如何在PHP中使用数组创建嵌套数组

Question

说,我们有一个数组:array(1,2,3,4,...) 我想将其转换为:

array(
    1=>array(
        2=>array(
            3=>array(
                4=>array()
            )
        )
    )
)

有人可以帮忙吗？
谢谢

编辑通过迭代获得解决方案会很好.

Answer 1

$x = count($array) - 1;
$temp = array();
for($i = $x; $i >= 0; $i--)
{
    $temp = array($array[$i] => $temp);
}

Answer 2

您可以简单地创建一个递归函数：

<?php
function nestArray($myArray)
{
    if (empty($myArray))
    {
        return array();
    }

    $firstValue = array_shift($myArray);
    return array($firstValue => nestArray($myArray));
}
?>

Answer 3

好吧，尝试这样的事情：

$in  = array(1,2,3,4); // Array with incoming params
$res = array();        // Array where we will write result
$t   = &$res;          // Link to first level
foreach ($in as $k) {  // Walk through source array
  if (empty($t[$k])) { // Check if current level has required key
    $t[$k] = array();  // If does not, create empty array there
    $t = &$t[$k];      // And link to it now. So each time it is link to deepest level.
  }
}
unset($t); // Drop link to last (most deep) level
var_dump($res);
die();

输出：

array(1) {
  [1]=> array(1) {
    [2]=> array(1) {
      [3]=> array(1) {
        [4]=> array(0) {
        }
      }
    } 
  }
}