php实现数据结构线性表（顺序）

xiaoxiao2021-04-14 32

<?php class ArrayList{ private $list; private $size; public function __construct() { $this->list=array(); $this->size=0; } //初始化链表 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 ($this->size==0){ return true; }else{ return false; } } } //链表长度 public function lengthList(){ if (isset($this->list)){ return $this->size; }else{ return false; } } //取元素 public function getElem($i){ if ($i<1||$i>$this->size){ die('failed'); } if (isset($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>$this->size){ die('failed'); } if ($i==1){ die('no prior'); } 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){ die('failed'); } if ($i==$this->size){ die('no next'); } 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>$this->size){ die('failed'); } if (isset($this->list)&&is_array($this->list)){ if ($this->size==0){ $this->list[0]=$e; $this->size++; }else{ for($j=$this->size-1;$j>=$i;$j--){ $this->list[$j]=$this->list[$j-1]; } $this->list[$i-1]=$e; $this->size++; } } } //删除元素 public function deleteList($i){ if ($i<1||$i>$this->size){ die('failed'); } if (isset($this->list)&&is_array($this->list)){ if ($i==$this->size){ unset($this->list[$i-1]); }else{ unset($this->list[$i-1]); for ($j=$i;$j<$this->size;$j++){ $this->list[$j-1]=$this->list[$j]; } } $this->size--; } } //遍历 public function printList(){ if (isset($this->list)&&is_array($this->list)){ foreach ($this->list as $value) { echo $value.' '; } } } }

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