Reduce memory overhead of DatePeriod via virtual properties

Related to #11644 and #13988

UPGRADING

@@ -1074,6 +1074,9 @@ PHP 8.4 UPGRADE NOTES
     of functions as well as serialization functions such as `json_encode()`,
     `serialize()`.
 
+- Date:
+  . Reduced memory usage of DatePeriod.
+
 - DOM:
   . The performance of DOMNode::C14N() is greatly improved for the case without
     an xpath query. This can give a time improvement of easily two order of

ext/date/php_date.c

@@ -362,6 +362,7 @@ static zval *date_interval_get_property_ptr_ptr(zend_object *object, zend_string
 static zval *date_period_read_property(zend_object *object, zend_string *name, int type, void **cache_slot, zval *rv);
 static zval *date_period_write_property(zend_object *object, zend_string *name, zval *value, void **cache_slot);
 static zval *date_period_get_property_ptr_ptr(zend_object *object, zend_string *name, int type, void **cache_slot);
+static HashTable *date_period_get_debug_info(zend_object *object, int *is_temp);
 
 static int date_object_compare_timezone(zval *tz1, zval *tz2);
 
@@ -1501,45 +1502,6 @@ static void create_date_period_interval(timelib_rel_time *interval, zval *zv)
 	}
 }
 
-static void write_date_period_property(zend_object *obj, const char *name, const size_t name_len, zval *zv)
-{
-	zend_string *property_name = zend_string_init(name, name_len, 0);
-
-	zend_std_write_property(obj, property_name, zv, NULL);
-
-	zval_ptr_dtor(zv);
-	zend_string_release(property_name);
-}
-
-static void initialize_date_period_properties(php_period_obj *period_obj)
-{
-	zval zv;
-
-	/* rebuild properties */
-	zend_std_get_properties_ex(&period_obj->std);
-
-	create_date_period_datetime(period_obj->start, period_obj->start_ce, &zv);
-	write_date_period_property(&period_obj->std, "start", sizeof("start") - 1, &zv);
-
-	create_date_period_datetime(period_obj->current, period_obj->start_ce, &zv);
-	write_date_period_property(&period_obj->std, "current", sizeof("current") - 1, &zv);
-
-	create_date_period_datetime(period_obj->end, period_obj->start_ce, &zv);
-	write_date_period_property(&period_obj->std, "end", sizeof("end") - 1, &zv);
-
-	create_date_period_interval(period_obj->interval, &zv);
-	write_date_period_property(&period_obj->std, "interval", sizeof("interval") - 1, &zv);
-
-	ZVAL_LONG(&zv, (zend_long) period_obj->recurrences);
-	write_date_period_property(&period_obj->std, "recurrences", sizeof("recurrences") - 1, &zv);
-
-	ZVAL_BOOL(&zv, period_obj->include_start_date);
-	write_date_period_property(&period_obj->std, "include_start_date", sizeof("include_start_date") - 1, &zv);
-
-	ZVAL_BOOL(&zv, period_obj->include_end_date);
-	write_date_period_property(&period_obj->std, "include_end_date", sizeof("include_end_date") - 1, &zv);
-}
-
 /* define an overloaded iterator structure */
 typedef struct {
 	zend_object_iterator  intern;
@@ -1659,10 +1621,7 @@ static void date_period_it_move_forward(zend_object_iterator *iter)
 	zend_std_get_properties_ex(&object->std);
 
 	create_date_period_datetime(object->current, object->start_ce, &current_zv);
-	zend_string *property_name = ZSTR_INIT_LITERAL("current", 0);
-	zend_std_write_property(&object->std, property_name, &current_zv, NULL);
 	zval_ptr_dtor(&current_zv);
-	zend_string_release(property_name);
 
 	iterator->current_index++;
 	date_period_it_invalidate_current(iter);
@@ -1835,6 +1794,7 @@ static void date_register_classes(void) /* {{{ */
 	date_object_handlers_period.get_property_ptr_ptr = date_period_get_property_ptr_ptr;
 	date_object_handlers_period.read_property = date_period_read_property;
 	date_object_handlers_period.write_property = date_period_write_property;
+	date_object_handlers_period.get_debug_info = date_period_get_debug_info;
 
 	date_ce_date_error = register_class_DateError(zend_ce_error);
 	date_ce_date_object_error = register_class_DateObjectError(date_ce_date_error);
@@ -5117,8 +5077,6 @@ static bool date_period_init_finish(php_period_obj *dpobj, zend_long options, ze
 
 	dpobj->initialized = 1;
 
