使用 PHP 将嵌套的 xml 解析为对象

Question

我必须用 PHP 将一个 xml 文件解析为一个对象。目前我不知道如何执行此操作，不胜感激。

xml 很大。我必须解析它的一部分，如下所示：

<someNamespace:xmlDocument>
<someNamespace:categories>
    <category name="Patrick" anAttribute="numericValue" anotherAttribute="numericValue">
        <category name="Andrew" anAttribute="numericValue" anotherAttribute="numericValue">
            <category name="Alice" anAttribute="numericValue" anotherAttribute="numericValue">
                <category name="Thomas" anAttribute="numericValue" anotherAttribute="numericValue">
                    <category name="Michael" anAttribute="numericValue" anotherAttribute="numericValue"/>
                    <category name="Matthew" anAttribute="numericValue" anotherAttribute="numericValue"/>
                </category>
                <category name="Janet" anAttribute="numericValue" anotherAttribute="numericValue">
                    <category name="Steven" anAttribute="numericValue" anotherAttribute="numericValue"/>
                    <category name="Christopher" anAttribute="numericValue" anotherAttribute="numericValue"/>
                </category>
                <category name="Sue" anAttribute="numericValue" anotherAttribute="numericValue"/>
            </category>
            <category name="Charles" anAttribute="numericValue" anotherAttribute="numericValue">
                <category name="John" anAttribute="numericValue" anotherAttribute="numericValue">
                    <category name="Charles" anAttribute="numericValue" anotherAttribute="numericValue"/>
                    <category name="Rosamund" anAttribute="numericValue" anotherAttribute="numericValue"/>
                    <category name="Stuart" anAttribute="numericValue" anotherAttribute="numericValue"/>
                    <category name="Rosamund" anAttribute="numericValue" anotherAttribute="numericValue"/>
                </category>
                <category name="John" anAttribute="numericValue" anotherAttribute="numericValue"/>
            </category>
        </category>
        <category name="Oliver" anAttribute="numericValue" anotherAttribute="numericValue">
            <category name="Jane" anAttribute="numericValue" anotherAttribute="numericValue"/>
            <category name="Lucy" anAttribute="numericValue" anotherAttribute="numericValue">
                <category name="David" anAttribute="numericValue" anotherAttribute="numericValue"/>
                <category name="Robert" anAttribute="numericValue" anotherAttribute="numericValue"/>
                <category name="Hetty" anAttribute="numericValue" anotherAttribute="numericValue">
                    <category name="Kenneth" anAttribute="numericValue" anotherAttribute="numericValue"/>
                    <category name="Jonathan" anAttribute="numericValue" anotherAttribute="numericValue"/>
                </category>
                <category name="Freddy" anAttribute="numericValue" anotherAttribute="numericValue"/>
                <category name="Virginia" anAttribute="numericValue" anotherAttribute="numericValue"/>
            </category>
        </category>
    </category>
</someNamespace:categories>

每个“name”和“anAttribute”属性都是唯一的。

之后我想要的是一个包含许多类别对象的类别对象......

谢谢！

Answer 1

simplexml_load_file

<?php
// The file test.xml contains an XML document with a root element
// and at least an element /[root]/title.

if (file_exists('test.xml')) {
    $xml = simplexml_load_file('test.xml');

    print_r($xml);
} else {
    exit('Failed to open test.xml.');
}
?>

Answer 2

定义 DOMDocument 的扩展

class MyDOMDocument extends DOMDocument
{
    public function toArray(DOMNode $oDomNode = null)
    {
        // return empty array if dom is blank
        if (is_null($oDomNode) && !$this->hasChildNodes()) {
            return array();
        }
        $oDomNode = (is_null($oDomNode)) ? $this->documentElement : $oDomNode;
        if (!$oDomNode->hasChildNodes()) {
            $mResult = $oDomNode->nodeValue;
        } else {
            $mResult = array();
            foreach ($oDomNode->childNodes as $oChildNode) {
                // how many of these child nodes do we have?
                // this will give us a clue as to what the result structure should be
                $oChildNodeList = $oDomNode->getElementsByTagName($oChildNode->nodeName);
                $iChildCount = 0;
                // there are x number of childs in this node that have the same tag name
                // however, we are only interested in the # of siblings with the same tag name
                foreach ($oChildNodeList as $oNode) {
                    if ($oNode->parentNode->isSameNode($oChildNode->parentNode)) {
                        $iChildCount++;
                    }
                }
                $mValue = $this->toArray($oChildNode);
                $sKey   = ($oChildNode->nodeName{0} == '#') ? 0 : $oChildNode->nodeName;
                $mValue = is_array($mValue) ? $mValue[$oChildNode->nodeName] : $mValue;
                // how many of thse child nodes do we have?
                if ($iChildCount > 1) {  // more than 1 child - make numeric array
                    $mResult[$sKey][] = $mValue;
                } else {
                    $mResult[$sKey] = $mValue;
                }
            }
            // if the child is <foo>bar</foo>, the result will be array(bar)
            // make the result just 'bar'
            if (count($mResult) == 1 && isset($mResult[0]) && !is_array($mResult[0])) {
                $mResult = $mResult[0];
            }
        }
        // get our attributes if we have any
        $arAttributes = array();
        if ($oDomNode->hasAttributes()) {
            foreach ($oDomNode->attributes as $sAttrName=>$oAttrNode) {
                // retain namespace prefixes
                $arAttributes["@{$oAttrNode->nodeName}"] = $oAttrNode->nodeValue;
            }
        }
        // check for namespace attribute - Namespaces will not show up in the attributes list
        if ($oDomNode instanceof DOMElement && $oDomNode->getAttribute('xmlns')) {
            $arAttributes["@xmlns"] = $oDomNode->getAttribute('xmlns');
        }
        if (count($arAttributes)) {
            if (!is_array($mResult)) {
                $mResult = (trim($mResult)) ? array($mResult) : array();
            }
            $mResult = array_merge($mResult, $arAttributes);
        }
        $arResult = array($oDomNode->nodeName=>$mResult);
        return $arResult;
    }
}

这样使用

$mydom = new MyDOMDocument();
$mydom->load('test.xml');

print_r($mydom->toArray());