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Merge pull request #2568 from alanx15a2/master

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二叉树的递归遍历 add php version
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程序员Carl
2024-06-24 11:55:01 +08:00
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parent f1c6f81a68 c4c5b15f23
commit 05bc2cef6f
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56
problems/二叉树的递归遍历.md
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@ -671,6 +671,62 @@ public void Traversal(TreeNode cur, IList<int> res)
} }
``` ```
### PHP
```php
// 144.前序遍历
function preorderTraversal($root) {
$output = [];
$this->traversal($root, $output);
return $output;
}
function traversal($root, array &$output) {
if ($root->val === null) {
return;
}
$output[] = $root->val;
$this->traversal($root->left, $output);
$this->traversal($root->right, $output);
}
```
```php
// 94.中序遍历
function inorderTraversal($root) {
$output = [];
$this->traversal($root, $output);
return $output;
}
function traversal($root, array &$output) {
if ($root->val === null) {
return;
}
$this->traversal($root->left, $output);
$output[] = $root->val;
$this->traversal($root->right, $output);
}
```
```php
// 145.后序遍历
function postorderTraversal($root) {
$output = [];
$this->traversal($root, $output);
return $output;
}
function traversal($root, array &$output) {
if ($root->val === null) {
return;
}
$this->traversal($root->left, $output);
$this->traversal($root->right, $output);
$output[] = $root->val;
}
```
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