//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;
}

$array1 = array(1, 2, 3, 4);
$array2 = array('a', 'b', 'c', 'd', 'e');

$mergeArray = array (
 0 => 'a',
 1 => 1,
 2 => 'b',
 3 => 2,
 4 => 'c',
 5 => 'd',
 6 => 3,
 7 => 4,
 8 => 'e',
)

<?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 
?>