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problems
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`‎problems/141-linked-list-cycle.md`

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	`1`	`+## 题目`
	`2`	`+`
	`3`	`+`
	`4`	`+* 141. 环形链表`
	`5`	`+`
	`6`	`+给定一个链表,判断链表中是否有环。`
	`7`	`+`
	`8`	`+## 思路`
	`9`	`+`
	`10`	`+`
	`11`	`+## 代码`
	`12`	`+`
	`13`	+```php
	`14`	`+class Solution {`
	`15`	`+ /**`
	`16`	`+ * @param ListNode $head`
	`17`	`+ * @return Boolean`
	`18`	`+ */`
	`19`	`+ function hasCycle($head) {`
	`20`	`+ $fast = $head;`
	`21`	`+ $slow = $head;`
	`22`	`+ while($fast->next) {`
	`23`	`+ $slow = $slow->next;`
	`24`	`+ $fast = $fast->next->next;`
	`25`	`+ if ($slow == $fast) {`
	`26`	`+ return true;`
	`27`	`+ }`
	`28`	`+ }`
	`29`	`+ return false;`
	`30`	`+ }`
	`31`	`+}`
	`32`	+```

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