PHP7原生语言操作mysql

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链接：$db   = new mysqli("localhost", "root", "mysql", "guanfu_school");
查询：function query($db,$sql,$type=1){
        $result = $db->query($sql);  
        $data=array();
        while ($tmp=mysqli_fetch_assoc($result)) {
            $data[]=$tmp;
        }
        if($type){
                return $data;
        }else{
            return $data[0];
       }
     }
添加：$db->query("insert into ");
更新：$db->query("update  set ");