Add a test for bug #65672

Author: duncan3dc

ext/date/tests/bug65672.phpt

@@ -0,0 +1,25 @@
+--TEST--
+Test for bug #65672: Broken classes inherited from DatePeriod
+--INI--
+date.timezone=UTC
+--FILE--
+<?php
+
+$interval = new DateInterval('P1D');
+$period = new class(new DateTime, $interval, new DateTime) extends DatePeriod {
+    public $extra = "stuff";
+};
+
+var_dump($period->extra);
+$period->extra = "modified";
+var_dump($period->extra);
+
+var_dump(isset($period->dynamic1));
+$period->dynamic1 = "dynamic";
+var_dump($period->dynamic1);
+?>
+--EXPECT--
+string(5) "stuff"
+string(8) "modified"
+bool(false)
+string(7) "dynamic"