最近做了一个项目,其中有这样一个需求要实现,原有帖子列表A,现在需要在A中推广新业务B,那么需要在A列表中1:1混合B中的数据,随机混合,但是需要保持A和B两列原来的数据排序,具体详情请看下文。
原理
获知总共元素数量N;
for循环N次,取随机数;
根据随机数依次从头获取A或B的值,推入新数组中;
代码:
//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; }
示例:
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', )
php数组随机排序
<?php $array = array('A','2','3','4','5','6','7','8','9','10','J','Q','K'); shuffle($array); //随机排序数组 print_r($array); //输出数组 ?>

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