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PHP code:
<?php
class Node{
var $data; //Êý¾Ý
var $left; //×óº¢×Ó
var $right; //ÓÒº¢×Ó
//ǰÐò±éÀú
public function preTraverse(){
echo "$this->data<br>";
if($this->left != NULL)
$this->left->middleTraverse();
if($this->right != NULL){
$this->right->middleTraverse();
}
}

public function Node($data,$left,$right){
$this->data = $data;
$this->left = $left;
$this->right = $right;
}

}


$D=new Node("D",NULL,NULL);
$E = new Node("E",NULL,NULL);
$B = new Node("B",$D,$E);

$I=new Node("I",NULL,NULL);
$J = new Node("J",NULL,NULL);
$C = new Node("C",$I,$J);

$A = new Node("A",$B,$C);

$K=new Node("K",NULL,NULL);
$L = new Node("L",NULL,NULL);
$G = new Node("G",$K,$L);

$M=new Node("M",NULL,NULL);
$N = new Node("JN",NULL,NULL);
$H = new Node("H",$M,$N);

$E = new Node("E",$G,$H);

$PP = new Node("PP",$A,$E);

$PP->middleTraverse();





?>


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