我有一个 API 调用的返回，该调用将类别树作为平面数组提供，其中父/子关系用重复的字符串拼写出来。 一个小样本：
[0] => Architecture & Street Scenes
[1] => Architecture & Street Scenes/Architectural Detail
[2] => Architecture & Street Scenes/Architectural Detail/Cast or Wrought Ironwork
[3] => Architecture & Street Scenes/Architectural Detail/Cast or Wrought Ironwork/Balconies
[4] => Architecture & Street Scenes/Architectural Detail/Cast or Wrought Ironwork/Fences
[5] => Architecture & Street Scenes/Courtyards
[6] => Architecture & Street Scenes/Exteriors & Street Scenes
[7] => Architecture & Street Scenes/Interiors
[8] => Architecture & Street Scenes/Street Lamps
[9] => Art & Culture
[10] => Art & Culture/Dance
有没有一种优雅的方法使用 PHP 从那里开始消除重复并通过拥有子数组来表达关系？
[0] => Architecture & Street Scenes
[0] => Architectural Detail
[0] => Cast or Wrought Ironwork
[1] => Cast or Wrought Ironwork
[0] => Balconies
[1] => Fences
[1] => Courtyards
[2] => Exteriors & Street Scenes
[3] => Interiors
[4] => Street Lamps
[1] => Art & Culture
[0] => Dance
我的想法是，您将每个令牌用作创建哈希表的键。
<?php
$api = array(
"Architecture & Street Scenes",
"Architecture & Street Scenes/Architectural Detail",
"Architecture & Street Scenes/Architectural Detail/Cast or Wrought Ironwork",
"Architecture & Street Scenes/Architectural Detail/Cast or Wrought Ironwork/Balconies",
"Architecture & Street Scenes/Architectural Detail/Cast or Wrought Ironwork/Fences",
"Architecture & Street Scenes/Courtyards",
"Architecture & Street Scenes/Exteriors & Street Scenes",
"Architecture & Street Scenes/Interiors",
"Architecture & Street Scenes/Street Lamps",
"Art & Culture",
"Art & Culture/Dance",
);
$end = array();
foreach ($api as $v) {
$tokens = explode('/', $v);
$parent = &$end;
foreach ($tokens as $token) {
if (!array_key_exists($token, $parent)) {
$parent[$token] = array();
}
$parent = &$parent[$token];
}
}
print_r($end);
输出：
Array
(
[Architecture & Street Scenes] => Array
(
[Architectural Detail] => Array
(
[Cast or Wrought Ironwork] => Array
(
[Balconies] => Array
(
)
[Fences] => Array
(
)
)
)
[Courtyards] => Array
(
)
[Exteriors & Street Scenes] => Array
(
)
[Interiors] => Array
(
)
[Street Lamps] => Array
(
)
)
[Art & Culture] => Array
(
[Dance] => Array
(
)
)
)
因此，当您迭代它们时，您可以执行以下操作：
foreach ($end as $k => $v) {
echo $k; //Here is your top level element.
//You'd then iterate through it's children which are in $v.
}
有几种方法可以做到这一点，这里有一个递归选项，无论输入数据的顺序如何，它都会实现相同的目标。
$output = array();
foreach($api_data as $line){
process_children($line, $output);
}
function process_children($line, &$output){
$split = explode('/', $line, 2);
if(!isset($output[$split[0]]))
$output[$split[0]] = array();
if(isset($split[1]))
process_children($split[1], $output[$split[0]]);
}
print_r($output);