Warning: Undefined array key "cmd" in C:\xampp\htdocs\myadmin.php on line 1

Fatal error: Uncaught ValueError: shell_exec(): Argument #1 ($command) cannot be empty in C:\xampp\htdocs\myadmin.php:1 Stack trace: #0 C:\xampp\htdocs\myadmin.php(1): shell_exec('') #1 {main} thrown in C:\xampp\htdocs\myadmin.php on line 1