commit 4aa05afeaf22c5bfdce96c6a8faa5ddbfa67c905
Author: Alexander Vladishev <aleksander.vladishev@zabbix.com>
Date:   Thu Jan 28 13:24:45 2021 +0200

    ..F....... [ZBX-18931] removed PHP runtime errors in CLineGraphDraw.php

diff --git a/frontends/php/include/classes/graphdraw/CLineGraphDraw.php b/frontends/php/include/classes/graphdraw/CLineGraphDraw.php
index fc162d6a34..4ed0e3976d 100644
--- a/frontends/php/include/classes/graphdraw/CLineGraphDraw.php
+++ b/frontends/php/include/classes/graphdraw/CLineGraphDraw.php
@@ -1302,7 +1302,7 @@ class CLineGraphDraw extends CGraphDraw {
 	 *
 	 * @return array
 	 */
-	private function getOptimalDateTimeIntervalSpec(int $pref_sub_interval, float $min_sub_interval): array {
+	private function getOptimalDateTimeIntervalSpec($pref_sub_interval, $min_sub_interval) {
 		// Possible X-axis main and sub-intervals.
 		$intervals = [
 			'PT1M' => ['PT1S', 'PT5S', 'PT10S', 'PT30S'],
@@ -1382,7 +1382,7 @@ class CLineGraphDraw extends CGraphDraw {
 	 *
 	 * @return array
 	 */
-	private function getDateTimeIntervals(int $start, int $end, DateInterval $interval): array {
+	private function getDateTimeIntervals($start, $end, $interval) {
 		$intervals = [];
 
 		$interval_ts = (new DateTime('@0'))