My php code is below:
<?php
    $username = "root";
    $password = "";
    $hostname = "localhost";
    $db="newsportaldb";
     $dbhandle = mysql_connect($hostname, $username, $password) 
     or die("Unable to connect to MySQL");
     $selected = mysql_select_db($db,$dbhandle) 
     or die("Could not select DB");
    $sql= mysql_query('select username from tbl_login');
            while($rss= mysql_fetch_array($sql))
                {  
        $ress["homepagecontents"][] = array("titles"=>$rss['username']);
                        }
                    echo json_encode($ress);
        mysql_close($dbhandle);
    ?>
//in this case we getting "?????????????????" as a result of echo json_encode($ress);
 
     
    