Add regression test for bug #68175

NEWS

@@ -29,6 +29,10 @@ PHP                                                                        NEWS
   . Fixed bug #76595 (phpdbg man page contains outdated information).
     (Kevin Abel)
 
+- SPL:
+  . Fixed bug #68175 (RegexIterator pregFlags are NULL instead of 0). (Tim
+    Siebels)
+
 - zlib:
   . Fixed bug #65988 (Zlib version check fails when an include/zlib/ style dir
     is passed to the --with-zlib configure option). (Jay Bonci)

ext/spl/tests/bug68175.phpt

@@ -0,0 +1,18 @@
+--TEST--
+Bug #68175 (RegexIterator pregFlags are NULL instead of 0)
+--FILE--
+<?php
+$arr = new ArrayIterator(array());
+$regex = new RegexIterator($arr, '/^test/');
+var_dump(
+    $regex->getMode(),
+    $regex->getFlags(),
+    $regex->getPregFlags()
+);
+?>
+===DONE===
+--EXPECT--
+int(0)
+int(0)
+int(0)
+===DONE===