php simple mysql conection

<?php

$setting=array("username"=>"root","password"=>"123456","host"=>"127.0.0.1","db"=>"dialer");


$link = mysqli_connect($setting["host"],$setting["username"],$setting["password"],$setting["db"]);

$query= "SELECT * from  audio ";


if ($result = mysqli_query($link, $query)) {
    while ($row = mysqli_fetch_assoc($result)) {


echo "$row[audio_id]\n";

}


}


else {



    printf(" failed: %s\n", mysqli_error($link));

}

/* close connection */
mysqli_close($link);


?>