需要帮助批量查找/替换文本文件的一部分

Question

I have a rather unique situation where I need to make mass edits to an XML (or plain text) file. Within the XML file, there are several image references such as this one:

<image>
  <id>image1</id>
  <dateTaken>Sun Sep 9 10:57:31 GMT-0700 2012</dateTaken>
  <dateAdded>Mon Jun 24 17:44:50 GMT-0700 2013</dateAdded>
  <filename>0881DAF2-80EC-7A25-9CF3-BFD67F4EF764.jpg</filename>
</image>

What I need to do is take the file name between <filename> and </filename>, and use that to replace the portion between <id> and </id>. For example in the case above, I would need to replace "image1" with 0881DAF2-80EC-7A25-9CF3-BFD67F4EF764.jpg so it would look like this:

<image>
  <id>0881DAF2-80EC-7A25-9CF3-BFD67F4EF764.jpg</id>
  <dateTaken>Sun Sep 9 10:57:31 GMT-0700 2012</dateTaken>
  <dateAdded>Mon Jun 24 17:44:50 GMT-0700 2013</dateAdded>
  <filename>0881DAF2-80EC-7A25-9CF3-BFD67F4EF764.jpg</filename>
</image>

There are several hundred of these image references I need to change in this same document. Using PHP or another method, is there a quick way I can mass edit the document and replace the every ID between <id> and </id> with the content between <filename> and </filename>, in every <image> </image> reference within the document? Thanks a bunch for any possible help!

Answer 1

Assuming you have a root to this xml, you could do something like the following by loading the xml as $xml_string:

$xml = new SimpleXMLElement($xml_string);
foreach($xml->children() as $child){
$child->id = $child->filename;
}
$xml->asXml('updated.xml');