<?php

$con = mysql_connect("localhost","Thh","920920thh");

if (!$con)

  {

  die('Could not connect: ' . mysql_error());

  }

mysql_select_db("my_db", $con);

$result = mysql_query("SELECT * FROM Persons WHERE FirstName = " . "'" . $_POST[firstname] . "'");

$arr=array();

while($row = mysql_fetch_array($result,MYSQL_ASSOC))

  {

      //echo $row['FirstName'] . " " . $row['LastName'] . " " . $row['Age'];

      //echo "<br />";

    $arr[]=$row;

  }

echo json_encode($arr);

mysql_close($con);

?>

[{"id":"43","firstName":"\u8c2d","lastName":"\u72d7\u72d7","age":"18"},{"id":"44","firstName":"\u8c2d","lastName":"\u55e8","age":"66"}]