[Algorithm] PHP randomly merges arrays and maintains original ordering

Scenario

The original post list A, and now you need to promote new business B in A, you need to mix B’s data in list A at a ratio of 1:1, randomly, but you need to maintain the original data ordering of lists A and B. Please refer to the following examples for details.

Principle

1. Get the total number of elements N;
2. for loop N times and get random numbers;
3. Get the value of A or B from the beginning based on the random number and push it into a new array;

Code:

<code>//随机合并两个数组元素，保持原有数据的排序不变（即各个数组的元素在合并后的数组中排序与自身原来一致）
function shuffleMergeArray() {
    $mergeArray = array();
    $sum = count($array1) + count($array2);
    for ($k = $sum; $k > 0; $k--) {
        $number = mt_rand(1, 2);
        if ($number == 1) {
            $mergeArray[] = $array2 ? array_shift($array2) : array_shift($array1);
        } else {
            $mergeArray[] = $array1 ? array_shift($array1) : array_shift($array2);
        }
    }


    return $mergeArray;
}</code>

Example:

<code>合并前的数组：
$array1 = array(1, 2, 3, 4);
$array2 = array('a', 'b', 'c', 'd', 'e');

合并后的数据：
$mergeArray = array (
  0 => 'a',
  1 => 1,
  2 => 'b',
  3 => 2,
  4 => 'c',
  5 => 'd',
  6 => 3,
  7 => 4,
  8 => 'e',
)</code>

The above introduces [Algorithm] PHP randomly merges arrays and maintains the original order, including the content. I hope it will be helpful to friends who are interested in PHP tutorials.