add extra test to protected behavior of compact and array string key order

ext/standard/tests/array/compact_order.phpt

@@ -0,0 +1,25 @@
+--TEST--
+compact() and hashmap order
+--FILE--
+<?php
+
+$foo = null;
+$bar = null;
+
+var_dump(compact('foo', 'bar'));
+var_dump(compact('bar', 'foo'));
+
+?>
+--EXPECT--
+array(2) {
+  ["foo"]=>
+  NULL
+  ["bar"]=>
+  NULL
+}
+array(2) {
+  ["bar"]=>
+  NULL
+  ["foo"]=>
+  NULL
+}