<?php
/**
* 循环链表
* 将单链表的最后一个结点指针为空，改为指向头结点
* 循环链表的空则是 head->next = head
* todo
*/
class ListNode {
public $next = null;
public $data = '';
}
class CircularLinkedList {
/**
* @param $listNode
* 指向链表的第一个结点
* @param array $arr
*/
public function init($listNode, array $arr)
{
$j = 0;
$count = count($arr);
if ($count == 0) {
return;
}
while ($j<$count) {
if ($listNode->next == null) { // 链表为空
$node = new ListNode();
$node->data = $arr[$j];
$node->next = $listNode;
} else {
}
$j++;
}
}
}
$node = new ListNode();
$circularLinkedList = new CircularLinkedList();
$circularLinkedList->init($node, [11, 13, 54, 55, 78]);
var_dump($node);
