JSON encode a MySQL result using PHP

json-encode-mysql.php

<?php

$dbhost = "localhost";
$dbuser = "dbuser";
$dbpass = "dbpass";
$dbname = "dbname";

$conn = new mysqli($dbhost, $dbuser, $dbpass, $dbname);

if ($conn->connect_error) {
    die("Connection failed: " . $conn->connect_error);
} 

$sql = "SELECT * FROM customer";

$return_arr = array();

if ($result = mysqli_query( $conn, $sql )){
    while ($row = mysqli_fetch_assoc($result)) {
    $row_array['id'] = $row['id'];
    $row_array['username'] = $row['username'];
    $row_array['email'] = $row['email'];

    array_push($return_arr,$row_array);
   }
 }


mysqli_close($conn);

echo json_encode($return_arr);

?>