i get warining like this:
Warning: Undefined array key 0 in /home/software/php/lib/php/AVT-PHPLib/AVT-Std-ad.php on line 107

Warning: Trying to access array offset on null in /home/software/php/lib/php/AVT-PHPLib/AVT-Std-ad.php on line 107

Warning: Trying to access array offset on null in /home/software/php/lib/php/AVT-PHPLib/AVT-Std-ad.php on line 107
Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /home/software/apache/htdocs/sandbox/PHP8/MitarbeiterLifeCycle/index.php on line 163

Deprecated: explode(): Passing null to parameter #2 ($string) of type string is deprecated in /home/software/apache/htdocs/sandbox/PHP8/***/index.php on line 163

i tried
error_reporting = E_ALL & ~E_WARNING & ~E_NOTICE & ~E_STRICT & ~E_DEPRECATED;
in app.ini.php file but i still get these Warning message