Leetcode 简单十九 删除排序链表中的重复元素

删除排序链表中的重复元素：

PHP 16ms：

/**
 * Definition for a singly-linked list.
 * class ListNode {
 *     public $val = 0;
 *     public $next = null;
 *     function __construct($val) { $this->val = $val; }
 * }
 */
class Solution {

    /**
     * @param ListNode $head
     * @return ListNode
     */
    function deleteDuplicates($head) {
        $curr = $head;
        while($curr->next != null){
            if($curr->val == $curr->next->val){
                $curr->next = $curr->next->next;
            }else{
                $curr = $curr->next;
            }
        }
        return $head;
    }
}