think组合查询AND和OR一起用

如下示例：

$_where 和 $where组合查询

$_where之间用OR

$where之间用AND

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$condition = I('post.condition'); switch($condition){     case 1:         $where['t.digest'] = array('gt',0);         break;     case 2:         $where['t.displayorder'] = 4;         break;     case 3:         $where['t.type'] = 1;         break;     default:         $_where['t.type']       = 1;         $_where['t.displayorder']= 4;         $_where['t.digest']     = array('gt',0);         $_where['_logic']       = 'or';         $where['_complex']      = $_where; } // 板块筛选 if($_POST['fid']){     $where['t.fid'] = I('post.fid'); } // 时间筛选 if($_POST['start_time'] and $_POST['end_time']){     $where['t.add_time'] = array(         array('egt',strtotime(I('post.start_time'))),         array('elt',strtotime(I('post.end_time')))     ); }else{     if($_POST['start_time']){         $where['t.add_time'] = array('egt',strtotime(I('post.start_time')));     }else if($_POST['end_time']){         $where['t.add_time'] = array('elt',strtotime(I('post.end_time')));     } }