sorting multi dimensional and dynamically created arrays

$feeds = array();

$query = "SELECT * FROM actions WHERE user_id = '$user_id'";
$result = mysql_query($query);

while ($info = mysql_fetch_array($result)) {
$feeds[][$info['date']] = array("feed" => array($info['ID'] =&g开发者_开发技巧t; $user_id));
}


$query = "SELECT * FROM follows WHERE user_id = '$id'";
$result = mysql_query($query);

    while ($info = mysql_fetch_array($result)) {
    $feeds[][$info['date']] = array("follow" => $info['user_id']);
    }

I would like to sort that $feeds array in date format (Y-m-d H:i:s) using [$info['date']] key

How can i do that ?

thanks

EDIT:

example of what i want to see as result is

$feeds = array(
    0 => array(
       '<date>' => array("feed" => array("feed_id" => "user_id"));
    ),
    1 => array(
       '<date>' => array("follow" => "user_id" );
    ),

);

I want to group/sort them in DATE key and do sth depends on if it is FEED or FOLLOW

The best way is to do it in database (faster)!
But if you want do it in PHP, your need uksort (for sorting) + foreach (for grouping) I think