<?php
/**
 * 单链表
 */ 
class Demo
{
 private $id;
 public $name;
 public $next;

 public function __construct ($id = '', $name = '')
 {
  $this->id = $id;
  $this->name = $name;
 }

 static public function show ($head)
 {
  $cur = $head;
  while ($cur->next) {
   echo $cur->next->id,'###',$cur->next->name,'<br />';
   $cur = $cur->next;
  }
  echo '<hr />';
 }

 //尾插法
 static public function push ($head, $node)
 {
  $cur = $head;
  while (NULL != $cur->next) {
   $cur = $cur->next;
  }
  $cur->next = $node;
  return $head;
 }

 static public function insert($head, $node)
 {
  $cur = $head;
  while (NULL != $cur->next) {
   if ($cur->next->id > $node->id) {
    break;
   }
   $cur = $cur->next;
  }
  $node->next = $cur->next;
  $cur->next = $node;
  return $head;
 }

 static public function edit($head, $node)
 {
  $cur = $head;
  while (NULL != $cur->next) {
   if ($cur->next->id == $node->id) {
    break;
   }
   $cur = $cur->next;
  }
  $cur->next->name = $node->name;
  return $head;  
 }

 static public function pop ($head, $node)
 {
  $cur = $head;
  while (NULL != $cur->next) {
   if ($cur->next == $node) {
    break;
   }
   $cur = $cur->next;
  }
  $cur->next = $node->next;
  return $head;   
 }
}

$team = new Demo();
$node1 = new Demo(1, '唐三藏');
Demo::push($team, $node1);
$node1->name = '唐僧';
Demo::show($team);

// Demo::show($team);
$node2 = new Demo(2, '孙悟空');
Demo::insert($team, $node2);
// Demo::show($team);
$node3 = new Demo(5, '白龙马');
Demo::push($team, $node3);
// Demo::show($team);
$node4 = new Demo(3, '猪八戒');
Demo::insert($team, $node4);
// Demo::show($team);
$node5 = new Demo(4, '沙和尚');
Demo::insert($team, $node5);
// Demo::show($team);
$node4->name = '猪悟能';//php对象传引用，所以Demo::edit没有必要
// unset($node4);
// $node4 = new Demo(3, '猪悟能');
// Demo::edit($team, $node4);
Demo::pop($team, $node1);

Demo::show($team);