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(PHP 5 >= 5.1.0, PHP 7, PHP 8)

XMLReader::expandReturns a copy of the current node as a DOM object


public XMLReader::expand(?DOMNode $baseNode = null): DOMNode|false

This method copies the current node and returns the appropriate DOM object.



A DOMNode defining the target DOMDocument for the created DOM object.

Return Values

The resulting DOMNode or false on error.

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User Contributed Notes 1 note

2 years ago
XMLReader::expand() expands the current subtree to DOM. SimpleXML is good too. To avoid a warning like "Imported Node must have associated Document" when using simplexml_import_dom(), we can do :


// Huge XML compressed file
$xml = XMLReader::open('compress.zlib:///path/to/my-data.xml.gz');

// Targeting a tiny subtree
while ($xml->name !== 'my-targeted-element') {

// The trick is here...
// Subtree is expanded in an empty document...
$dom = $xml->expand(new DOMDocument());

// ... which can be imported by SimpleXML
$sx = simplexml_import_dom($dom);

// We can now process our tiny subtree with SimpleXML $sx
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