PHP-SimpleXML-AddChild与另一个SimpleXMLElement [英] PHP - SimpleXML - AddChild with another SimpleXMLElement

问题描述

我正在尝试构建一个相当复杂的XML文档.

I'm trying to build a rather complex XML document.

我有一堆重复的XML文档.我以为我会使用多个字符串模板作为这些部分的基础文档，并使用simplexml_load_string创建XML元素的实例.

I have a bunch of sections of the XML document that repeats. I thought I'd use multiple string templates as base document for the sections and create instances of XML elements using simplexml_load_string.

所以我有一个SimpleXMLElement实例作为基础文档

So I have one instance of SimpleXMLElement as the base document

$ root = simplexml_load_string($ template_root);

$root = simplexml_load_string($template_root);

然后我遍历数据库中的某些项目，创建新的SimpleXMLElement，如下所示:

then I loop through some items in my database, create new SimpleXMLElement, something like this:

对于(bla bla bla):

for (bla bla bla):

$ item = simplexml_load_string($ template_item); //处理项目 //尝试将项目添加到根文档中. //卡在这里..不能做$ root-> items-> addChild($ item)

$item = simplexml_load_string($template_item); // do stuff with item // try to add item to the root document..
// Stuck here.. can't do $root->items->addChild($item)

endfor;

我无法调用addChild，因为它只需要标记名称和值.您不能将另一个SimpleXMLElement添加到addChild中.

I can't call addChild because it just expects a tag name and value.. you can't addChild another SimpleXMLElement.

我在这里错过了什么吗? addChild不能将SimpleXMLELement作为参数似乎很愚蠢.

Am I missing something here? seems really dumb that addChild can't take a SimpleXMLELement as a parameter.

还有其他方法可以做到吗? (除了使用其他xml库之外)

Is there any other way to do this? (apart from using a different xml lib)

推荐答案

据我所知，您无法使用SimpleXML，因为addChild不会对元素进行深层复制(必须指定可以通过调用SimpleXMLElement::getName()轻松克服标签名称.

As far as I know, you can't do it with SimpleXML because addChild doesn't make a deep copy of the element (being necessary to specify the tag name can easily be overcome by calling SimpleXMLElement::getName()).

一种解决方案是改为使用DOM:

One solution would be to use DOM instead:

具有此功能:

function sxml_append(SimpleXMLElement $to, SimpleXMLElement $from) {
    $toDom = dom_import_simplexml($to);
    $fromDom = dom_import_simplexml($from);
    $toDom->appendChild($toDom->ownerDocument->importNode($fromDom, true));
}

我们有

<?php
header("Content-type: text/plain");
$sxml = simplexml_load_string("<root></root>");

$n1 = simplexml_load_string("<child>one</child>");
$n2 = simplexml_load_string("<child><k>two</k></child>");

sxml_append($sxml, $n1);
sxml_append($sxml, $n2);

echo $sxml->asXML();

输出

<?xml version="1.0"?>
<root><child>one</child><child><k>two</k></child></root>

另请参阅一些使用递归函数和addChild的用户注释，例如这一个.

See also some user comments that use recursive functions and addChild, e.g. this one.

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