Question

我正在尝试使用array_rand获得比数组更多的随机值。有什么办法吗？

    $amount = 6;

    $numbers = array(
       "10",
       "20", 
       "30"
    );

    array_rand($numbers, $amount);

我只能得到3个值，因为数组只有3个值。但是，如果我想获得6个值（当然，如果$ qty>数组具有，将会重复，但是没有问题）

Answer 1

只需使用不依赖于rand数组功能的自定义解决方案即可：

查看实际效果： https://ideone.com/Kimjx4

// The quantity you want
$quantity = 6;

// the values to choose from
$numbers = array(
       "10",
       "20", 
       "30"
    );
// get the keys so it will also work with associative arrays
$keys = array_keys($numbers);

// how many elements are there in our source array
$length = count($keys);    

// where we store our result
$result = [];

// iterate for x quantity
for($c=0;$c < $quantity; $c++) {
   // add random result from source to result array.
   $result[] = $numbers[$keys[rand(0, $length-1)]];
}

var_dump($result);

如果您希望将其用作还可以处理关联键的功能 https://ideone.com/SqTrKg

function getRandomResults(array $source, $quantity) {
    $keys = array_keys($source);

    // how many elements are there in our source array
    $length = count($keys);    

    // where we store our result
    $result = [];

    // iterate for x quantity
    for($c=0;$c < $quantity; $c++) {
       // add random result from source to result array.
       $result[] = $source[$keys[rand(0, $length-1)]];
    }
    return $result;
}
$res = getRandomResults([
           "10",
           "20", 
           "30"
        ], 6);
var_dump($res);

Answer 2

我也想尝试））

function my_array_rand(array $arr, int $count): array
{
    assert($count > 0);

    if ($count <= count($arr)) {
        return array_rand($arr, $count);
    }

    foreach (range(1, $count) as $index) {
        $res[] = array_rand($arr, 1);
    }

    return $res ?? [];
}


$arr = [1,2,3,4,5,6,7];
var_dump(my_array_rand($arr, 100));

array_rand-如何获得比数组更多的值？

2 个答案: