How to parse or download a large xml file in php?

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$xmlFile = 'large_xml_file.xml';
$xml = simplexml_load_file($xmlFile);

foreach ($xml->children() as $child) {
    // Do something with each child node
}

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$xmlFile = 'http://example.com/large_xml_file.xml';
$destinationFile = 'downloaded_xml_file.xml';

$ch = curl_init();
$fp = fopen($destinationFile, 'w');

curl_setopt($ch, CURLOPT_URL, $xmlFile);
curl_setopt($ch, CURLOPT_FILE, $fp);

curl_exec($ch);

curl_close($ch);
fclose($fp);