Sharing of basic operation examples of PHP singly linked list

The first data structure is the linked list. The linked list is divided into two types of sequential chains with direct array forms. We will not discuss here. Array_push() and array_pop() functions can basically meet daily needs. This article mainly discusses Let's share the basic operation examples of PHP singly linked list, I hope it can help everyone.

<?php
 
/**
 *@author:gongbangwei(18829212319@163.com)
 *@version:1.0
 *@date:2016-05-22
 *单链表的基本操作
 *1.初始化单链表 __construct()
 *2.清空单链表 clearSLL()
 *3.返回单链表长度 getLength()
 *4.判断单链表是否为空 getIsEmpty()
 *5.头插入法建表 getHeadCreateSLL()
 *6.尾插入法建表 getTailCreateSLL()
 *7.返回第$i个元素 getElemForPos()
 *8.查找单链表中是否存在某个值的元素 getElemIsExist()
 *9.单链表的插入操作 getInsertElem()
 *10.遍历单链表中的所有元素 getAllElem()
 *11.删除单链中第$i个元素 getDeleteElem()
 *12.删除单链表所有重复的值 getElemUnique()
 **/
 header("content-type:text/html;charset=UTF-8");
 class LNode{
    public $mElem;
    public $mNext;
    public function __construct(){
        $this->mElem=null;
        $this->mNext=null;
    }
}
class SingleLinkedList{
     //头结点数据
    public $mElem;
    //下一结点指针
    public $mNext;
    //单链表长度
    public static $mLength=0;
    public function __construct(){
        $this->mElem=null;
        $this->mNext=null;
    }
    //返回单链表长度
      public static function getLength(){
          return self::$mLength;
    }
      public function getIsEmpty(){
          if(self::$mLength==0 && $this->mNext==null){
              return true;
          }
          else{
              return false;
          }
      }
      public function clearSLL(){
             if(self::$mLength>0){
                while($this->mNext!=null){
                        $q=$this->mNext->mNext;
                        $this->mNext=null;
                        unset($this->mNext);
                        $this->mNext=$q;
               }
           self::$mLength=0;
        }
    }
    public function getHeadCreateSLL($sarr){
        $this->clearSLL();
 
        if(is_array($sarr) and count($sarr)>0){
            foreach ($sarr as $key => $value) {
                $p= new LNode;
                $p->mElem=$value;
                $p->mNext=$this->mNext;
                $this->mNext=$p;
                self::$mLength++;
            }
        }
        else{
            return false;
        }
        return true;
    }
     public function getTailCreateSLL($sarr){
        $this->clearSLL();
 
        if(is_array($sarr) and count($sarr)>0){
                $q=$this;
                foreach($sarr as $value){
                        $p=new LNode;
                        $p->mElem=$value;
                        $p->mNext=$q->mNext;
                        $q->mNext=$p;
                        $q=$p;
                        self::$mLength++;
               }
        }
        else{
                return false;
        }
    }
     public function getElemForPos($i){
         if(is_numeric($i) && $i<self::$mLength && $i>0){
             $p=$this->mNext;
             for ($j=1; $j < $i ; $j++) {
                 $q=$p->mNext;
                 $p=$q;
             }
             return $p->mElem;
         }
         else{
             return null;
         }
     }
      public function getElemIsExist($value){
          if($value){
              $p=$this;
              while($p->mNext!=null and $p->mElem!=value){
                  $q=$p->mNext;
                 $p=$q;
              }
              if($p->mElem==value){
                  return true;
              }
              else{
                  return false;
              }
          }
      }
      public function getElemPosition($value){
          if($value){
              $p=$this;
              $pos=0;
              while($p->mNext!=null and $p->mElem!=$value){
                  $q=$p->mNext;
                 $p=$q;
                 $pos++;
              }
              if($p->mElem==$value){
                  return $pos;
              }
              else{
                  return -1;
              }
          }
      }
           /*单链表的插入操作
     *
     *@param int $i 插入元素的位序，即在什么位置插入新的元素,从1开始
     *@param mixed $e 插入的新的元素值
     *@return boolean 插入成功返回true，失败返回false
     */
           public function getInsertElem($i,$e){
               if($i<self::$mLength){
                   $j=1;
                   $p=$this;
               }
               else{
                   return false;
               }
               while($p->mNext!=null and $j<$i){
                   $q=$p->mNext;
                 $p=$q;
                 $j++;
               }
               $q=new LNode;
               $q->mElem=$e;
               $q->mNext=$p->mNext;
               $p->mNext=$q;
               self::$mLength++;
               return true;
           }
      /**
     *删除单链中第$i个元素
     *@param int $i 元素位序
     *@return boolean 删除成功返回true,失败返回false
     */
    public function getDeleteElem($i){
        if($i>self::$mLength || $i<1){
                return false;
            }
            else{
                $p=$this;
                $j=1;
                while($j<$i){
                    $p=$p->mNext;
                    $j++;
                }
                $q=$p->mNext;
                $p->mNext=$q->mNext;
                unset($q);
                self::$mLength--;
                return true;
            }
    }
     public function getAllElem(){
         $all=array();
         if(!$this->getIsEmpty()){
             $p=$this->mNext;
             while($p->mNext){
                 $all[]=$p->mElem;
                 $p=$p->mNext;
             }
             if($p->mElem)
                 $all[]=$p->mElem;
             return $all;
         }
     }
     public function getElemUnique(){
            if(!$this->getIsEmpty()){
                $p=$this;
                while($p->mNext!=null){
                        $q=$p->mNext;
                        $ptr=$p;
                        while($q->mNext!=null){
                                if(strcmp($p->mElem,$q->mElem)===0){
                                    $ptr->mNext=$q->mNext;
                                    $q->mNext=null;
                                    unset($q->mNext);
                                    $q=$ptr->mNext;
                                    self::$mLength--;
                                }
                                else{
                                    $ptr=$q;
                                    $q=$q->mNext;
                                }
                      }
                      //处理最后一个元素
                   if(strcmp($p->mElem,$q->mElem)===0){
                                $ptr->mNext=null;
                                self::$mLength--;
                        }
                        $p=$p->mNext;
                }//end of while
            }   
    }
}
 
///////////////test//////////
$node=new SingleLinkedList;
$arr=array(&#39;gbw&#39;,&#39;michael&#39;,&#39;php&#39;,&#39;js&#39;);
//$node->getHeadCreateSLL($arr);
//print_r($node->getAllElem());
$node->getTailCreateSLL($arr);
echo $node->getElemForPos(2);
$pos=$node->getElemPosition(&#39;gbw&#39;);
echo $pos;
$node->getDeleteElem($pos);
$node->getInsertElem(1,&#39;gbw2&#39;);
print_r($node->getAllElem());

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