PHP implements reverse order of linked list
The content of this article is about the implementation of linked list reverse order in PHP, which has certain reference value. Now I share it with everyone. Friends in need can refer to it
<?php
class Node {
public $str; public $next; function __construct ($str) {
$this->str = $str;
}
} //创建链表头
function createList () {
$head = new Node(null); return $head;
} //向链表$head中插入节点并赋值
function insertNode ($str, &$head) {
$node = new Node($str); $node->next = &$head->next; $head->next = &$node;
} //取出链表的第一个节点，相当于出队
function outQueue (&$head) {
$tmp = $head->next; $head->next = $head->next->next; $tmp->next = null; return $tmp;
} //将链表$head进行逆序
function reverse (&$head) {
$reversed = createList(null); while (null != $head->next) {
insertNode(outQueue($head), $reversed);
} return $reversed;
} $head = createList();
insertNode('hello', $head);
insertNode('world', $head);
insertNode('99999999999999', $head);
insertNode('888888888888888', $head);
insertNode('7777777777777', $head);
insertNode('66666666666666', $head);
insertNode('55555555555', $head);
insertNode('444444444444', $head);
insertNode('333333333333', $head);
insertNode('222222222222222', $head);
insertNode('111111111111', $head);
insertNode('000000000000000', $head);
print_r($head); $reversed = reverse($head); echo "<hr />";
print_r($reversed); //上面的方法没有在原链表上操作，不过他创建了一个新链表，
//虽然逻辑实现显得简单，但是太不专业
//下面贴出更加专业的逆序代码
function reverse2 (&$head) {
$q = $head->next->next; $head->next->next = null; while (null != $q) { $p = $q; $q = $p->next; $p->next = $head->next; $head->next = $p;
}
reverse2($head); echo "<hr />";
print_r($head);
} ?> Output result:
Linked list before reverse order:
Node Object ( [str] => [next] => Node Object ( [str] => 000000000000000 [next] => Node Object ( [str] ] => 111111111111 [next] => Node Object ( [str] => 222222222222222 [next] => Node Object ( [str] => 333333333333 [next] => > 444444444444 [next] => Node Object ( [str] => 55555555555 [next] => Node Object ( [str] => 66666666666666 [next] => Node Object ( [str] => 7777777777777 [next] => Node Object ( [str] => 888888888888888 [next] => Node Object ( [str] => 99999999999999 [next] => next] => Node Object ( [str] => hello [next] => ) ) ) ) ) ) ) ) ) ) ) ) ) )
The linked list after reverse order:
Node Object ( [str] => [next] => Node Object ( [str] => Node Object ( [str] => hello [next] => ) [next] => Node Object ( [str ] => Node Object ( [str] => world [next] => ) [next] => Node Object ( [str] => Node Object ( [str] => 99999999999999 [next] = > ) [next] => Node Object ( [str] => Node Object ( [str] => 888888888888888 [next] => ) [next] => Node Object ( [str] => Node Object ( [str] => 7777777777777 [next] => ) [next] => Node Object ( [str] => Node Object ( [str] => 66666666666666 [next] => ) [ next] => Node Object ( [str] => Node Object ( [str] => 55555555555 [next] => ) [next] => Node Object ( [str] => Node Object ( [ str] => 444444444444 [next] => ) [next] => Node Object ( [str] => Node Object ( [str] => 3333333333333 [next] => ) [next] => ; Node Object ( [str] => Node Object ( [str] => 222222222222222 [next] => ) [next] => Node Object ( [str] => Node Object ( [str] => ; 111111111111 [next] => ) [next] => Node Object ( [str] => Node Object ( [str] => 000000000000000 [next] => ) [next] => ) ) ) ) ) ) ) ) ) ) ) ) )
Related recommendations:
Use PHP to implement a singly linked list
How to implement a doubly linked list in PHP And sort
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