如何在关联数组中添加外部数据？

I'm having a problem in adding another data inside a array I really don't know on how to pass it on. Here is my code.

    if($q->num_rows() > 0){
        foreach($q->result() as $rows){
            $data[] = $rows;                
        }
        $data[]['in'] = 'IN';
    }

How can I add IN inside the array. Because it gives me this.

 [0] => stdClass Object
    (
     [rstatus] => Unavailable
        [rprice] => 5000
    )

 [1] => IN
 )

I want it to be like.

 [0] => stdClass Object
    (
     [rstatus] => Unavailable
     [rprice] => 5000
    [in] => IN
    )

You can do this:

if($q->num_rows() > 0){
    foreach($q->result() as $rows) { 
        if (!isset($rows->in)) {           
          $rows->in = 'IN';            
        }
        $data[] = $rows;                
    }
}