- var_dump: documentation ( source)
<?php
$xml = <<<XML
<item is-foo="false" is-bar="false">
<item is-bar="true">
<item>
<item is-foo="true">
<item />
<item is-foo="true" />
</item>
</item>
<item is-foo="true" is-bar="true" />
</item>
</item>
XML;
$schema = <<<SCHEMA
<xs:schema elementFormDefault="qualified" xmlns:xs="http://www.w3.org/2001/XMLSchema">
<xs:element name="item">
<xs:complexType>
<xs:sequence>
<xs:element ref="item" minOccurs="0" maxOccurs="unbounded" />
</xs:sequence>
<xs:attribute name="is-foo" type="xs:boolean" default="true" use="optional" />
<xs:attribute name="is-bar" type="xs:boolean" default="false" use="optional" />
</xs:complexType>
</xs:element>
</xs:schema>
SCHEMA;
$document = new DOMDocument();
$document->loadXML($xml);
var_dump($document->schemaValidateSource($schema, LIBXML_SCHEMA_CREATE));
$xpath = new DOMXPath($document);
foreach ($xpath->query('//item') as $item) {
echo $item->getNodePath() . PHP_EOL
. ' is-foo : ' . $item->getAttribute('is-foo') . PHP_EOL
. ' is-bar : ' . $item->getAttribute('is-bar') . PHP_EOL;
}