PHP 随机洗牌数组维护键 => 值
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/4102777/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
PHP Random Shuffle Array Maintaining Key => Value
提问by lethalMango
I've been looking on google for the answer but can't seem to find something fool-proof and cant really afford to mess this up (going live into a production site).
我一直在 google 上寻找答案，但似乎无法找到一些万无一失的东西，并且无法真正搞砸（进入生产站点）。
What I have is an advanced search with 20+ filters, which returns an array including an ID and a Distance. What I need to do is shuffle these results to display in a random order every time. The array I have that comes out at the moment is:
我拥有的是带有 20 多个过滤器的高级搜索，它返回一个包含 ID 和距离的数组。我需要做的是随机排列这些结果，每次都以随机顺序显示。我现在出来的数组是：
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 )
)
What I need to be able to do is randomise or order of these every time but maintain the id and distance pairs, i.e.:
我需要能够做的是每次随机化或排序这些，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 )
)
Thanks :)
谢谢 ：）
回答by karim79
The first user postunder the shuffledocumentation:
Shuffle associative and non-associative array while preserving key, value pairs. Also returns the shuffled array instead of shuffling it in place.
混洗关联和非关联数组，同时保留键、值对。还返回混洗后的数组，而不是原地混洗。
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;
}
Test case:
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));
回答by Hamish
As of 5.3.0 you could do:
从 5.3.0 开始，您可以执行以下操作：
uksort($array, function() { return rand() > rand(); });
回答by v1r00z
Take a look to this function here :
在此处查看此功能：
$foo = array('A','B','C');
function shuffle_with_keys(&$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($foo);
Original post here : http://us3.php.net/manual/en/function.shuffle.php#83007
原帖在这里：http: //us3.php.net/manual/en/function.shuffle.php#83007
回答by Jake Wilson
function shuffle_assoc($array)
{
$keys = array_keys($array);
shuffle($keys);
return array_merge(array_flip($keys), $array);
}
回答by chaudruc
I was having a hard time with most of the answers provided - so I created this little snippet that took my arrays and randomized them while maintaining their keys:
我对提供的大部分答案都感到很困难 - 所以我创建了这个小片段，它使用我的数组并在维护它们的键的同时随机化它们：
function assoc_array_shuffle($array)
{
$orig = array_flip($array);
shuffle($array);
foreach($array AS $key=>$n)
{
$data[$n] = $orig[$n];
}
return array_flip($data);
}
回答by JesseBuesking
Try using the fisher-yates algorithm from here:
尝试使用此处的 Fisher-yates 算法：
function shuffle_me($shuffle_me) {
$randomized_keys = array_rand($shuffle_me, count($shuffle_me));
foreach($randomized_keys as $current_key) {
$shuffled_me[$current_key] = $shuffle_me[$current_key];
}
return $shuffled_me;
}
I had to implement something similar to this for my undergraduate senior thesis, and it works very well.
我不得不为我的本科毕业论文实现类似的东西，而且效果很好。
回答by cwd
Charles Iliya Krempeauxhas a nice writeupon the issue and a function that worked really well for me:
Charles Iliya Krempeaux有一篇关于这个问题的好文章和一个对我来说非常有效的函数：
function shuffle_assoc($array)
{
// Initialize
$shuffled_array = array();
// Get array's keys and shuffle them.
$shuffled_keys = array_keys($array);
shuffle($shuffled_keys);
// Create same array, but in shuffled order.
foreach ( $shuffled_keys AS $shuffled_key ) {
$shuffled_array[ $shuffled_key ] = $array[ $shuffled_key ];
} // foreach
// Return
return $shuffled_array;
}
回答by Tom Kim
I tried the most vote solution didn't popular shuffle list. This is the change I made to make it work. I want my array key starting from 1.
我尝试了最多投票的解决方案没有流行的洗牌列表。这是我为使其工作所做的更改。我希望我的数组键从 1 开始。
$list = array_combine(range(1,10),range(100,110));
$shuffle_list = shuffle_assoc($list);
function shuffle_assoc($list)
{
if (!is_array($list)) return $list;
$keys = array_keys($list);
shuffle($list);
$random = array();
foreach ($keys as $k => $key) {
$random[$key] = $list[$k];
}
return $random;
}
回答by Gautier
Answer using shuffle always return the same order. Here is one using random_int() where the order is different each time it is used:
使用 shuffle 的答案总是返回相同的顺序。这是一个使用 random_int() 的方法，每次使用时顺序都不同：
function shuffle_assoc($array)
{
while (count($array)) {
$keys = array_keys($array);
$index = $keys[random_int(0, count($keys)-1)];
$array_rand[$index] = $array[$index];
unset($array[$index]);
}
return $array_rand;
}
