add test

ext/dom/tests/bug35342.phpt

@@ -0,0 +1,17 @@
+--TEST--
+Bug # 35342: isset(DOMNodeList->length) returns false
+--SKIPIF--
+<?php require_once('skipif.php'); ?>
+--FILE--
+<?php
+$dom = new DOMDocument();
+$dom->loadXML("<root><foo>foobar</foo><foo>foobar#2</foo></root>");
+
+$nodelist = $dom->getElementsByTagName("foo");
+
+var_dump($nodelist->length, isset($nodelist->length), isset($nodelist->foo));
+?>
+--EXPECT--
+int(2)
+bool(true)
+bool(false)