Explanation of how to obtain binary tree image in PHP

This article mainly introduces the method of PHP to obtain the binary tree image, involving the related operation skills of PHP using queue to flip the binary tree. Friends in need can refer to the following

The example of this article tells the method of PHP to obtain the binary tree image. method. Share it with everyone for your reference, the details are as follows:

Question

Operate the given binary tree and transform it into a mirror image of the source binary tree.

Solution idea

There are two ways to flip the binary tree, recursive and non-recursive. Non-recursive is to use a queue.

Implementation code

<?php
/*class TreeNode{
 var $val;
 var $left = NULL;
 var $right = NULL;
 function __construct($val){
  $this->val = $val;
 }
}*/
function Mirror(&$root)
{
 if($root == NULL)
  return 0;
 $queue = array();
 array_push($queue, $root);
 while(!empty($queue)){
  $node = array_shift($queue);
  $tmp = $node->left;
  $node->left = $node->right;
  $node->right = $tmp;
  if($node->left != NULL)
   array_push($queue, $node->left);
  if($node->right != NULL)
   array_push($queue, $node->right);
 }
}

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