有效地排序多维数组

Question

这是我的数组的内容:

array(
  'June 01, 2014' => array(
    (int) 722107 => array(
        'date' => 'June 01, 2014',
        'start_time' => '2:00 AM',
        'end_time' => '03:00 AM'
    ),
    (int) 117646 => array(
        'date' => 'June 01, 2014',
        'start_time' => '12:30 AM',
        'end_time' => '03:30 AM'
    )
  ),
  'May 31, 2014' => array(
    (int) 769349 => array(
        'date' => 'May 31, 2014',
        'start_time' => '12:30 AM',
        'end_time' => '03:30 AM'
    )
  )
)

我想要的输出是它应该首先按键排序(ASC中的日期),然后再按ASC中的开始时间排序每个键的值.

根据上面的例子,它应该输出:

array(
     'May 31, 2014' => array(
    (int) 769349 => array(
        'date' => 'May 31, 2014',
        'start_time' => '12:30 AM',
        'end_time' => '03:30 AM'
    )
 ),
'June 01, 2014' => array(

    (int) 117646 => array(
        'date' => 'June 01, 2014',
        'start_time' => '12:30 AM',
        'end_time' => '03:30 AM'
    ),
    (int) 722107 => array(
        'date' => 'June 01, 2014',
        'start_time' => '2:00 AM',
        'end_time' => '03:00 AM'
    )
   )

    )

Answer 1

这两个过程可以使用uksort()和uasort()使用自定义函数来比较两个日期:

function timeCompare($a, $b)
{
    $va = strtotime($a);
    $vb = strtotime($b);

    if ($va != $vb) {
        return $va < $vb ? -1 : 1;
    }
    return 0;
}

// first pass (sort outer elements)
uksort($data, 'timeCompare');
// second pass (sort inner elements)
foreach ($data as &$item) {
    uasort($item, function($a, $b) {
        return timeCompare($a['start_time'], $b['start_time']);
    });
}

演示