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php如何实现链表?

php实现链表的方法:首先定义一个节点类,代码为【function __construct($val=null)】;然后实现链表的实现类,代码为【function_construct $this->dummyhead = new Nod】。

php实现链表的方法:

首先定义一个节点类

class Node{
    public $val;
    public $next;
    function __construct($val=null){
   $this->val = $val;
   $this->next = null;
    }
}

链表的实现类

class MyLinkedList {
    public $dummyhead; //定义一个虚拟的头结点
    public $size;
  
    function __construct() {
   $this->dummyhead = new Node(); 
   $this->size = 0;
    }
  
 
    function get($index) {
   if($index < 0 || $index >= $this->size)
  return -1;
   $cur = $this->dummyhead;
   for($i = 0; $i < $index; $i++){
  $cur = $cur->next;
   }
   return $cur->next->val;
    }
  
    function addAtHead($val) {
   $this->addAtIndex(0,$val);
    }
  
  
    function addAtTail($val) {
   $this->addAtIndex($this->size,$val);
    }
  
    function addAtIndex($index, $val) {
   if($index < 0 || $index > $this->size)
  return;
   $cur = $this->dummyhead;
   for($i = 0; $i < $index; $i++){
  $cur = $cur->next;
   }
   $node = new Node($val);
   $node->next = $cur->next;
   $cur->next = $node;
   $this->size++;
    }
  
    function deleteAtIndex($index) {
   if($index < 0 || $index >= $this->size)
  return;
   $cur = $this->dummyhead;
   for($i = 0; $i < $index; $i++){
  $cur = $cur->next;
   }
   $cur->next = $cur->next->next;
   $this->size--;
    }
}

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