问按日期键重新组织数组

EN

$events = array(
"2016/03/06" => array("Random Data 1","Random Data 2"),
"2016/02/15" => array("Random Data 1","Random Data 2"),
"2016/03/07" => array("Random Data 1","Random Data 2"),
"2015/04/02" => array("Random Data 1","Random Data 2"),
"2015/05/02" => array("Random Data 1","Random Data 2")
);

var_dump($events);
ksort($events);
var_dump($events);

//objectify & reverse
foreach($arr as $key=>$var) {
   $arr2[$var]=new DateTime(substr($key,6,4).'-'.substr($key,0,2).'-'.substr($key,3,2));
}

//sort
asort($arr2);

//re-reverse & format
foreach($arr2 as $key=>$var) {
   $var=date_format($var,'m-d-Y');
   $arr3[$var]=$key;
}

//read
foreach($arr3 as $key=>$var) {
   echo $key.': '.$var;
}

// Define array
$events = array(
    "03/06/2016" => array("Random Data 1","Random Data 2"),
    "02/15/2016" => array("Random Data 1","Random Data 2"),
    "03/07/2016" => array("Random Data 1","Random Data 2")
);

// New array
$sortedEvents = array();

// Change key date format
foreach ($events as $date => $randomDates) {
    $date = DateTime::createFromFormat('m/d/Y', $date);
    $sortedEvents[$date->format('Ymd')] = $randomDates;
}

// Sort new array
ksort($sortedEvents);

// Output array
var_dump($sortedEvents);