DOMDocument::xinclude

(PHP 5, PHP 7, PHP 8)

DOMDocument::xinclude — Substitutes XIncludes in a DOMDocument Object

Description

public function DOMDocument::xinclude(int $options = 0): int|false

This method substitutes » XIncludes in a DOMDocument object.

Note:
Due to libxml2 automatically resolving entities, this method will produce unexpected results if the included XML file have an attached DTD.

Warning

Avoid calling this method on untrusted XML, as XIncludes can include files from external websites (when the href attribute is a URL) or arbitrary local files (when the href attribute uses file://).

Parameters

options: Bitwise OR of the libxml option constants.

Return Values

Returns the number of XIncludes in the document, -1 if some processing failed, or false if there were no substitutions.

Examples

Example #1 DOMDocument::xinclude() example

<?php

$xml = <<<EOD
<?xml version="1.0" ?>
<chapter xmlns:xi="http://www.w3.org/2001/XInclude">
 <title>Books of the other guy..</title>
 <para>
  <xi:include href="examples/book.xml">
   <xi:fallback>
    <error>xinclude: book.xml not found</error>
   </xi:fallback>
  </xi:include>
 </para>
</chapter>
EOD;

$dom = new DOMDocument;

// let's have a nice output
$dom->preserveWhiteSpace = false;
$dom->formatOutput = true;

// load the XML string defined above
$dom->loadXML($xml);

// substitute xincludes
$dom->xinclude();

echo $dom->saveXML();

?>

The above example will output something similar to:

<?xml version="1.0"?>
<chapter xmlns:xi="http://www.w3.org/2001/XInclude">
  <title>Books of the other guy..</title>
  <para>
    <row xml:base="/home/didou/book.xml">
       <entry>The Grapes of Wrath</entry>
       <entry>John Steinbeck</entry>
       <entry>en</entry>
       <entry>0140186409</entry>
      </row>
    <row xml:base="/home/didou/book.xml">
       <entry>The Pearl</entry>
       <entry>John Steinbeck</entry>
       <entry>en</entry>
       <entry>014017737X</entry>
      </row>
    <row xml:base="/home/didou/book.xml">
       <entry>Samarcande</entry>
       <entry>Amine Maalouf</entry>
       <entry>fr</entry>
       <entry>2253051209</entry>
      </row>
  </para>
</chapter>