zabbix3.4graph时间显示不正确的解决办法

按照官网的指导替换系统的时区文件后，有修改了几处php.ini里的时区配置都没有生效，

最后参考了https://support.zabbix.com/browse/ZBX-7820的内容解决了

The problem is people follow old server setup instructions and edit php.ini, when they should edit
/etc/apache2/conf-available/zabbix.conf

And there is two places where they need to change the time zone php5 and php7 (in /etc/apache2/conf-available/zabbix.conf)
Server setup instructions need to be updated.