Fixed memory leaks with DatePeriod::__unserialise

Author: derickr

ext/date/php_date.c

@@ -5077,6 +5077,9 @@ static bool php_date_period_initialize_from_hash(php_period_obj *period_obj, Has
 		if (Z_TYPE_P(ht_entry) == IS_OBJECT && instanceof_function(Z_OBJCE_P(ht_entry), date_ce_interface)) {
 			php_date_obj *date_obj;
 			date_obj = Z_PHPDATE_P(ht_entry);
+			if (period_obj->start != NULL) {
+				timelib_time_dtor(period_obj->start);
+			}
 			period_obj->start = timelib_time_clone(date_obj->time);
 			period_obj->start_ce = Z_OBJCE_P(ht_entry);
 		} else if (Z_TYPE_P(ht_entry) != IS_NULL) {
@@ -5091,6 +5094,9 @@ static bool php_date_period_initialize_from_hash(php_period_obj *period_obj, Has
 		if (Z_TYPE_P(ht_entry) == IS_OBJECT && instanceof_function(Z_OBJCE_P(ht_entry), date_ce_interface)) {
 			php_date_obj *date_obj;
 			date_obj = Z_PHPDATE_P(ht_entry);
+			if (period_obj->end != NULL) {
+				timelib_time_dtor(period_obj->end);
+			}
 			period_obj->end = timelib_time_clone(date_obj->time);
 		} else if (Z_TYPE_P(ht_entry) != IS_NULL) {
 			return 0;
@@ -5104,6 +5110,9 @@ static bool php_date_period_initialize_from_hash(php_period_obj *period_obj, Has
 		if (Z_TYPE_P(ht_entry) == IS_OBJECT && instanceof_function(Z_OBJCE_P(ht_entry), date_ce_interface)) {
 			php_date_obj *date_obj;
 			date_obj = Z_PHPDATE_P(ht_entry);
+			if (period_obj->current != NULL) {
+				timelib_time_dtor(period_obj->current);
+			}
 			period_obj->current = timelib_time_clone(date_obj->time);
 		} else if (Z_TYPE_P(ht_entry) != IS_NULL)  {
 			return 0;
@@ -5117,6 +5126,9 @@ static bool php_date_period_initialize_from_hash(php_period_obj *period_obj, Has
 		if (Z_TYPE_P(ht_entry) == IS_OBJECT && Z_OBJCE_P(ht_entry) == date_ce_interval) {
 			php_interval_obj *interval_obj;
 			interval_obj = Z_PHPINTERVAL_P(ht_entry);
+			if (period_obj->interval != NULL) {
+				timelib_rel_time_dtor(period_obj->interval);
+			}
 			period_obj->interval = timelib_rel_time_clone(interval_obj->diff);
 		} else { /* interval is required */
 			return 0;