Hide Button with Multiple If statements

In essence I want to hide a button if Field "Product" Does Not match any one of 8 preset values.
In effect a series of If tests.
Could some kind person advise how this should be done. Below is extract from PHP Manual in which I have altered the If statement to illustrate what I am trying to achieve.
2. Now in the List page: AfterRecordProcessed event add the

following code:
if (($data['Product']!='Calls Only') Or ($data['Product']!='Line Rental']).....etc.........
$record["MyButton"]=true;

This code will only display button if value of field exported equals 1.