Add notice

Author: TysonAndre

ext/spl/spl_util.h

@@ -1,3 +1,19 @@
+/*
+  +----------------------------------------------------------------------+
+  | Copyright (c) The PHP Group                                          |
+  +----------------------------------------------------------------------+
+  | This source file is subject to version 3.01 of the PHP license,      |
+  | that is bundled with this package in the file LICENSE, and is        |
+  | available through the world-wide-web at the following url:           |
+  | https://www.php.net/license/3_01.txt                                 |
+  | If you did not receive a copy of the PHP license and are unable to   |
+  | obtain it through the world-wide-web, please send a note to          |
+  | license@php.net so we can mail you a copy immediately.               |
+  +----------------------------------------------------------------------+
+  | Author: Antony Dovgal <tony@daylessday.org>                          |
+  |         Etienne Kneuss <colder@php.net>                              |
+  +----------------------------------------------------------------------+
+*/
 #ifndef SPL_UTIL
 #define SPL_UTIL