PHP Random Shuffle Array维护Key => Value

Question

我一直在寻找谷歌的答案,但似乎无法找到一些万无一失的东西,并且不能真正把它弄得一团糟(进入生产网站).

我所拥有的是具有20多个过滤器的高级搜索,它返回包含ID和距离的数组.我需要做的是将这些结果随机播放,以便每次都以随机顺序显示.我现在出来的阵列是:

Array (
    [0] => Array ( [id] => 1 [distance] => 1.95124994507577 )
    [1] => Array ( [id] => 13 [distance] => 4.75358968511882 )
    [2] => Array ( [id] => 7 [distance] => 33.2223233233323 )
    [3] => Array ( [id] => 21 [distance] => 18.2155453552336 )
    [4] => Array ( [id] => 102 [distance] = 221.2212587899658 )
)

我需要做的是每次都随机或按顺序进行,但保持id和距离对,即:

Array (
    [4] => Array ( [id] => 102 [distance] = 221.2212587899658 )
    [1] => Array ( [id] => 13 [distance] => 4.75358968511882 )
    [3] => Array ( [id] => 21 [distance] => 18.2155453552336 )
    [2] => Array ( [id] => 7 [distance] => 33.2223233233323 )
    [0] => Array ( [id] => 1 [distance] => 1.95124994507577 )
)

谢谢 :)

Answer 1

在第一个用户后下shuffle的文件:

在保留键,值对的同时随机关联和非关联数组.还返回混洗数组,而不是将其移动到位.

function shuffle_assoc($list) { 
  if (!is_array($list)) return $list; 

  $keys = array_keys($list); 
  shuffle($keys); 
  $random = array(); 
  foreach ($keys as $key) { 
    $random[$key] = $list[$key]; 
  }
  return $random; 
} 

测试用例:

$arr = array();
$arr[] = array('id' => 5, 'foo' => 'hello');
$arr[] = array('id' => 7, 'foo' => 'byebye');
$arr[] = array('id' => 9, 'foo' => 'foo');
print_r(shuffle_assoc($arr));
print_r(shuffle_assoc($arr));
print_r(shuffle_assoc($arr));

Answer 2

从5.3.0开始,您可以:

uksort($array, function() { return rand() > rand(); });

Answer 3

function shuffle_assoc($array)
{
    $keys = array_keys($array);
    shuffle($keys);
    return array_merge(array_flip($keys), $array);
}

Answer 4

在这里查看这个函数：

     $foo = array('A','B','C'); 

 
function shuffle_with_keys(&$array) {
    /* Auxiliary array to hold the new order */
    $aux = array();
    /* We work with an array of the keys */
    $keys = array_keys($array);
    /* We shuffle the keys */`enter code here`
    shuffle($keys);
    /* We iterate thru' the new order of the keys */
    foreach($keys as $key) {
      /* We insert the key, value pair in its new order */
      $aux[$key] = $array[$key];
      /* We remove the element from the old array to save memory */
      unset($array[$key]);
    }
    /* The auxiliary array with the new order overwrites the old variable */
    $array = $aux;
  }

      shuffle_with_keys($foo);
      var_dump($foo);

原帖在这里： https ://www.php.net/manual/en/function.shuffle.php#83007