Added test case for bug #75577

Author: derickr

ext/date/tests/bug75577.phpt

@@ -0,0 +1,22 @@
+--TEST--
+Test for bug #75577: DateTime::createFromFormat does not accept 'v' format specifier
+--INI--
+date.timezone=Europe/London
+--FILE--
+<?php
+$d = new DateTime("2018-10-09 09:56:45.412000");
+var_dump($s = $d->format(DateTime::RFC3339_EXTENDED));
+
+$d2 = DateTime::createFromFormat(DateTime::RFC3339_EXTENDED, $s);
+var_dump($d2);
+?>
+--EXPECTF--
+string(29) "2018-10-09T09:56:45.412+01:00"
+object(DateTime)#%d (3) {
+  ["date"]=>
+  string(26) "2018-10-09 09:56:45.412000"
+  ["timezone_type"]=>
+  int(1)
+  ["timezone"]=>
+  string(6) "+01:00"
+}