PHP data structure and sequential linked list, detailed explanation of the use of linked linear list

This time I will bring you a detailed explanation of the use of PHP data structure and sequential linked list linked linear list. What are the precautions for PHP data structure and sequential linked list linked linear list? The following is a practical case. Get up and take a look.

Linked list operation

1. InitList(L): Initialize the linked list

2. DestroyList(L): Delete the connection
3. ClearList(L): Clear the linked list
4. ListEmpty(L): Determine whether it is empty
5. ListLength(L): The length of the linked list
6. getElem(L,i): Remove the element
7. LocateElem(L,e): Determine whether e is in the linked list
8. PriorElem(L,i): predecessor
9. NextElem(L,i): successor
10. ListInsert( L,i,e): Insert element
11. ListDelete(L,i,): Delete element

Sequential linked list operation

<?php
class ArrayList{
  private $list;
  private $size;
  //构造函数
  public function construct(){
   $this->list=array();
   $this->size=0;
  }
  public function initList(){
   $this->list=array();
   $this->size=0;
  }
  //删除链表
  public function destoryList(){
   if(isset($this->list)){
     unset($this->list);
    $this->size=0;
   }
  }
  //清空链表
  public function clearList(){
   if(isset($this->list)){
    unset($this->list);
   }
   $this->list=array();
   $this->size=0;
  }
  //判断链表是否为空
  public function emptyList(){
   if(isset($this->list)){
     if($this->size=0)
      return TRUE;
    else
     return FALSE;
   }
  }
  //链表长度
  public function lenghtList(){
   if(isset($this->list)){
    return $this->size;
   }
  }
  //取元素
  public function getElem($i){
   if($i<1||$i>$this->size){
    echo "溢出<br>";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    return $this->list[$i-1];
   }
  }
  //是否在链表中
  public function locateElem($e){
   if(isset($this->list)&&is_array($this->list)){
    for($i=0;$i<$this->size;$i++){
      if($this->list[$i]==$e){
       return $i+1;
      }
    }
    return 0;
   }
  }
  //前驱
  public function priorElem($i){
   if($i<1||$i>$this->size){
    echo "溢出";
    exit();
   }
   if($i==1){
    echo "没有前驱";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    return $this->list[$i-2];
   }
  }
  //后继
  public function nextElem($i){
   if($i<1||$i>$this->size){
    echo "溢出";
    exit();
   }
   if($i==$this->size){
    echo "没有后继";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    return $this->list[$i];
   }
  }
  //插入元素
  public function insertList($i,$e){
   if($i<1||$i>$this->size+1){
    echo "插入元素位置有误";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    if($this->size==0){
      $this->list[$this->size]=$e;
      $this->size++;
    }else{
      $this->size++;
      for($j=$this->size-1;$j>=$i;$j--){
       $this->list[$j]=$this->list[$j-1];
      }
      $this->list[$i-1]=$e;
    }
   }
  }
  //删除元素
  public function deleteLlist($i){
   if($i<1||$i>$this->size){
    echo "删除元素位置有误";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    if($i==$this->size){
      unset($this->list[$this->size-1]);
    }else{
      for($j=$i;$j<$this->size;$j++){
       $this->list[$j-1]=$this->list[$j];
      }
      unset($this->list[$this->size-1]);
     }
   $this->size--;
   }
  }
  //遍历
  public function printList(){
   if(isset($this->list)&&is_array($this->list)){
    foreach ($this->list as $value){
      echo $value." ";
    }
    echo "<br>";
   }
  }
}
?>

