PHP Problems after Upgrading (production sys) but also on Fresh install (test sys)

[Shop Suey]

For admin it is:

[CODE][zsa/CODE][18-Apr-2023 11:59:40 Europe/Berlin] PHP Warning: Undefined variable $_SESSION in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php on line 84
[18-Apr-2023 11:59:40 Europe/Berlin] PHP Warning: Trying to access array offset on value of type null in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php on line 84
[18-Apr-2023 11:59:40 Europe/Berlin] PHP Fatal error: Uncaught Error: Call to undefined function error_log() in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php:89
Stack trace:
#0 [internal function]: zen_debug_error_handler()
#1 /home/users/roller/www/usa-158a/sHell-ziM-stIll/includes/init_includes/init_cache_key_check.php(14): file_exists()
#2 /home/users/roller/www/usa-158a/includes/autoload_func.php(40): require_once('...')
#3 /home/users/roller/www/usa-158a/sHell-ziM-stIll/includes/application_top.php(42): require('...')
#4 /home/users/roller/www/usa-158a/sHell-ziM-stIll/home.php(9): require('...')
#5 /home/users/roller/www/usa-158a/sHell-ziM-stIll/index.php(11): require('...')
#6 {main}
thrown in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php on line 89
[18-Apr-2023 11:59:40 Europe/Berlin] PHP Fatal error: Uncaught Error: Call to undefined function error_log() in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php:102
Stack trace:
#0 [internal function]: zen_fatal_error_handler()
#1 {main}
thrown in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php on line 102

For Frontend it is:

[19-Apr-2023 07:42:46 Europe/Berlin] PHP Warning: Undefined variable $_SESSION in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php on line 84
[19-Apr-2023 07:42:46 Europe/Berlin] PHP Warning: Trying to access array offset on value of type null in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php on line 84
[19-Apr-2023 07:42:46 Europe/Berlin] PHP Fatal error: Uncaught Error: Call to undefined function error_log() in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php:89
Stack trace:
#0 [internal function]: zen_debug_error_handler()
#1 /home/users/roller/www/usa-158a/includes/functions/sessions.php(164): session_save_path()
#2 /home/users/roller/www/usa-158a/includes/init_includes/init_sessions.php(29): zen_session_save_path()
#3 /home/users/roller/www/usa-158a/includes/autoload_func.php(40): require_once('...')
#4 /home/users/roller/www/usa-158a/includes/application_top.php(237): require('...')
#5 /home/users/roller/www/usa-158a/index.php(25): require('...')
#6 {main}
thrown in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php on line 89
[19-Apr-2023 07:42:46 Europe/Berlin] PHP Fatal error: Uncaught Error: Call to undefined function error_log() in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php:102
Stack trace:
#0 [internal function]: zen_fatal_error_handler()
#1 {main}
thrown in /home/users/roller/www/usa-158a/includes/extra_configures/enable_error_logging.php on line 102

[Shop Suey]

Thank you!
That now let start the fresh installation of 1.5.8a perfectly with PHP 8.0.27
I will check whether other functions also do work now e.g. create account.

[Shop Suey]

The critical error at "create account" (Frontend) now is solved.

Some minor problems still remain e.g. at "database backup" (s. previous page for error) or at lowstock. I see the German version has an additional function to show all items at one page. Only there appears the following PHP error:

[20-Apr-2023 09:10:39 Europe/Berlin] Request URI: /admin/stats_products_lowstock.php?page=all&sort=products_name&dir=ASC&cat=, IP address: 2a02:8108:94c0:27a0:8ad4:cedd:7f7d:818d, Language id 43
--> PHP Warning: Undefined array key "mfg" in /admin/stats_products_lowstock.php on line 20.

[20-Apr-2023 09:10:39 Europe/Berlin] Request URI: /admin/stats_products_lowstock.php?page=all&sort=products_name&dir=ASC&cat=, IP address: 2a02:8108:94c0:27a0:8ad4:cedd:7f7d:818d, Language id 43
--> PHP Warning: Undefined array key "status" in /admin/stats_products_lowstock.php on line 21.

[20-Apr-2023 09:10:39 Europe/Berlin] Request URI: /admin/stats_products_lowstock.php?page=all&sort=products_name&dir=ASC&cat=, IP address: 2a02:8108:94c0:27a0:8ad4:cedd:7f7d:818d, Language id 43
--> PHP Warning: Undefined array key "csv" in /admin/stats_products_lowstock.php on line 22.

[20-Apr-2023 09:10:39 Europe/Berlin] Request URI: /admin/stats_products_lowstock.php?page=all&sort=products_name&dir=ASC&cat=, IP address: 2a02:8108:94c0:27a0:8ad4:cedd:7f7d:818d, Language id 43
--> PHP Warning: Undefined variable $replace_dir in /admin/stats_products_lowstock.php on line 149.

[20-Apr-2023 09:10:39 Europe/Berlin] Request URI: /admin/stats_products_lowstock.php?page=all&sort=products_name&dir=ASC&cat=, IP address: 2a02:8108:94c0:27a0:8ad4:cedd:7f7d:818d, Language id 43
--> PHP Warning: Undefined variable $dir_model in /admin/stats_products_lowstock.php on line 162.

[20-Apr-2023 09:10:39 Europe/Berlin] PHP Fatal error: Uncaught TypeError: Unsupported operand types: string * string in /admin/stats_products_lowstock.php:173
Stack trace:
#0 {main}
thrown in /admin/stats_products_lowstock.php on line 173

[20-Apr-2023 09:10:39 Europe/Berlin] Request URI: /admin/stats_products_lowstock.php?page=all&sort=products_name&dir=ASC&cat=, IP address: 2a02:8108:94c0:27a0:8ad4:cedd:7f7d:818d
--> PHP Fatal error: Uncaught TypeError: Unsupported operand types: string * string in /admin/stats_products_lowstock.php:173
Stack trace:
#0 {main}
thrown in /admin/stats_products_lowstock.php on line 173.

[Shop Suey]

The error at "show all" for the low stock function has been fixed by webchills and will be available at the next release.