使用PHP和Dom Document创建复杂的XML结构时遇到了一些问题。
我希望结构如下:
<page PathToWeb="www.mysite.com">
<Questions>
<Question id="my id" member="true">
<Question id="my id2" member="true">
<Question id="my id3" member="true">
</Questions>
</page>
我到目前为止的代码是
<?php
/*Create DOM*/
$xml = new DOMDocument;
$xml->load('myxml.xml'); /* wich is just just blank <?xml?\> <page> </page>*/
$xpath = new DOMXPath($xml);
/*Set the base path*/
$hrefs = $xpath->evaluate("/page");
/*Add Path to web to the root /page*/
$href = $hrefs->item(0);
$href->setAttribute("PathToWeb",$PathToWeb);
/*Complex XML Creation with Xpath*/
/*ELEMENT APPEND (create questions into /page)*/
$href = $hrefs->item(0);
$element = $xml->createElement('Questions');
$href->appendChild($element);
/*XPATH EVALUATE*/
$hrefs = $xpath->evaluate("/page/Questions");
/*ELEMENT 1 APPEND*/
$href = $hrefs->item(0);
$element = $xml->createElement('Question');
$href->appendChild($element);
$hrefs = $xpath->evaluate("/page/Questions/Question");
$href = $hrefs->item(0);
$href->setAttribute("id","my id");
/*ELEMENT 2 APPEND*/
$href = $hrefs->item(0);
$element = $xml->createElement('Question');
$href->appendChild($element);
$hrefs = $xpath->evaluate("/page/Questions/Question");
$href = $hrefs->item(0);
$href->setAttribute("id","my id");
/*ELEMENT 3 APPEND*/
$href = $hrefs->item(0);
$element = $xml->createElement('Question');
$href->appendChild($element);
$hrefs = $xpath->evaluate("/page/Questions/Question");
$href = $hrefs->item(0);
$href->setAttribute("id","my id");
$href = $hrefs->item(0);
$href->setAttribute("member","true");
$string2 = $xml->saveXML();
?>
创造的是:
<page PathToWeb="www.mysite.com">
<Questions><Question id="my id" member="true"><Question/></Question></Questions>
</page>
仅编辑第一个问题...
我该如何解决这个问题?
答案 0 :(得分:6)
您的代码看起来比它需要的更复杂。
因为appendChild
返回附加节点而setAttribute
返回设置的属性节点,所以你也可以创建整个树而不需要任何临时变量,也可以通过链接方法调用和遍历DOM来创建没有任何Xpath的整个树树:
$dom = new DOMDocument('1.0', 'utf-8');
$dom->appendChild($dom->createElement('page'))
->setAttribute('PathToWeb', 'www.mysite.com')
->parentNode
->appendChild($dom->createElement('Questions'))
->appendChild($dom->createElement('Question'))
->setAttribute('id', 'my_id')
->parentNode
->setAttribute('member', 'true')
->parentNode
->parentNode
->appendChild($dom->createElement('Question'))
->setAttribute('id', 'my_id2')
->parentNode
->setAttribute('member', 'true')
->parentNode
->parentNode
->appendChild($dom->createElement('Question'))
->setAttribute('id', 'my_id3')
->parentNode
->setAttribute('member', 'true');
$dom->formatOutput = true;
echo $dom->saveXml();
在想要使用DOM时,了解DOM是DOMNode的树层次结构是必不可少的。有关此问题的解释,请参阅DOMDocument in php。
答案 1 :(得分:1)
$xml = new DOMDocument('1.0','UTF-8');
$root = $xml->createElement('page');
$root->setAttribute("PathToWeb",$PathToWeb);
$wrap = $xml->createElement('Questions');
$root->appendChild($wrap);
for ($i = 1;$i<4;$i++)
{
$element = $xml->createElement('question');
$element->setAttribute("id","my id" . $i);
$element->setAttribute("member","true");
$wrap->appendChild($element);
}
$xml->appendChild($root);
$xml->formatOutput = true;
$xml->save('myxml.xml');// Thanks to Gordon
答案 2 :(得分:0)
<?php
$xml = new DOMDocument;
$xml->load('myxml.xml'); /* wich is just just blank <?xml?> <page> </page>*/
$xpath = new DOMXPath($xml);
/*Set the base path*/
$base = $xpath->evaluate("/page")->item(0);
$base->setAttrubute("PathToWeb", $PathToWeb);
$questions = $xml->createElement('Questions');
$base->appendChild($questions);
for($i = 0; $i < 2; $i++) {
$question= $xml->createElement('Question');
$questions->appendChild($question);
$question->setAttribute("id","my id");
$question->setAttribute("member", "true");
}
$string2 = $xml->saveXML();
?>
答案 3 :(得分:0)
这可以帮助您解决问题并使代码更紧凑,更易于处理:
appendChild
PHP Manual返回新节点。然后,您可以直接使用它。在附加子进程后,无需使用xpath。
如果在将元素节点添加到文档之前添加/设置要设置的属性,则通常甚至不需要:
/*ELEMENT APPEND (create questions into /page)*/
$href = $hrefs->item(0);
$element = $xml->createElement('Questions');
$questions = $href->appendChild($element);
# ^^^
/*ELEMENT 1 APPEND*/
$element = $xml->createElement('Question');
$element->setAttribute("id","my id"); # prepare before adding
$questions->appendChild($element);
...
对于文档的根元素(<page>
),它们完全相同。您不需要使用xpath来访问它并对其进行操作。这是documentElement
PHP Manual:
/*Create DOM*/
$xml = new DOMDocument;
$xml->load('myxml.xml'); /* wich is just just blank <?xml?> <page> </page>*/
/*Add Path to web to the root /page*/
$href = $xml->documentElement;
$href->setAttribute("PathToWeb",$PathToWeb);