PHP SimpleXML函数错误

时间:2012-01-14 16:37:59

标签: php simplexml

我正在使用此类将数组移植到XML:

class ArrayToXML
{
    /**
     * The main function for converting to an XML document.
     * Pass in a multi dimensional array and this recrusively loops through and builds up an XML document.
     *
     * @param array $data
     * @param string $rootNodeName - what you want the root node to be - defaultsto data.
     * @param SimpleXMLElement $xml - should only be used recursively
     * @return string XML
     */
    public static function toXml($data, $rootNodeName = 'data', &$xml=null)
    {
        // turn off compatibility mode as simple xml throws a wobbly if you don't.
        if (ini_get('zend.ze1_compatibility_mode') == 1)
        {
            ini_set ('zend.ze1_compatibility_mode', 0);
        }

        if (is_null($xml))
        {
            $xml = simplexml_load_string("");
        }

        // loop through the data passed in.
        foreach($data as $key => $value)
        {
            // if numeric key, assume array of rootNodeName elements
            if (is_numeric($key))
            {
                $key = $rootNodeName;
            }

            // delete any char not allowed in XML element names
            $key = preg_replace('/[^a-z0-9\-\_\.\:]/i', '', $key);

            // if there is another array found recrusively call this function
            if (is_array($value))
            {
                // create a new node unless this is an array of elements
                $node = ArrayToXML::isAssoc($value) ? $xml->addChild($key) : $xml;

                // recrusive call - pass $key as the new rootNodeName
                ArrayToXML::toXml($value, $key, $node);
            }
            else
            {
                // add single node.
                $value = htmlentities($value);
                $xml->addChild($key,$value);
            }

        }
        // pass back as string. or simple xml object if you want!
        return $xml->asXML();
    }

    // determine if a variable is an associative array
    public static function isAssoc( $array ) {
        return (is_array($array) && 0 !== count(array_diff_key($array, array_keys(array_keys($array)))));
    }
}

我正在使用此代码示例调用此函数只是为了测试一下:

require_once('test_xml.php');
$library = array(
    'book' => array(
        array(
            'authorFirst' => 'Mark',
            'authorLast' => 'Twain',
            'title' => 'The Innocents Abroad'
        ),
        array(
            'authorFirst' => 'Charles',
            'authorLast' => 'Dickens',
            'title' => 'Oliver Twist'
        )
    )
);
$ArrayToXml=new ArrayToXml();
$ArrayToXml->toXml($library)

我收到此错误:致命错误:在第42行的非对象上调用成员函数addChild()。

知道出了什么问题吗? 谢谢。

编辑: 第42行:$ node = ArrayToXML :: isAssoc($ value)? $ xml-> addChild($ key):$ xml;

EDIT2: 尊重所有人,这段代码还没有完成。答案是正确的,但我只得到MarkTwainCharlesDickens作为输出。我应该得到正确形成的XML。我应该启用一些扩展吗?但我已经看到simplexml已启用。

感谢任何帮助。

1 个答案:

答案 0 :(得分:2)

您无法使用空字符串创建XML文档。

var_dump(simplexml_load_string(""));
bool(false)

VS

var_dump(simplexml_load_string("<root/>"));
object(SimpleXMLElement)#1 (0) {}

book获取$data值:

$root = key($data);
$rootNode = "<{$root}/>";