Detailed explanation of steps to obtain binary tree image with PHP

This time I will bring you a detailed explanation of the steps to obtain a binary tree image with PHP. What are the precautions for PHP to obtain a binary tree image. The following is a practical case, let's take a look.

Question

Manipulate 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 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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