From 62129f31a758e86f62410262bb6096f1b2584363 Mon Sep 17 00:00:00 2001
From: Derick Rethans <github@derickrethans.nl>
Date: Thu, 20 Dec 2012 13:22:18 +0000
Subject: Make DatePeriod support DateTimeImmutable as well.

If the start element is a DateTimeImmutable object, then all returned objects
are also DateTimeImmutable objects. If the start element is a DateTime object,
then all returned objects are DateTime objects.
---
 ext/date/php_date.c                       |  4 ++-
 ext/date/php_date.h                       |  1 +
 ext/date/tests/date_period-immutable.phpt | 56 +++++++++++++++++++++++++++++++
 3 files changed, 60 insertions(+), 1 deletion(-)
 create mode 100644 ext/date/tests/date_period-immutable.phpt

diff --git a/ext/date/php_date.c b/ext/date/php_date.c
index fc281ce086..cc83130e1c 100644
--- a/ext/date/php_date.c
+++ b/ext/date/php_date.c
@@ -1847,7 +1847,7 @@ static void date_period_it_current_data(zend_object_iterator *iter, zval ***data
 
 	/* Create new object */
 	MAKE_STD_ZVAL(iterator->current);
-	php_date_instantiate(date_ce_date, iterator->current TSRMLS_CC);
+	php_date_instantiate(object->start_ce, iterator->current TSRMLS_CC);
 	newdateobj = (php_date_obj *) zend_object_store_get_object(iterator->current TSRMLS_CC);
 	newdateobj->time = timelib_time_ctor();
 	*newdateobj->time = *it_time;
@@ -4182,6 +4182,7 @@ PHP_METHOD(DatePeriod, __construct)
 		if (dpobj->end) {
 			timelib_update_ts(dpobj->end, NULL);
 		}
+		dpobj->start_ce = date_ce_date;
 	} else {
 		/* init */
 		intobj  = (php_interval_obj *) zend_object_store_get_object(interval TSRMLS_CC);
@@ -4197,6 +4198,7 @@ PHP_METHOD(DatePeriod, __construct)
 			clone->tz_info = dateobj->time->tz_info;
 		}
 		dpobj->start = clone;
+		dpobj->start_ce = Z_OBJCE_P(start);
 
 		/* interval */
 		dpobj->interval = timelib_rel_time_clone(intobj->diff);
diff --git a/ext/date/php_date.h b/ext/date/php_date.h
index 19c692b57f..3af3fa42ed 100644
--- a/ext/date/php_date.h
+++ b/ext/date/php_date.h
@@ -154,6 +154,7 @@ struct _php_interval_obj {
 struct _php_period_obj {
 	zend_object       std;
 	timelib_time     *start;
+	zend_class_entry *start_ce;
 	timelib_time     *current;
 	timelib_time     *end;
 	timelib_rel_time *interval;
diff --git a/ext/date/tests/date_period-immutable.phpt b/ext/date/tests/date_period-immutable.phpt
new file mode 100644
index 0000000000..0ec4b4a130
--- /dev/null
+++ b/ext/date/tests/date_period-immutable.phpt
@@ -0,0 +1,56 @@
+--TEST--
+DatePeriod
+--FILE--
+<?php
+date_default_timezone_set('UTC');
+$db1 = new DateTimeImmutable( '2008-01-01' );
+$db2 = new DateTime( '2008-01-01' );
+$de = new DateTime( '2008-03-31' );
+$di = DateInterval::createFromDateString( 'first day of next month' );
+
+foreach ( new DatePeriod( $db1, $di, $de ) as $dt )
+{
+	echo get_class( $dt ), "\n";
+	echo $dt->format( "l Y-m-d\n" );
+    echo $dt->modify( "3 tuesday" )->format( "l Y-m-d\n" );
+	echo $dt->format( "l Y-m-d\n\n" );
+}
+
+foreach ( new DatePeriod( $db2, $di, $de ) as $dt )
+{
+	echo get_class( $dt ), "\n";
+	echo $dt->format( "l Y-m-d\n" );
+    echo $dt->modify( "3 tuesday" )->format( "l Y-m-d\n" );
+	echo $dt->format( "l Y-m-d\n\n" );
+}
+?>
+--EXPECT--
+DateTimeImmutable
+Tuesday 2008-01-01
+Tuesday 2008-01-15
+Tuesday 2008-01-01
+
+DateTimeImmutable
+Friday 2008-02-01
+Tuesday 2008-02-19
+Friday 2008-02-01
+
+DateTimeImmutable
+Saturday 2008-03-01
+Tuesday 2008-03-18
+Saturday 2008-03-01
+
+DateTime
+Tuesday 2008-01-01
+Tuesday 2008-01-15
+Tuesday 2008-01-15
+
+DateTime
+Friday 2008-02-01
+Tuesday 2008-02-19
+Tuesday 2008-02-19
+
+DateTime
+Saturday 2008-03-01
+Tuesday 2008-03-18
+Tuesday 2008-03-18
-- 
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