php - zend based where clause disappearing -

i have weird problem using socialengine db class (based on zend framework). wrote this:

$statustable = engine_api::_()->getdbtable('actions', 'activity'); $myposts = $statustable->fetchall($statustable->select()     ->where('subject_id = ?',$id)     ->where('comment_count > ?',0)     ->where('type = ?',$type)     ->where('date > ?',$newer_than)     ->order('date desc')     ->limit(intval($num_items))); 

its part of plugin made, problem query generated somthing this:

select `engine4_activity_actions`.* `engine4_activity_actions` (subject_id = 5) , (comment_count > 0) , (type = ) , (date > ) order `date` desc limit 10 

you can see $type , $newer_than have disappeared, though have values ($type='status', $newer_than='01/01/2000')

edit: seems respond integers , not strings, if replace 'status' 0 shows in query.

the server runs on php 5.3.2

there's third optionnal argument on where() method type of argument. depending on db adapter can maybe important thing tell zend_db_select query builder. try

->where('subject_id=?',$subject,'text') 

zf api indicates "note more correct use named bindings in queries values other strings", can query builder, real type of args, try way:

$myposts = $statustable->fetchall($statustable->select() ->where('subject_id=:psubject') (...) ,array('psubject'=>$subject));