Add DOMDocument::xinclude() test for liveness

Author: nielsdos

ext/dom/tests/DOMDocument_getElementsByTagName_liveness_xinclude.phpt

@@ -0,0 +1,43 @@
+--TEST--
+DOMDocument::getElementsByTagName() liveness with DOMDocument::xinclude()
+--EXTENSIONS--
+dom
+--FILE--
+<?php
+
+// Adapted from https://www.php.net/manual/en/domdocument.xinclude.php
+$xml = <<<EOD
+<?xml version="1.0" ?>
+<chapter xmlns:xi="http://www.w3.org/2001/XInclude">
+ <p>Hello</p>
+ <para>
+  <xi:include href="book.xml">
+   <xi:fallback>
+    <p>xinclude: book.xml not found</p>
+   </xi:fallback>
+  </xi:include>
+ </para>
+</chapter>
+EOD;
+
+$dom = new DOMDocument;
+$dom->loadXML($xml);
+$elements = $dom->getElementsByTagName('p');
+var_dump($elements->item(0)->textContent);
+@$dom->xinclude();
+var_dump($elements->item(1)->textContent);
+echo $dom->saveXML();
+
+?>
+--EXPECT--
+string(5) "Hello"
+string(28) "xinclude: book.xml not found"
+<?xml version="1.0"?>
+<chapter xmlns:xi="http://www.w3.org/2001/XInclude">
+ <p>Hello</p>
+ <para>
+  
+    <p>xinclude: book.xml not found</p>
+   
+ </para>
+</chapter>