用于检索具有相同值的所有记录的Web服务

define('HOST','*****');
define('USER','*****');
define('PASS','*****');
define('DB','*****');

$con = mysqli_connect(HOST,USER,PASS,DB) or die('Unable to Connect');
if($_SERVER['REQUEST_METHOD']=='GET') {
    $user  = $_GET['user'];
    $sql = "SELECT * FROM sample WHERE user='".$user."'";
    $result = mysqli_query($con,$sql);
    while($row=mysqli_fetch_assoc($result)) {
        $output[]=$row;
    }


print(json_encode($output));
mysqli_close($con);

This is my php code it return only single record which match the value. But i want return all record which match to given value.