Error in Database.php

[techtopia-r]

Try to test your code but i got this error

Fatal error: Uncaught Error: Call to undefined function sqlite_open() in \htdocs_dev\pubmail\lib\Database.php:3
Stack trace:
#0 \htdocs_dev\pubmail\lib\functions.php(4): require_once()
#1 \htdocs_dev\pubmail\index.php(5): require_once('\htdocs...')
#2 {main} thrown in \htdocs_dev\pubmail\lib\Database.php on line 3

looks like there is no instance of the sqlite function