如何使用比DOM更深层的PHP DOM向XML添加新元素？ [英] How do I add new elements to XML using PHP DOM deeper than the root?

问题描述

我可以在网上找到的所有这些例子都是简单地将内容添加到文档根目录下的XML文件，但我真的需要比这更深入。

我的XML文件很简单，我有：

 <？xml v1等> 
< channel> 
<截图> 
< item> 
< title>图像标题< / title> 
< link> www.link.com/image.jpg< / link> 
< / item> 
< / screenshots> 
< / channel>所有我想要做的就是添加新的item元素，每个元素都有一个标题，并且链接。我知道我需要使用PHP DOM，但是对于如何编写代码，我很遗憾，因为它在截图中添加数据，而不是覆盖整个文档。我有怀疑我可能需要使用XPath，但我不知道如何！
 
 
 
我从在线示例拼接在一起的代码看起来像这样（但我'确定是错误的）
  $ newshottitle =我的新截图; 
 $ newshotlink =http://www.image.com/image.jpg; 
 
 $ dom = newDomDocument; 
 $ dom-> formatOutput = true; 
 $ dom-> load（../ xml / screenshots.xml）; 
 
 $ dom-> getElementsByTagName（screenshots）; 
 $ t = $ dom-> createElement（item）; 
 $ t = $ dom-> createElement（title）; 
 $ t-> appendChild（$ dom-> createTextNode（$ newshottitle））; 
 
 $ l = $ dom-> createElement（link）; 
 $ 1> appendChild（$ dom-> createTextNode（$ newshotlink））; 
 
 $ dom-> save（../ xml / screenshots.xml）; 
  
 
 
解决方案
 
 
 
将内容添加到文件根目录下的XML文件，但我真的需要做的比这更深刻。
 
 
你不会在任何地方添加内容时刻！您创建带有文本的< title>和< link>元素节点，那么您对它们什么都不做。您应该将它们传递到< item>元素节点上的'appendChild'（您也正在创建它并立即将其分配给变量）。
 
 
 
这是一个起点：
  $ screenshots = $ dom-> getElementsByTagName（screenshots）[0]; 
 
 $ title = $ dom-> createElement（title）; 
 $ title-> appendChild（$ dom-> createTextNode（$ newshottitle））; 
 $ item = $ dom-> createElement（item）; 
 $ item-> appendChild（$ title）; 
 $ screenshots-> appendChild（$ item）; 
  
 
All of the examples I can find online about this involve simply adding content to an XML file at the document root, but I really need to do it deeper than that.

My XML file is simple, I have:
<?xml v1 etc>
<channel>
<screenshots>
<item>
  <title>Image Title</title>
  <link>www.link.com/image.jpg</link>
</item>
</screenshots>
</channel>
All I want to be able to do is add new "item" elements, each with a title and link. I know I need to be using PHP DOM, but I'm stumped as to how to code it so that it adds data within "screenshots" rather than overwriting the whole document. I have a suspicion I may need to use XPath too, but I have no idea how!

The code I have pieced together from online examples looks like this (but I'm certain it's wrong)
$newshottitle = "My new screenshot";
$newshotlink = "http://www.image.com/image.jpg";

$dom = newDomDocument;
$dom->formatOutput = true;
$dom->load("../xml/screenshots.xml");

$dom->getElementsByTagName("screenshots");
$t = $dom->createElement("item");
$t = $dom->createElement("title");
$t->appendChild($dom->createTextNode("$newshottitle"));

$l = $dom->createElement("link");
$l->appendChild($dom->createTextNode("$newshotlink"));

$dom->save("../xml/screenshots.xml");

解决方案

  
adding content to an XML file at the document root, but I really need to do it deeper than that.
You're not adding content anywhere at the moment! You create <title> and <link> element nodes with text in, then you do nothing with them. You should be passing them into ‘appendChild’ on the <item> element node (which also you are currently creating and immediately throwing away by not assigning it to a variable).

Here's a starting-point:
$screenshots= $dom->getElementsByTagName("screenshots")[0];

$title= $dom->createElement("title");
$title->appendChild($dom->createTextNode($newshottitle));
$item= $dom->createElement("item");
$item->appendChild($title);
$screenshots->appendChild($item);


                        
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