Linked Linear Table

<?php
class LinkList {
  private $head;
  private $size;
  private $list;
  public function construct(){
   $this->head="";
   $this->size=0;
   $this->list=array();
  }
  public function initList(){
   $this->head="";
   $this->size=0;
   $this->list=array();
  }
  //删除链表
  public function destoryList(){
   if(isset($this->list)&&isset($this->head)){
    unset($this->list);
    unset($this->head);
   }
  }
  //清空链表
  public function clearList(){
   if(isset($this->list)){
    unset($this->list);
   }
   $this->list=array();
   $this->size=0;
   $this->head="";
  }
  //判断链表是否为空
  public function emptyList(){
   if(isset($this->list)){
    if($this->size==0)
      returnTRUE;
    else
      returnFALSE;
   }
  }
  //链表长度
  public function lenghtList(){
   if(isset($this->list)){
    return$this->size;
   }
  }
  //取元素
  public function getElem($i){
   if($i<1||$i>$this->size){
    echo "溢出<br>";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    $j=1;
    //头指针
    $tmp=$this->head;
    while($i>$j){
      if($this->list[$tmp]['next']!=null){
       $tmp=$this->list[$tmp]['next'];
       $j++;
      }
    }
    return  $this->list[$tmp]['data'];
   }
  }
  //是否在链表中
  public function locateElem($e){
   if(isset($this->list)&&is_array($this->list)){
    $tmp=$this->head;
    while($this->list[$tmp]['data']!=$e){
      if($this->list[$tmp]['next']!=null){
       $tmp=$this->list[$tmp]['next'];
      }else{
       returnFALSE;
      }
    }
    return TRUE;
   }
  }
  //前驱
  public function priorElem($i){
   if($i<1||$i>=$this->size){
    echo "溢出";
    exit();
   }
   if($i==1){
    echo "没有前驱";
    exit();
   }
   $tmp=$this->head;
   $j=1;
   while($i>$j+1){
    if($this->list[$tmp]['next']!=null){
      $j++;
      $tmp=$this->list[$tmp]['next'];
    }
   }
   return$this->list[$tmp]['data'];
  }
  //后继
  public function nextElem($i){
   if($i<1||$i>$this->size){
    echo "溢出";
    exit();
   }
   if($i==$this->size){
    echo "没有后继";
    exit();
   }
   $j=1;
   $tmp=$this->head;
   while($i>=$j){
    if($this->list[$tmp]['next']!=null){
      $j++;
      $tmp=$this->list[$tmp]['next'];
    }
   }
   return$this->list[$tmp]['data'];
  }
  //插入元素:后插法
  public function insertList($i,$e){
   if(isset($this->list)&&is_array($this->list)){
    //空表
    if($this->size==0){
      $this->head=$this->uuid();
      $this->list[$this->head]['data']=$e;
      $this->list[$this->head]['next']=NULL;
      $this->size++;
    }else{
      if($i<1||$i>$this->size){
      echo"插入元素位置有误";
      exit();
      }
      $j=1;
      $tmp=$this->head;
      while($i>$j){
       if($this->list[$tmp]['next']!=null){
         $j++;
         $tmp=$this->list[$tmp]['next'];
       }
      }
      $find=$tmp;
      $id=$this->uuid();
      if($this->list[$find]['next']==null){
       //尾部
       $this->list[$find]['next']=$id;
       $this->list[$id]['data']=$e;
       $this->list[$id]['next']=null;
       $this->size++;
      }else{
       //中间
       $this->list[$id]['next']=$this->list[$find]['next'];
       $this->list[$find]['next']=$id;
       $this->list[$id]['data']=$e;
       $this->size++;
      }
    }
   }
  }
  //删除元素
  public function deleteLlist($i){
   if($i<1||$i>$this->size){
    echo "删除元素位置有误";
    exit();
   }
   if(isset($this->list)&&is_array($this->list)){
    if($i==1){
      //删除头元素
      $this->head=$this->list[$this->head]['next'];
    }else{
      $tmp=$this->head;
      $j=1;
      while($i>$j+1){
       if($this->list[$tmp]['next']!=null){
         $j++;
         $tmp=$this->list[$tmp]['next'];
       }
      }
      //找到删除元素的前驱
      $find=$tmp;
      //删除的元素
      if($this->list[$find]['next']!=null){
       //不是最后一个元素
       $delete=$this->list[$find]['next'];
       $this->list[$find]['next']=$this->list[$delete]['next'];
      }else{
       $this->list[$tmp]['next']=null;
      }
    }
   }
  }
  public function traverstList(){
   $tmp=$this->head;
   while($this->list[$tmp]['next']!=NULL){
    $this->printList($this->list[$tmp]['data'],TRUE);
    $tmp=$this->list[$tmp]['next'];
   }
   $this->printList($this->list[$tmp]['data'],FALSE);
  }
  public function printList($str,$flag){
   if($flag){
    echo$str."->";
   }else {
    echo$str."<br>";
   }
  }
  //uuid 唯一码
  public  function uuid($prefix = '') {
  $chars =md5(uniqid(mt_rand(), true));
  $uuid = substr($chars,0,8) . '-';
  $uuid .=substr($chars,8,4) . '-';
  $uuid .=substr($chars,12,4) . '-';
  $uuid .=substr($chars,16,4) . '-';
  $uuid .= substr($chars,20,12);
  return $prefix. $uuid;
  }
}
?>

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

Recommended reading:

How to deal with localhost being unavailable after win10 apache configures the virtual host

Steps to temporarily convert WeChat recording to permanent storage using PHP Detailed explanation

The above is the detailed content of PHP data structure and sequential linked list, detailed explanation of the use of linked linear list. For more information, please follow other related articles on the PHP Chinese website!