{set:$where = 1}
{foreach:items=$search}
{if:$item !== ""}{set:$where .= " and ".$key."'".$item."'"}{/if}
{/foreach}
{set:$page= (isset($_GET['page'])&&(intval($_GET['page'])>0))?intval($_GET['page']):1;}
{query: name=bill as b join=left join seller as s on s.id eq b.seller_id left join admin as a on b.admin_id eq a.id where=$where page=$page fields=b.*,s.seller_name,a.admin_name}