将SimpleXML对象转换为数组

Question

我碰到SimpleXML对象转换为阵列的这种功能在这里：

/**
 * function object2array - A simpler way to transform the result into an array 
 *   (requires json module).
 *
 * This function is part of the PHP manual.
 *
 * The PHP manual text and comments are covered by the Creative Commons 
 * Attribution 3.0 License, copyright (c) the PHP Documentation Group
 *
 * @author  Diego Araos, diego at klapmedia dot com
 * @date    2011-02-05 04:57 UTC
 * @link    http://www.php.net/manual/en/function.simplexml-load-string.php#102277
 * @license http://www.php.net/license/index.php#doc-lic
 * @license http://creativecommons.org/licenses/by/3.0/
 * @license CC-BY-3.0 <http://spdx.org/licenses/CC-BY-3.0>
 */
function object2array($object)
{
    return json_decode(json_encode($object), TRUE); 
}

因此，我对XML字符串的采用类似于：

function xmlstring2array($string)
{
    $xml   = simplexml_load_string($string, 'SimpleXMLElement', LIBXML_NOCDATA);

    $array = json_decode(json_encode($xml), TRUE);

    return $array;
}

它工作得很好，但似乎有点黑吗？有没有更有效/更强大的方法来做到这一点？

我知道SimpleXML对象与数组足够接近，因为它利用了PHP中的ArrayAccess接口，但与多维数组（即循环）一起使用时，仍然不能很好地工作。

谢谢大家的帮助

Answer 1

我在PHP手册注释中找到了这个：

/**
 * function xml2array
 *
 * This function is part of the PHP manual.
 *
 * The PHP manual text and comments are covered by the Creative Commons 
 * Attribution 3.0 License, copyright (c) the PHP Documentation Group
 *
 * @author  k dot antczak at livedata dot pl
 * @date    2011-04-22 06:08 UTC
 * @link    http://www.php.net/manual/en/ref.simplexml.php#103617
 * @license http://www.php.net/license/index.php#doc-lic
 * @license http://creativecommons.org/licenses/by/3.0/
 * @license CC-BY-3.0 <http://spdx.org/licenses/CC-BY-3.0>
 */
function xml2array ( $xmlObject, $out = array () )
{
    foreach ( (array) $xmlObject as $index => $node )
        $out[$index] = ( is_object ( $node ) ) ? xml2array ( $node ) : $node;

    return $out;
}

它可以帮助您。但是，如果将XML转换为数组，则会丢失可能存在的所有属性，因此无法返回XML并获得相同的XML。