在 Ubuntu 16.04 上安裝 Cacti monitor 模組後，一片空白，檢查 Apache Log 發現有下面的錯誤訊息
# grep error /var/log/apache2/error.log
PHP Fatal error: Uncaught Error: Call to undefined function split() in /usr/share/cacti/site/plugins/monitor/monitor.php:34nStack trace:n#0 {main}n thrown in /usr/share/cacti/site/plugins/monitor/monitor.php on line 33
[@more@]在網路上搜尋了一下，找到
Cacti • View topic – Blank page plugin monitor
How to make Cacti’s Plugin Monitor works on PHP 7
這二篇，似乎是新版本的 PHP 7.x 不支援 split 函數，要改用 explode 函數。
1. 先備份原檔
# mv /usr/share/cacti/site/plugins/monitor/monitor.php /usr/share/cacti/site/plugins/monitor/monitor.php.$(date +%F)
2. 下載修改完成的檔案
# wget https://2blog.ilc.edu.tw/wp-content/uploads/sites/985/25793/25793-3792019.zip -P /usr/share/cacti/site/plugins/monitor
3. 解壓縮
# unzip /usr/share/cacti/site/plugins/monitor/25793-3792019.zip
4. 修改 /usr/share/cacti/site/plugins/monitor/monitor.php 中的設定
# vim /usr/share/cacti/site/plugins/monitor/monitor.php
改成您的設定，共有二行
$link = mysqli_connect(“localhost”, “帳號”, “密碼”, “資料庫名稱”);
5. 重新瀏覽就可以看到畫面了！