PHP实现完全二叉树

PHP代码实现（暂时实现添加节点、层次遍历节点，删除节点后续更新）

value)){
		return $node;
	}else{
		if(empty($node->leftNode->value)){
			return $node->leftNode;
		}else if(empty($node->rightNode->value)){
			return $node->rightNode;
		}else{
			if(empty($parent) || $node->value == $parent->rightNode->value){
				return findEmpytNode($node->leftNode, $node);
			}else{
				return findEmpytNode($parent->rightNode, $node);
			}
		}
	}
}

/* 添加节点 */
function addNode($node, $value){
	$emptyNode = findEmpytNode($node);
	setNode($emptyNode, $value);
}

/* 设置节点 */
function setNode($node, $value){
	$node->value = $value;
	$node->leftNode = new Node();
	$node->rightNode = new Node();
}

/* 打印 */
function printTree($node, $parent = null){
	if(empty($node->value)) return ;
	echo $node->leftNode->value;
	echo $node->rightNode->value;
	if(empty($parent) || $node->value == $parent->rightNode->value){
		printTree($node->leftNode, $node);
	}else{
		printTree($parent->rightNode, $node);
	}
}

$head = new Node();
setNode($head, 1);
addNode($head, 2);
addNode($head, 3);
addNode($head, 4);
addNode($head, 5);
addNode($head, 6);

printTree($head);

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