Zend DB - 在哪里和或者查询

Question

Could someone please tell me the correct syntax for a Zend DB query to represent the last line (the and (xxx or xxx)

...
where
    id = 1241487470
and (contract=0 or is_work IS NOT NULL)
...

I'm stuck at this:

->where('id = ?', 1241487470)
->where(...)

Answer 1

This seemed logical and worked. So Yay.

->where('id = ?', 1241487470)
->where('contract= ? or is_work IS NOT NULL)