$query = CdbForumSellthreadSearch::where($params)->orderBy("$orderby", "$ascDesc")->offset($start)->limit($limit);
$list = CdbForumSellthreadSearch::where($params)->orderBy("$orderby", "$ascDesc")->offset($start)->limit($limit)->get()->toArray();
//打印出的sql是预编译的sql语句,带有问号占位符的sql
print_r($query->toSql());
//下面打印出占位符对应的变量的值,数组里面的顺序和占位符的顺序是一致的
echo '<pre>';
print_r($query->getBindings());
exit;