兰德();排除并已经随机生成的数字..？

发布于 2024-09-01 11:34:25 字数 519 浏览 7 评论 0原文

我有一个函数可以从表中调用与用户关联的用户。然后该函数使用 rand();函数从数组中选择 5 个随机选择的用户 ID！...

如果用户没有很多关联用户但高于最小值（如果低于 5，则仅按原样返回数组），那么它会给出不好的结果，因为重复随机数...

如何克服这个问题或从下一个随机数（）中排除先前选择的随机数；函数调用。

这是执行该工作的代码部分。请记住，这必须非常高效，因为该脚本到处都在使用。

$size = sizeof($users)-1;
    $nusers[0] = $users[rand(0,$size)];
    $nusers[1] = $users[rand(0,$size)];
    $nusers[2] = $users[rand(0,$size)];
    $nusers[3] = $users[rand(0,$size)];
    $nusers[4] = $users[rand(0,$size)];

    return $nusers;

提前致谢！斯特凡

原文

I have a function which calls a users associated users from a table. The function then uses the rand(); function to chose from the array 5 randomly selected userID's however!...

In the case where a user doesnt have many associated users but above the min (if below the 5 it just returns the array as it is) then it gives bad results due to repeat rand numbers...

How can overcome this or exclude a previously selected rand number from the next rand(); function call.

Here is the section of code doing the work. Bare in mind this must be highly efficient as this script is used everywhere.

$size = sizeof($users)-1;
    $nusers[0] = $users[rand(0,$size)];
    $nusers[1] = $users[rand(0,$size)];
    $nusers[2] = $users[rand(0,$size)];
    $nusers[3] = $users[rand(0,$size)];
    $nusers[4] = $users[rand(0,$size)];

    return $nusers;

Thanks in advance!
Stefan

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凉墨 2024-09-08 11:34:25

最简单的方法是使用 array_rand()：

$users = range(3, 10); // this is just example data
$nusers = array_rand($users, 5); // pick 5 unique KEYS from $users

foreach ($nusers as $key => $value)
{
  $nusers[$key] = $nusers[$value]; // replace keys with actual values
}

echo '<pre>';
print_r($nusers);
echo '</pre>';

PS：阅读此内容了解为什么应该使用 mt_rand() 而不是 rand()。

The simplest way is to use array_rand():

$users = range(3, 10); // this is just example data
$nusers = array_rand($users, 5); // pick 5 unique KEYS from $users

foreach ($nusers as $key => $value)
{
  $nusers[$key] = $nusers[$value]; // replace keys with actual values
}

echo '<pre>';
print_r($nusers);
echo '</pre>';

PS: Read this to know why you should use mt_rand() instead of rand().

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