problems

[marcza71]

Good morning. Things like that jumped out at me.
Warning: Undefined array key "op" in C:\xampp\htdocs\Expiring-link-generator-master\index.php on line 22

Warning: scandir(http://localhost/Expiring-link-generator-master/logs_counters/): Failed to open directory: not implemented in C:\xampp\htdocs\Expiring-link-generator-master\functions.php on line 104

Warning: scandir(): (errno 2): No such file or directory in C:\xampp\htdocs\Expiring-link-generator-master\functions.php on line 104

Fatal error: Uncaught TypeError: array_diff(): Argument #1 ($array) must be of type array, bool given in C:\xampp\htdocs\Expiring-link-generator-master\functions.php:104 Stack trace: #0 C:\xampp\htdocs\Expiring-link-generator-master\functions.php(104): array_diff(false, Array) #1 C:\xampp\htdocs\Expiring-link-generator-master\index.php(25): print_stats_counters() #2 {main} thrown in C:\xampp\htdocs\Expiring-link-generator-master\functions.php on line 104
You'll do something about it.
Greetings, Marek