使用PHP合并和附加XML文档

Question

I would like to merge two XML documents. They are from two distinct web services. Each XML documents states how many books it holds in the node. I would like the total of (from each XML document) to be added and appended to the resulting merged XML document.

PHP code merging the documents:

<?php
header('Content-type:  text/xml');

$xmlDom1 = new DOMDocument();
$xmlString = '';
foreach ( file('1.xml') as $node ) {
$xmlString .= trim($node);
}
$xmlDom1->loadXML($xmlString);


$xmlDom2 = new DOMDocument();
$xmlString = '';
foreach ( file('2.xml') as $node ) {
$xmlString .= trim($node);
}
$xmlDom2->loadXML($xmlString);



//merge doms
$xmlRoot = $xmlDom1->documentElement;
foreach ( $xmlDom2->documentElement->childNodes as $node2 ) {
 $node = $xmlDom1->importNode($node2,true);
 $xmlRoot->appendChild($node);

} echo $xmlDom1->saveXML();?>

First XML document:

<?xml version="1.0"?>
<catalog>
<NumberOfResult>2</NumberOfResult>
<book>
  <bookid>1</bookid>
  <author>Gambardella, Matthew</author>
  <title>XML Developer's Guide</title>
  <genre>Computer</genre>
  <price>44.95</price>
  <publish_date>2000-10-01</publish_date>
  <description>An in-depth look at creating applications 
  with XML.</description>
   </book>
  <book>
<bookid>2</bookid>
  <author>Ralls, Kim</author>
  <title>Midnight Rain</title>
  <genre>Fantasy</genre>
  <price>5.95</price>
  <publish_date>2000-12-16</publish_date>
  <description>A former architect battles corporate zombies, 
  an evil sorceress, and her own childhood to become queen 
  of the world.</description>
 </book>
</catalog>

Second XML document:

   <?xml version="1.0"?>
<catalog>
<NumberOfResult>1</NumberOfResult>
<book>
<bookid>3</bookid>
  <author>Galos, Mike</author>
  <title>Visual Studio 7: A Comprehensive Guide</title>
  <genre>Computer</genre>
  <price>49.95</price>
  <publish_date>2001-04-16</publish_date>
  <description>Microsoft Visual Studio 7 is explored in depth,
  looking at how Visual Basic, Visual C++, C#, and ASP+ are 
  integrated into a comprehensive development 
  environment.</description>
</book>
</catalog>

Answer 1

Save the content of your XML documents into variables, e.g. $xmlDocument1, 2, 3...

Use str_replace (http://www.php.net/manual/de/function.str-replace.php) and delete from the first document.

$output_new = str_replace("</catalog>", "", $xmlDocument1);

Then use it for each (use for each!) to remove it from every further document (or just the second one):

$output_new = $output_new . str_replace("<catalog>", "", $xmlDocument[$i]);
$output_new = $output_new . str_replace("</catalog>", "", $xmlDocument[$i]);

$i is the value you set in your for each which shall increase +1 every loop.

At the end, add :

$output_new = $output_new . '</catalog>';

And last but not least, write it to a new .xml file:

$xmlDocument_new = fopen("merged.xml","w");
fwrite($xmlDocument_new, $output_new);

You can also shorten the upper str_replace (in the loop) with an array but I think this is better visualized for you. Give it a try. Good luck!