Question

Hello stackoverflow社区。我需要有关数组的帮助。这是我的弱点。我有这种阵列：

vagrant ssh

我的工作是随机化具有相同Array ( [0] => Array ( [id] => 7 [slot] => 1 [name] => Apple [start_date] => 12/16/2015 [end_date] => 03/10/2016 [status] => 1 [pre_exp_email] => 0 ) [1] => Array ( [id] => 8 [slot] => 1 [name] => Cherry [start_date] => 12/29/2015 [end_date] => 03/20/2016 [status] => 1 [pre_exp_email] => 0 ) [2] => Array ( [id] => 5 [slot] => 3 [name] => Bananna [start_date] => 11/30/2015 [end_date] => 00/00/0000 [status] => 1 [pre_exp_email] => 0 ) [3] => Array ( [id] => 1 [slot] => 4 [name] => Kiwi [start_date] => 11/21/2015 [end_date] => 12/21/2016 [status] => 1 [pre_exp_email] => 0 ) )的元素，但保持顺序升序。例如现在是：

[slot]

我需要随机化那些具有相同插槽号的元素。所以Apple和Cherry将交换头寸。我怎么能这样做呢？

Answer 1

更新：使用shuffle＆amp;我们：

shuffle($fruits); 
function cmp($a, $b) {
  if ($a['slot'] == $b['slot']) {
    return 0;
  }
  return ($a['slot'] < $b['slot']) ? -1 : 1;
}

usort($fruits, "cmp");

Answer 2

使用slot作为键

从原始阵列创建一个新阵列

$elements = array(
    0 => Array
        (
            'id' => 7,
            'slot' => 1
        ),

    1 => Array
        (
            'id' => 8,
            'slot' => 1
        ),

    2 => Array
        (
            'id' => 9,
            'slot' => 1
        ),
    3 => Array
        (
            'id' => 9,
            'slot' => 5
        )
);

foreach($elements as $element){
    $newArray[$element['slot']][] = $element; //put every element having the same slot
}
$elementSlots = array_keys($newArray); // all slots are stored in elementSlots
$Result = array();
foreach($elementSlots as $slot) {
    shuffle($newArray[$slot]); //randomize elements having the same slot
    foreach($newArray[$slot] as $element) { //add them to the result array
        $Result[$slot][] = $element;//For output 1
        //$Result[] = $element; //For output 2
    }
}
var_dump($Result);

输出1：

array (size=2)
  1 => 
    array (size=3)
      0 => 
        array (size=2)
          'id' => int 7
          'slot' => int 1
      1 => 
        array (size=2)
          'id' => int 9
          'slot' => int 1
      2 => 
        array (size=2)
          'id' => int 8
          'slot' => int 1
  5 => 
    array (size=1)
      0 => 
        array (size=2)
          'id' => int 9
          'slot' => int 5

输出2：

array (size=4)
  0 => 
    array (size=2)
      'id' => int 7
      'slot' => int 1
  1 => 
    array (size=2)
      'id' => int 9
      'slot' => int 1
  2 => 
    array (size=2)
      'id' => int 8
      'slot' => int 1
  3 => 
    array (size=2)
      'id' => int 9
      'slot' => int 5

随机化具有相同值的元素

2 个答案: