Converted example to use PDO.

gist.php

<?php

$dsn = 'mysql:host=trolololol;dbname=WOOT!';
$username = 'yeah';
$password = 'MMMMM hmm';

$pdo = new PDO($dsn, $username, $password);

$sql = 'SELECT `date`, SUM(`Commited`) AS committedSum FROM StorageUsedByVm GROUP BY `date`';
$stmt = $pdo->query($sql);

$data = $stmt->fetchAll();