How to ensure the relative position of elements after the PHP array is shuffled?

Use the shuffle function to disrupt the order of the PHP array while keeping the relative position of the elements unchanged. This function randomly shuffles the array, and the positional relationship between elements will not change. The shuffle() function acts on an array and randomly shuffles its order, but the relative position of the elements remains consistent.

PHP maintains the relative position of elements after shuffling the order of the array

Background

For randomly shuffling the order of the array, it is usually necessary to shuffle the array while keeping the relative position of the elements unchanged.

Solution

Use the shuffle function. This function works on an array, randomly shuffling the order of its elements, but keeping the relative positions between the elements unchanged.

Code example

$array = [1, 2, 3, 4, 5];

// 使用 shuffle 函数打乱数组顺序
shuffle($array);

// 打印打乱后的数组
print_r($array);

Practical case

Imagine a lottery program that needs to randomly select 10 candidates from the candidate list Award winner. At the same time, we want to keep the candidates' relative rankings before and after the draw unchanged.

$candidates = array(
    "Alice",
    "Bob",
    "Carol",
    "Dave",
    "Eve",
);

// 使用 shuffle 打乱候选人顺序
shuffle($candidates);

// 抽取的前 10 个候选人
$winners = array_slice($candidates, 0, 10);

// 打印获奖候选人
print_r($winners);

In this code, the shuffle function ensures that the relative ranking of the candidates remains consistent, so the list of winning candidates is displayed in their relative order in the original list of candidates.

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