- Fixed bug #45696 (Not all DateTime methods allow method chaining).

ext/date/php_date.c

@@ -2992,23 +2992,29 @@ PHP_FUNCTION(date_add)
 	intobj = (php_interval_obj *) zend_object_store_get_object(interval TSRMLS_CC);
 	DATE_CHECK_INITIALIZED(intobj->initialized, DateInterval);
 
-	if (intobj->diff->invert) {
-		bias = -1;
-	}
 
-	dateobj->time->relative.y = intobj->diff->y * bias;
-	dateobj->time->relative.m = intobj->diff->m * bias;
-	dateobj->time->relative.d = intobj->diff->d * bias;
-	dateobj->time->relative.h = intobj->diff->h * bias;
-	dateobj->time->relative.i = intobj->diff->i * bias;
-	dateobj->time->relative.s = intobj->diff->s * bias;
+	if (intobj->diff->have_weekday_relative || intobj->diff->have_special_relative) {
+		memcpy(&dateobj->time->relative, intobj->diff, sizeof(struct timelib_rel_time));
+	} else {
+		if (intobj->diff->invert) {
+			bias = -1;
+		}
+		dateobj->time->relative.y = intobj->diff->y * bias;
+		dateobj->time->relative.m = intobj->diff->m * bias;
+		dateobj->time->relative.d = intobj->diff->d * bias;
+		dateobj->time->relative.h = intobj->diff->h * bias;
+		dateobj->time->relative.i = intobj->diff->i * bias;
+		dateobj->time->relative.s = intobj->diff->s * bias;
+		dateobj->time->relative.weekday = 0;
+		dateobj->time->relative.have_weekday_relative = 0;
+	}
 	dateobj->time->have_relative = 1;
-	dateobj->time->relative.weekday = 0;
-	dateobj->time->relative.have_weekday_relative = 0;
 	dateobj->time->sse_uptodate = 0;
 
 	timelib_update_ts(dateobj->time, NULL);
 	timelib_update_from_sse(dateobj->time);
+
+	RETURN_ZVAL(object, 1, 0);
 }
 /* }}} */
 
@@ -3047,6 +3053,8 @@ PHP_FUNCTION(date_sub)
 
 	timelib_update_ts(dateobj->time, NULL);
 	timelib_update_from_sse(dateobj->time);
+
+	RETURN_ZVAL(object, 1, 0);
 }
 /* }}} */