Alter all tables of a Database width Engine INNODB

alterEngine.php

<?php
/**
 * Created by Ruben Lacasa Mas
 * User: Ruben Lacasa Mas <ruben@rubenlacasa.es>
 * Date: 18/10/13
 * Time: 12:18
 */
$dbhost    = 'hostname';
$dbname    = 'dbname';
$dbuser    = 'dbuser';
$dbpass    = 'dbpassword';

$dsn = 'mysql:dbname='.$dbname.';host='.$dbhost;
try {
    $dbh = new PDO($dsn, $dbuser, $dbpass);
} catch (PDOException $e) {
    echo 'Connection failed: ' . $e->getMessage();
}
$sql = "SHOW TABLES";
$query = $dbh->prepare($sql);
$query->execute();
$tables = $query->fetchAll(PDO::FETCH_CLASS);
foreach ($tables as $table) {
    $sqlAlter = "ALTER TABLE ".$table->Tables_in_dbname." ENGINE=INNODB;";
    $dbh->exec($sqlAlter);
}