有没有一种简单的方法来创建一个自定义的PHP XML编写器函数？

function createCustomXML($data) {
    $xml = xmlwriter_open_memory();
    xmlwriter_start_document($xml, '1.0', 'UTF-8');
    
    xmlwriter_start_element($xml, 'root');
    
    foreach ($data as $key => $value) {
        xmlwriter_start_element($xml, $key);
        xmlwriter_text($xml, $value);
        xmlwriter_end_element($xml);
    }
    
    xmlwriter_end_element($xml);
    xmlwriter_end_document($xml);
    
    return xmlwriter_output_memory($xml);
}

// 示例用法
$data = array(
    'name' => 'John Doe',
    'age' => 30,
    'email' => 'johndoe@example.com'
);

$xmlString = createCustomXML($data);
echo $xmlString;