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	`1`	`+## 题目`
	`2`	`+`
	`3`	`+## 思路`
	`4`	`+`
	`5`	`+## 代码`
	`6`	`+`
	`7`	+```php
	`8`	`+/**`
	`9`	`+ * Definition for a singly-linked list.`
	`10`	`+ * class ListNode {`
	`11`	`+ * public $val = 0;`
	`12`	`+ * public $next = null;`
	`13`	`+ * function __construct($val = 0, $next = null) {`
	`14`	`+ * $this->val = $val;`
	`15`	`+ * $this->next = $next;`
	`16`	`+ * }`
	`17`	`+ * }`
	`18`	`+ */`
	`19`	`+class Solution {`
	`20`	`+`
	`21`	`+ /**`
	`22`	`+ * @param ListNode $head`
	`23`	`+ * @return ListNode`
	`24`	`+ */`
	`25`	`+ function deleteDuplicates($head) {`
	`26`	`+ if (!$head) {`
	`27`	`+ return null;`
	`28`	`+ }`
	`29`	`+ $cur = $head;`
	`30`	`+ while ($cur->next) {`
	`31`	`+ if ($cur->val == $cur->next->val) {`
	`32`	`+ $cur->next = $cur->next->next;`
	`33`	`+ } else {`
	`34`	`+ $cur = $cur->next;`
	`35`	`+ }`
	`36`	`+ }`
	`37`	`+ return $head;`
	`38`	`+ }`
	`39`	`+}`
	`40`	+```
	`41`	`+`

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