Stuck finding correct driver

The following warnings occurred:

Warning [2] Use of undefined constant SAPI_NAME - assumed 'SAPI_NAME' (this will throw an Error in a future version of PHP) - Line: 3175 - File: inc/functions.php PHP 7.2.13-1+ubuntu16.04.1+deb.sury.org+1 (Linux)

File	Line	Function
/inc/functions.php	3175	errorHandler->error
/showthread.php	99	build_archive_link

Warning [2] Use of undefined constant IN_ARCHIVE - assumed 'IN_ARCHIVE' (this will throw an Error in a future version of PHP) - Line: 3118 - File: inc/functions.php PHP 7.2.13-1+ubuntu16.04.1+deb.sury.org+1 (Linux)

File	Line	Function
/inc/functions.php	3118	errorHandler->error
/inc/functions.php	3111	build_forum_breadcrumb
/showthread.php	155	build_forum_breadcrumb

File	Line	Function
/inc/functions.php	3118	errorHandler->error
/showthread.php	155	build_forum_breadcrumb

Warning [2] count(): Parameter must be an array or an object that implements Countable - Line: 757 - File: showthread.php PHP 7.2.13-1+ubuntu16.04.1+deb.sury.org+1 (Linux)

File	Line	Function
/showthread.php	757	errorHandler->error

Warning [2] preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead - Line: 342 - File: inc/class_parser.php PHP 7.2.13-1+ubuntu16.04.1+deb.sury.org+1 (Linux)

File	Line	Function
[PHP]		errorHandler->error
/inc/class_parser.php	342	preg_replace
/inc/class_parser.php	152	postParser->parse_mycode
/inc/functions_post.php	570	postParser->parse_message
/showthread.php	766	build_postbit

Warning [2] preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead - Line: 368 - File: inc/class_parser.php PHP 7.2.13-1+ubuntu16.04.1+deb.sury.org+1 (Linux)

File	Line	Function
[PHP]		errorHandler->error
/inc/class_parser.php	368	preg_replace
/inc/class_parser.php	152	postParser->parse_mycode
/inc/functions_post.php	570	postParser->parse_message
/showthread.php	766	build_postbit

Warning [2] preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead - Line: 369 - File: inc/class_parser.php PHP 7.2.13-1+ubuntu16.04.1+deb.sury.org+1 (Linux)

File	Line	Function
[PHP]		errorHandler->error
/inc/class_parser.php	369	preg_replace
/inc/class_parser.php	152	postParser->parse_mycode
/inc/functions_post.php	570	postParser->parse_message
/showthread.php	766	build_postbit

Warning [2] preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead - Line: 370 - File: inc/class_parser.php PHP 7.2.13-1+ubuntu16.04.1+deb.sury.org+1 (Linux)

File	Line	Function
[PHP]		errorHandler->error
/inc/class_parser.php	370	preg_replace
/inc/class_parser.php	152	postParser->parse_mycode
/inc/functions_post.php	570	postParser->parse_message
/showthread.php	766	build_postbit

Warning [2] preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead - Line: 371 - File: inc/class_parser.php PHP 7.2.13-1+ubuntu16.04.1+deb.sury.org+1 (Linux)

File	Line	Function
[PHP]		errorHandler->error
/inc/class_parser.php	371	preg_replace
/inc/class_parser.php	152	postParser->parse_mycode
/inc/functions_post.php	570	postParser->parse_message
/showthread.php	766	build_postbit

Warning [2] preg_replace(): The /e modifier is no longer supported, use preg_replace_callback instead - Line: 377 - File: inc/class_parser.php PHP 7.2.13-1+ubuntu16.04.1+deb.sury.org+1 (Linux)

File	Line	Function
[PHP]		errorHandler->error
/inc/class_parser.php	377	preg_replace
/inc/class_parser.php	152	postParser->parse_mycode
/inc/functions_post.php	570	postParser->parse_message
/showthread.php	766	build_postbit