Fix spaces in mysql rows

fixSpaces.php

<?php

$host = '127.0.0.1';
$db   = 'dbname';
$user = 'username';
$pass = 'password';
$charset = 'utf8';

$dsn = "mysql:host=$host;dbname=$db;charset=$charset";
$opt = [
    PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
    PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
    PDO::ATTR_EMULATE_PREPARES   => false,
];
$pdo = new PDO($dsn, $user, $pass, $opt);


$stmt = $pdo->query("SELECT id, username, username_canonical,  email, email_canonical 
FROM User WHERE username LIKE '% %'");

$updStatement = $pdo->prepare(
    "UPDATE User set username=?,  username_canonical =?,  email = ?, email_canonical = ? WHERE id=?");
foreach ($stmt as $row)
{
    foreach($row as $key => $v) {
        if ($key ==='id') {
            continue;
        }
        $n = mb_substr($v, -1, 1, 'utf-8');

        $r = preg_replace('/(^\s+)|(\s+$)/u', "", $v);

        printf("%s UPD:  '%s' -> '%s' %s %d\n", $key, $v, $r, $n, ord($n));
        $row[$key] = $r;
    }

    $updStatement->execute([
        $row['username'],
        $row['username_canonical'],
        $row['email'],
        $row['email_canonical'],
        $row['id']
    ]);
    print $updStatement->rowCount() . " rows updated\n";

}