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<?php class CustomDOMDocument extends DOMDocument { } function localScope() { $doc = new CustomDOMDocument; $doc->loadHtml('<p>Test123</p>'); $xpath = new DOMXPath($doc); return $xpath; } $doc = new CustomDOMDocument; $doc->loadHtml('<p>Test123</p>'); $xpath = new DOMXPath($doc); var_dump(get_class($xpath->document)); $xpath = new DOMXPath(new CustomDOMDocument); var_dump(get_class($xpath->document)); $xpath = localScope(); var_dump(get_class($xpath->document));
Output for 5.6.0 - 5.6.26, 7.0.0 - 7.0.20, 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.30, 8.0.0 - 8.0.22, 8.1.0 - 8.1.9
string(17) "CustomDOMDocument" string(11) "DOMDocument" string(11) "DOMDocument"

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