binary_tree.php

<?php
/**
 * This is a class for creating the binary nodes
 */
class BinaryNode { 

    private $data; 
    private $left; 
    private $right; 

    public function __construct(string $data = NULL) { 
      $this->data = $data; 
      $this->left = NULL; 
      $this->right = NULL; 
    } 

    /**
     * Adds child nodes
     */
    public function addChildren($left, $right) { 
      $this->left = $left;
      $this->right = $right;
    }

}