Getting values from JSONarray - php

Question

I am writing a PHP script which
connects to the database
fetches all orders in an array. ($result)
I want to go through the array and fetch all say "userName"
The trouble is, with my code below, I am able to only get the first character of each "userName" in the array.I want an array with all "userName"s.
<?php
$dbhost = 'localhost';
$dbuser = 'user';
$dbpass = 'password';
$dbname = 'dbname';
//Create database connection
$dblink = new mysqli($dbhost, $dbuser, $dbpass, $dbname);
$sql = "select * from ordertest";
$retval = mysqli_query($dblink, $sql) or die(mysqli_error($dblink));
$result = mysqli_fetch_array($retval, MYSQLI_ASSOC);
if (mysqli_num_rows($retval) > 0) {
$arr = json_decode($result, true);
foreach ($result as $key => $value) {
echo $value["userName"];
}
} else {
echo $sql;
}

Answer 1

The solution should be next:
<?php
$sql = "select * from ordertest";
// retrieve query result from DB
$retval = mysqli_query($dblink, $sql) or die(mysqli_error($dblink));
// if result not empty
if (mysqli_num_rows($retval) > 0) {
// retrieve single row from $retval
while ($result = mysqli_fetch_array($retval, MYSQLI_ASSOC)) {
echo $result["userName"];
echo "\n";
}
} else {
echo $sql;
}
Look example here: PHPize.online