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基于php实现随机合并数组并排序(原排序)_php实例

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Release: 2016-06-07 17:10:46
Original
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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;
}
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示例:

合并前的数组:

$array1 = array(1, 2, 3, 4);
$array2 = array('a', 'b', 'c', 'd', 'e');
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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',
)
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php数组随机排序

<&#63;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 
&#63;> 
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