任何人都可以指导我使用json与PHP并通过一个例子在Android中获取输出？

Here I have Php code :

这里我有Php代码:

<?php

mysql_connect("localhost", "root", "") or die("Cannot Connect to Server");
mysql_select_db("info") or die("Cannot Connect to Database");

$sql = "Select * from personal_info where Id=1 ";
$res = mysql_query($sql);
$no = mysql_num_rows($res);

if($no != 0){   
    print(json_encode($res));
}
else
{   
?>

    <script language="javascript">alert("False output");</script>

<?php
}

mysql_close();
?>
<?php

my