MFH: Add test for bug#42596

ext/session/tests/bug42596.phpt

@@ -0,0 +1,32 @@
+--TEST--
+Bug #42596 (session.save_path MODE option will not set "write" bit for group or world)
+--SKIPIF--
+<?php include('skipif.inc'); ?>
+--INI--
+session.use_cookies=0
+session.cache_limiter=
+session.use_trans_sid=1
+arg_separator.output="&amp;"
+session.name=PHPSESSID
+session.serialize_handler=php
+session.save_handler=files
+--FILE--
+<?php
+$sessdir = dirname(__FILE__).'/sessions/';
+mkdir($sessdir);
+$save_path = '0;0777;'.$sessdir;
+umask(0);
+session_save_path($save_path);
+session_start();
+echo "hello world\n";
+session_write_close();
+
+foreach (glob($sessdir. "*") as $sessfile) {
+  var_dump(decoct(fileperms($sessfile)));
+  unlink($sessfile);
+}
+rmdir($sessdir);
+--EXPECT--
+hello world
+string(6) "100777"
+