Thinkphp使用mongodb数据库实现多条件查询方法

case '_complex'://复合查询
             $arr   = array();
             foreach ($val as $nkey=>$nval){
              if( strpos($nkey,'_')!=0)
              {
               $parseArr=$this->parseWhereItem($nkey,$nval);
               //转换成对象
               $obj=new stdClass();
               foreach ($parseArr as $pkey=>$pval)
               {
                $obj->$pkey=$pval;
               }
               array_push($arr, $obj);
              }
             }
             if(isset($val['_logic']) && strtolower($val['_logic']) == 'or' ) {
              unset($val['_logic']);
              $query['$or']   =  $arr;
             }
             break;

foreach ($where as $key=>$val){
            if('_id' != $key && 0===strpos($key,'_')) {
                // 解析特殊条件表达式
                //原 $query=$this->parseThinkWhere($key,$val);
                $query   = array_merge($query,$this->parseThinkWhere($key,$val));
            }else{
                // 查询字段的安全过滤
                if(!preg_match('/^[A-Z_\|\&\-.a-z0-9]+$/',trim($key))){
                    throw_exception(L('_ERROR_QUERY_').':'.$key);
                }
                $key = trim($key);
                if(strpos($key,'|')) {
                    $array   =  explode('|',$key);
                    $str   = array();
                    foreach ($array as $k){
                        $str[]   = $this->parseWhereItem($k,$val);
                    }
                    $query['$or'] =    $str;
                }elseif(strpos($key,'&')){
                    $array   =  explode('&',$key);
                    $str   = array();
                    foreach ($array as $k){
                        $str[]   = $this->parseWhereItem($k,$val);
                    }
                    $query   = array_merge($query,$str);
                }else{
                    $str   = $this->parseWhereItem($key,$val);
                    $query   = array_merge($query,$str);
                }
            }
        }