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(PHP 5 >= 5.1.0, PHP 7)

XMLReader::isValidIndique si le document analysé est valide


public bool XMLReader::isValid ( void )

Retourne un booléen indiquant si le document qui est en train d'être analysé est valide.

Valeurs de retour

Cette fonction retourne TRUE en cas de succès ou FALSE si une erreur survient.


Exemple #1 Validation XML


// L'option de validation de l'analyseur doit être
// active pour que cette méthode fonctionne correctement



Note: Cette méthode vérifie le noeud courant, et non le document complet.

Voir aussi

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User Contributed Notes 3 notes

zubin at trattonuovo dot com
7 years ago
I encountered some problems to use isValid method with xml2assoc function.
I use this way to validate the entire xml file and put it into an associative array.

$xml = new XMLReader();
if (!$xml->xml($xml_string, NULL, LIBXML_DTDVALID)) {
  echo "XML not valid: load error";


$xml_array = xml2assoc($xml);

$arErrors = libxml_get_errors();
$xml_errors = "";
foreach ($arErrors AS $xmlError) $xml_errors .= $xmlError->message;
if ($xml_errors != "") {
  echo "XML not valid: ".$xml_errors;

//all ok
remy dot damour at laposte dot net
8 years ago
1. If you validate against relax-ng, no need to call $xml->setParserProperty(XMLReader::VALIDATE, true);

2. Be aware that $xml->isValid() will return validity for currently active node (ie. node currently positioned using $xml->read()). It won't check validity of your entire tree at once, but rather on a step by step basis
anzenews at volja dot net
9 years ago
This comment is only partially correct:
"isValid() always returns false unless you enable checking for validity by $reader->setParserProperty(XMLReader::VALIDATE, true);"
This enables DTD checking, but you can also check by using RelaxNG (see setRelaxNGSchema() and setRelaxNGSchemaSource()).

And also, this is NOT correct:
"If you just need to check if XML file is well formed, successful loading into XMLReader object is usually enough."
It is not enough. Pull parsers operate on stream and if you have a large enough file they will not know it is well formed until it is read to the end. If you need to know if it is well formed or/and valid, read it till the end or validation error (you can use next() for fast reading if you don't care about contents).
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