将平面反向数组化 [英] Reverse flatted array to multidimensional
问题描述
在另一个线程中,我询问了如何将具有特定样式的数组展平得到这样的东西:
In another thread i asked about flatten an array with a specific style to get something like this:
array(4) {
["one"]=> string(9) "one_value"
["two-four"]=> string(10) "four_value"
["two-five"]=> string(10) "five_value"
["three-six-seven"]=> string(11) "seven_value"
}
我在这里有很好的帮助,但现在我想知道如何反转该方法以再次获得相同的原始数组:
I've got some very good help there, but now im wondering how would i reverse this method to get again the same original array:
array(
'one' => 'one_value',
'two' => array
(
'four' => 'four_value',
'five' => 'five_value'
),
'three' => array
(
'six' => array
(
'seven' => 'seven_value'
)
)
)
我尝试了递归方法,但是没有运气。
我预先感谢所有帮助!
I've tried with recursive method but with no luck. I thank all the help in advance!
推荐答案
function expand($flat) {
$result = array();
foreach($flat as $key => $val) {
$keyParts = explode("-", $key);
$currentArray = &$result;
for($i=0; $i<count($keyParts)-1; $i++) {
if(!isSet($currentArray[$keyParts[$i]])) {
$currentArray[$keyParts[$i]] = array();
}
$currentArray = &$currentArray[$keyParts[$i]];
}
$currentArray[$keyParts[count($keyParts)-1]] = $val;
}
return $result;
}
请注意,上面的代码未经测试,仅用于举例说明。
&
运算符用于 $ currentArray
来存储值而不是引用某些节点在您的树中(由多维数组实现),因此更改 $ currentArray
也会更改 $ result
。
Note that the code above is not tested and is given only to illustrate the idea.
The &
operator is used for $currentArray
to store not the value but the reference to some node in your tree (implemented by multidimensional array), so that changing $currentArray
will change $result
as well.
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