函数内未定义变量，函数内无法连接MySQL $connection

I have a code that works when I use it on a page but Im trying to make this a function. I cant get it to work, it seems like the variables $customer and $system arent being sent through to the code. Even if I type it in Raw. Any idea whats wrong? $Customer is the name of the customer, $system can be 'Source' or 'Target'.I have a code that works when I use it on a pag