数据记录转为标准的json字符串

/*将查询结果集转为JSON字符串*/function DBToJSONString($jsonItem,$sqlstr){  $data=mssqlquery($sqlstr);  $rows=mssql_num_rows($data);  $fnNums=mssql_num_fields($data);  $SubjectList='';  $SubjArray='';  while ($row=mssql_fetch_array($data)) {     for ($i=0;$i<$fnNums;++$i){ $SubjectList.="\"".mssql_field_name($data,$i)."\":\"".$row[$i]."\",";}     $SubjectList=substr($SubjectList,0,-1);$SubjArray.="{".$SubjectList."},";$SubjectList='';  }  mssql_free_result($data);  $SubjArray="\"".$jsonItem."\":[".substr($SubjArray,0,-1)."]";  return $SubjArray;}