-	initialize_date_period_properties(dpobj);
-
 	return true;
 }
 
@@ -5822,8 +5780,6 @@ static bool php_date_period_initialize_from_hash(php_period_obj *period_obj, Has
 
 	period_obj->initialized = 1;
 
-	initialize_date_period_properties(period_obj);
-
 	return 1;
 } /* }}} */
 
@@ -5976,3 +5932,39 @@ static zval *date_period_get_property_ptr_ptr(zend_object *object, zend_string *
 
 	return zend_std_get_property_ptr_ptr(object, name, type, cache_slot);
 }
+
+static HashTable *date_period_get_debug_info(zend_object *object, int *is_temp)
+{
+	HashTable *ht, *props;
+	zval zv;
+	php_period_obj *period_obj;
+
+	period_obj = php_period_obj_from_obj(object);
+	props = zend_std_get_properties(object);
+
+	*is_temp = 1;
+	ht = zend_array_dup(props);
+
+	create_date_period_datetime(period_obj->start, period_obj->start_ce, &zv);
+	zend_hash_str_update(ht, "start", sizeof("start") - 1, &zv);
+
+	create_date_period_datetime(period_obj->current, period_obj->start_ce, &zv);
+	zend_hash_str_update(ht, "current", sizeof("current") - 1, &zv);
+
+	create_date_period_datetime(period_obj->end, period_obj->start_ce, &zv);
+	zend_hash_str_update(ht, "end", sizeof("end")-1, &zv);
+
+	create_date_period_interval(period_obj->interval, &zv);
+	zend_hash_str_update(ht, "interval", sizeof("interval")-1, &zv);
+
+	ZVAL_LONG(&zv, period_obj->recurrences);
+	zend_hash_str_update(ht, "recurrences", sizeof("recurrences")-1, &zv);
+
+	ZVAL_BOOL(&zv, period_obj->include_start_date);
+	zend_hash_str_update(ht, "include_start_date", sizeof("include_start_date")-1, &zv);
+
+	ZVAL_BOOL(&zv, period_obj->include_end_date);
+	zend_hash_str_update(ht, "include_end_date", sizeof("include_end_date")-1, &zv);
+
+	return ht;
+}

ext/date/php_date.stub.php

@@ -673,19 +673,40 @@ class DatePeriod implements IteratorAggregate
     /** @cvalue PHP_DATE_PERIOD_INCLUDE_END_DATE */
     public const int INCLUDE_END_DATE = UNKNOWN;
 
-    /** @readonly */
+    /**
+     * @readonly
+     * @virtual
+     */
     public ?DateTimeInterface $start;
-    /** @readonly */
+    /**
+     * @readonly
+     * @virtual
+     */
     public ?DateTimeInterface $current;
-    /** @readonly */
+    /**
+     * @readonly
+     * @virtual
+     */
     public ?DateTimeInterface $end;
-    /** @readonly */
+    /**
+     * @readonly
+     * @virtual
+     */
     public ?DateInterval $interval;
-    /** @readonly */
+    /**
+     * @readonly
+     * @virtual
+     */
     public int $recurrences;
-    /** @readonly */
+    /**
+     * @readonly
+     * @virtual
+     */
     public bool $include_start_date;
-    /** @readonly */
+    /**
+     * @readonly
+     * @virtual
+     */
     public bool $include_end_date;
 
     public static function createFromISO8601String(string $specification, int $options = 0): static {}