$tmp_uids=array_chunk($uids,900);
$diabetes_project=new Tdiabetes_project();
$whereStr='';
foreach ($tmp_uids as $k=>$v){
$whereStr.= " id in ('".implodeFor8("','",$v)."') or";
}
$whereStr=rtrim($whereStr,'or');
$diabetes_project->whereAdd($whereStr);array_chunk可以按length对数组进行拆分。