Question

我有一个array，其中包含40这样的元素

$i = array('1','2','3','4','5','6','7','8','9','10','11',
'12','13','14','15','16','17','18','19','20','21','22','23','24',
'25','26','27','28','29','30','31','32','33','34','35',
'36','37','38','39','40');

现在我有4个5%, 10%, 15%, 20%

等变体

要求是我需要在减去所需的array values后随机选择variation。

假设我使用了5%变体，因此我需要将5%与数组分开，即2元素，我需要从数组中随机删除并保留其余38随机的新array中的元素。因此，array以及减去的元素都必须位于两个不同的array中。

我需要一个带有两个参数的函数，一个是variation，另一个是array，即结果array或减去元素array。

所有其他变体都遵循相同的顺序。

Answer 1

虽然我不确定 rest 38元素在一个新数组中随机是什么意思，例如这是否意味着新阵列也被洗牌？这就是我想出来的。

<?php

function splitArray($variation, $array) {

    $count = count($array); // Count the elements in the given array
    $removeNumber = floor($count*($variation/100)); // Calculate the number of elements to remove

    // Create an array holding the index numbers for splicing, these numbers are random.
    for($i=0; $i<$removeNumber; $i++) {
        $removeArray[] = rand(0,$count-1);
    }

    // Loop through the removeArray to retrieve the indexes to splice at.
    for($i=0; $i<count($removeArray); $i++) {
        $subArray[] = $array[$removeArray[$i]];
        array_splice($array, $removeArray[$i], 1);
    }

    // return the newly spliced array and the spliced items array
    return array($array, $subArray);

}

$oldArray = array('1','2','3','4','5','6','7','8','9','10','11',
    '12','13','14','15','16','17','18','19','20','21','22','23','24',
    '25','26','27','28','29','30','31','32','33','34','35',
    '36','37','38','39','40');

$array = splitArray(5, $oldArray);
$subArray = $array[0];
$newArray = $array[1];

Answer 2

<?php

function subtractFromArray($array,$percentage){
//Randonmising the array
shuffle($array);

//percentage numeric equivalent wrt array aize
$substract_variation_count = floor(sizeof($array) * $percentage/100);

//New extracted array
$new_array = array_slice($array,$substract_variation_count);

//retuns the new array with 38 elements
return $new_array;

}

//array with all elements
$array = array('1','2','3','4','5','6','7','8','9','10','11',
'12','13','14','15','16','17','18','19','20','21','22','23','24',
'25','26','27','28','29','30','31','32','33','34','35',
'36','37','38','39','40');

//get new array
$new_array = subtractFromArray($array,5);
//print new array
print_r($new_array);

//Substracted array with 2 elements
$substrcated_array = array_diff($array,$new_array);
print_r($substrcated_array);

?>

使用php从数组中随机减去所需的百分比

2 个答案: