Code not working properly.

[jamessmith1st]

Fatal error: Uncaught TypeError: implode(): Argument #2 ($array) must be of type ?array, string given in C:\xampp\htdocs\vipul\imtermediate1.php:25 Stack trace: #0 C:\xampp\htdocs\vipul\imtermediate1.php(25): implode(Array, '-') #1 {main} thrown in C:\xampp\htdocs\vipul\imtermediate1.php on line 25

when you try selecting the bank from dropdown menu or selecting from the bank's list given below.. the same error occurs.

Please solve this out if possible.

I'm learning php and mysql bt unable to find such error anywhere.

thanks