我有這棵樹：Array( [0] => Array ( [id] => 1 [parent_id] => 0 [title] => Parent Page [children] => Array ( [0] => Array ( [id] => 2 [parent_id] => 1 [title] => Sub Page ), [1] => Array ( [id] => 5 [parent_id] => 1 [title] => Sub Page 2 ) ) ) [1] => Array ( [id] => 4 [parent_id] => 0 [title] => Another Parent Page ))我正在尋找從上到下的顯示。并顯示類似這樣的內容：1 1.21.54但如果我有 id 3，它是 5 的葉子，我會喜歡這樣：11.21.51.5.34我進行了很多搜索，當我使用遞歸時，我的大腦是有限的。我已經嘗試過這個：function printAll($a){ foreach ($a as $v){ if (!array_key_exists('children', $v)){ debugLog($v['id']); return; } else{ $arrayChildrens = $v['children']; foreach($arrayChildrens as $c){ $arrayChildrens = $c['children']; $this->printAll($arrayChildrens); } } }}但不起作用..我嘗試開始只是為了顯示1254但我的目標是在 id 之前顯示 id 父母（就像我之前向你展示的那樣）多謝 ！
2 回答
元芳怎么了
TA貢獻1798條經驗 獲得超7個贊
這個函數應該會給你你期望的輸出。
function printAll($a, $prefix = '') {
//loop through $a
foreach($a as $v) {
//echo current level `id` with previous `$prefix`
echo "{$prefix}{$v['id']}\n";
//check if current level contains children
if(!empty($v['children'])) {
//clean up prefix to remove extra `.` at the end of prefixes
$prev_prefix = rtrim($prefix, '.');
//recurse printAll again passing the children as `$a` and a `$prefix` being the previous levels combined e.g `1.5`
//also clean up extra periods at the start of the prefix
printAll($v['children'], ltrim("{$prev_prefix}.{$v['id']}.", "."));
}
}
}
輸出：
1
1.2
1.5
1.5.3
4
使用正確的回報
通常，對于一個函數，您實際上希望該函數返回值，而不是自動將它們回顯到您的頁面。如果您希望此函數返回一個值數組而不是回顯它們，您可以這樣做：
function printAll($a, $level = '', $values = []) {
foreach($a as $v) {
$values[] = $value = "{$level}{$v['id']}";
if(!empty($v['children'])) {
$values = printAll($v['children'], "{$value}.", $values);
}
}
return $values;
}
將會得到這樣的結果：
Array
(
[0] => 1
[1] => 1.2
[2] => 1.5
[3] => 1.5.3
[4] => 4
)
MYYA
TA貢獻1868條經驗 獲得超4個贊
這應該可以完成工作。
$arr = array(
array(
'id' => 1,
'parent_id' => 0,
'title' => 'Parent Page',
'children' => array(
array(
'id' => 2,
'parent_id' => 1,
'title' => 'Sub Page',
),
array(
'id' => 5,
'parent_id' => 1,
'title' => 'Sub Page 2',
'children' => array(
array(
'id' => 7,
'parent_id' => 5,
'title' => 'Sub Page',
),
array(
'id' => 8,
'parent_id' => 5,
'title' => 'Sub Page 2',
)
)
)
)
),
array(
'id' => 4,
'parent_id' => 0,
'title' => 'Another Parent Page',
)
);
function printAll($arr, $parent = [])
{
if (is_array($arr)) {
foreach ($arr as $k => $v) {
if (isset($v['id'])) {
$parent[] = $v['id'];
echo implode('.', $parent) . PHP_EOL;
}
if (isset($v['children'])) {
printAll($v['children'], $parent);
}
array_pop($parent);
}
}
}
printAll($arr);
輸出
1
1.2
1.5
1.5.7
1.5.8
4
工作演示。
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