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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; $arr=array('gbw','michael','php','js'); //$node->getHeadCreateSLL($arr); //print_r($node->getAllElem()); $node->getTailCreateSLL($arr); echo $node->getElemForPos(2); $pos=$node->getElemPosition('gbw'); echo $pos; $node->getDeleteElem($pos); $node->getInsertElem(1,'gbw2'); print_r($node->getAllElem());
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