<?php/** * 單鏈表 */ 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);$node2 = new Demo(2, '孫悟空');Demo::insert($team, $node2);// Demo::show($team);$node3 = new Demo(5, '白龍馬');Demo::push($team, $node3);// Demo::show($team);$node4 = new Demo(3, '豬八戒');Demo::insert($team, $node4);// Demo::show($team);$node5 = new Demo(4, '沙和尚');Demo::insert($team, $node5);// Demo::show($team);$node4->name = '豬悟能';//php對象傳引用，所以Demo::edit沒有必要// unset($node4);// $node4 = new Demo(3, '豬悟能');// Demo::edit($team, $node4);Demo::pop($team, $node1);Demo::show($team);