Backport test of issue #246 to PHP 5

The reference handling issue applied only to PHP 7, nevertheless
run the test against PHP 5 version as well.

tests/issue_246_001.phpt

@@ -0,0 +1,18 @@
+--TEST--
+Test V8::executeString() : Handle Z_TYPE == IS_REFERENCE (issue #246)
+--SKIPIF--
+<?php
+require_once(dirname(__FILE__) . '/skipif.inc');
+?>
+--FILE--
+<?php
+$v8 = new V8Js();
+$array = ['lorem' => 'ipsum'];
+array_walk_recursive($array, function (&$item) {});
+$v8->some_array = $array;
+$v8->executeString('var_dump(PHP.some_array.lorem);');
+?>
+===EOF===
+--EXPECT--
+string(5) "ipsum"
+===EOF===