PHPWales 2020 - June 3rd to June 4th

XMLReader::isValid

(PHP 5 >= 5.1.0, PHP 7)

XMLReader::isValidパースしているドキュメントの妥当性を示す

説明

public XMLReader::isValid ( void ) : bool

パースしているドキュメントが妥当なものであるかどうかを論理型で返します。

返り値

成功した場合に TRUE を、失敗した場合に FALSE を返します。

例1 XML の妥当性の検証

<?php
$xml 
XMLReader::open('test.xml');

// validate オプションを有効にしておかないと、
// このメソッドは正しく動作しません
$xml->setParserProperty(XMLReader::VALIDATEtrue);

var_dump($xml->isValid());
?>

注意

注意: このメソッドは、現在のノードだけをチェックします。ドキュメント全体をチェックするわけではありません。

参考

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User Contributed Notes 3 notes

up
3
zubin at trattonuovo dot com
9 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";
  exit();
}

libxml_use_internal_errors(TRUE);

$xml_array = xml2assoc($xml);

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

//all ok
up
2
remy dot damour at laposte dot net
10 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
up
-2
anzenews at volja dot net
11 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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