Php MySQL按日期排序（自定义）

Here's my PHP/SQL Request

<?php $events = $wpdb->get_results( 
    "
    SELECT * 
    FROM  `wp_em_events` 
    LIMIT 5
    // HERE'S MY ORDER BY DATE
    "
);

$dt = new DateTime($event->event_start_date);
$formattedDate = $dt->format('d M Y');

foreach ( $events as $event ) 
{

echo '<div class="home-event">';
    echo $formattedDate;
    echo $event->event_name;
echo '</div>';

}

?>

According to a table containaing a column "event_start_date" where values looks like these :

2013-03-27 
2013-04-03
2013-03-31

I want to order my events by those date (the closest to us first)

I tried a single

ORDER BY event_start_date DESC

But it "burn" my request

------- BONUS QUESTION --------

How could I increment my events in order to have :

<div class="home-event-1">
<div class="home-event-2">
<div class="home-event-3">
...

Thank you very much !!

The ORDER BY comes before the LIMIT. You'll want:

SELECT
    * 
FROM
    `wp_em_events` 
ORDER BY
    event_start_date DESC
LIMIT 5

Also, you're fetching the date in the wrong place. It'll need to be within the iteration:

foreach ( $events as $event ) 
{

  $dt = new DateTime($event->event_start_date);

  $formattedDate = $dt->format('d M Y');

  // ...

As for the increments:

foreach ( $events as $key => $event ) 
{

    echo '<div class="home-event-' . ($key + 1) . '">';
    echo $formattedDate;
    echo $event->event_name;
    echo '</div>';

}

Assuming $events is not an associate array, of course. If it is:

$i = 0;

foreach ( $events as $event ) 
{

    echo '<div class="home-event-' . ++$i . '">';
    echo $formattedDate;
    echo $event->event_name;
    echo '</div>';

}