i have managed to do this with `addFieldToFilter` default functionality like this:

```
$collection->addFieldToFilter(
    array('first_name','last_name'),
    array($post['firstName'],$post['lastName'])             
);

```

this is working when i print sql (this is just part from the whole statement being printed):

```
((first_name = 'r') OR (last_name = 't'))

```

now i am trying to understand how to use `'like'` instead of `=`.
need some help in understanding that.

your time and answers are highly appericiated thank you.