entire document.
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https://www.php.net/manual/en/xmlreader.isvalid.php