1.xml:
127.0.0.1
php:
$xmlstr = file_get_contents('1.xml');
$users = new SimpleXMLElement($xmlstr);
$user = $users->addChild('user');
$user->addChild('email', 'test');
$user->addChild('time', 'test');
$user->addChild('ip', '127.0.0.1');
$users->asXML();
file_put_contents('1.xml', $users->asXML());
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