PHP small tutorial to implement a two-way linked list_PHP tutorial

class Hero
{
public $pre=null;
public $no;
public $name;
       public $next=null ;
public function __construct($no='',$name='')
{
$this->no=$no;
name=$name;
}
static public function addHero($head,$hero)
{
$cur = $head;
$isExist=false;
//Determine whether the current linked list is empty $hero->pre=$cur;
                              
                                                                                                                                             ​                while($cur->next!=null)
{
                                                                                                                                                                                                                                        Break; ->no == $hero->no)
                                                                                                                     lt;br>The same number cannot be added";
                                                                                                                                                                    =$cur->next;
                                     
                    if(!$isExist)
                    {
                        if($cur->next!=null)
                        {
                            $hero->next=$cur->next;
                        }
                        $hero->pre=$cur;
                        if($cur->next!=null)
                        {
                            $hero->next->pre=$hero;
                        }
                        $cur->next=$hero;                   
                    }
                }
            }
            //遍历
            static public function showHero($head)
            {
                $cur=$head;
                while($cur->next!=null)
                {
                    echo "
编号：".$cur->next->no."名字：".$cur->next->name;
                    $cur=$cur->next;
                }
            }
            static public function delHero($head,$herono)
            {
                $cur=$head;
                $isFind=false;
                while($cur!=null)
                {
                    if($cur->no==$herono)
                    {
                        $isFind=true;
                        break;
                    }
                                                                                                                                                                                                                                                                                                                                         )
                                                                                                     $cur->pre->next=$cur->next;
}
                                                                                                                                                                                                                                                                                                              hero1 = new Hero(1,'1111');
$hero3 = new Hero(3,'3333');
$hero2 = new Hero(2,'2222');
Hero:: addHero($head,$hero1);
Hero::addHero($head,$hero3);
Hero::addHero($head,$hero2);
Hero::showHero($head) ;
Hero::delHero($head,2);
Hero::showHero($head);
?>






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