antrian bank linklist

<?php
  class linklist{
    public $head,$tail,$id;
    function __construct(){
      $this->head=null;
      $this->tail=null;
      $this->id=0;
    }
    public function enque($a){
      $baru=new node();
      $baru->input($a);
      if($this->head==null) $this->head=$baru;
      else $this->tail->setNext($baru);
      $this->tail=$baru;
      $this->id++;
    }
    public function deque(){
      if($this->head!=null) $this->head=$this->head->getNext();
    }
    public function view(){
      if($this->head==null) echo"<div class='nomor col-3'> Empty </div>";
      else{
        $a=$this->head;
        $b=1;
        $c=11;
        while($a!=null){
          if($b<=$c) echo $a->read()." ";
          $b++;
          $a=$a->getNext();
        }
        if($b-1>$c) echo '<div class="nomor col-3"> <'.($b-$c-1).'> </div>';
      }
    }
  }
?>