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	`1`	`+## 题目`
	`2`	`+`
	`3`	`+* 876. 链表的中间结点`
	`4`	`+`
	`5`	`+给定一个头结点为 head 的非空单链表,返回链表的中间结点。`
	`6`	`+`
	`7`	`+如果有两个中间结点,则返回第二个中间结点。`
	`8`	`+`
	`9`	`+## 思路`
	`10`	`+`
	`11`	`+快慢指针。`
	`12`	`+`
	`13`	`+## 代码`
	`14`	`+`
	`15`	+```php
	`16`	`+class Solution {`
	`17`	`+`
	`18`	`+ /**`
	`19`	`+ * @param ListNode $head`
	`20`	`+ * @return ListNode`
	`21`	`+ */`
	`22`	`+ function middleNode($head) {`
	`23`	`+ $slow = $head;`
	`24`	`+ $fast = $head;`
	`25`	`+ while ($fast && $fast->next) {`
	`26`	`+ $slow = $slow->next;`
	`27`	`+ $fast = $fast->next->next;`
	`28`	`+ }`
	`29`	`+ return $slow;`
	`30`	`+ }`
	`31`	`+}`
	`32`	+```

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