A comprehensive and detailed explanation of how PHP implements stack data structure examples

This article mainly introduces the stack data structure implemented by PHP, and analyzes the PHP definition stack and related operation skills such as stacking, popping, and traversing the stack in the form of examples. Friends who need it can refer to it. I hope it can help everyone.

Using PHP object-oriented thinking, the attributes of the stack include top, maximum storage number, and storage container (php array is used here).

The code is as follows: Several methods of pushing, popping, and traversing the stack are implemented:

<?php
class Stack{
  const MAXSIZE = 4;// 栈最大容量
  private $top = -1;
  private $stack = array();// 利用数组存储数据
  public function __construct(){
    $this->stack = array();
  }
  // 入栈
  public function push($ele){
    if ($this->top >= self::MAXSIZE-1){
      echo &#39;stack is full...&#39;;
      return false;
    }
    $this->stack[++$this->top] = $ele;// 此处必须是++i，先计算再使用
  }
  // 出栈，返回出栈元素
  public function pop(){
    if ($this->top == -1){
      echo &#39;stack is empty...&#39;;
      return false;
    }
    $ele = $this->stack[$this->top];
    unset($this->stack[$this->top--]);// 此处必须是i--，先使用再计算（注意出栈和入栈的区别）
    return $ele;
  }
  // 遍历栈
  public function show(){
    if ($this->top == -1){
      echo &#39;stack is empty...&#39;;
      return false;
    }
    for($i=$this->top; $i>-1; $i--){
      echo $this->stack[$i].&#39;<br/>&#39;;
    }
  }
}
$stack = new Stack;
$stack->push(1);
$stack->push(2);
$stack->push(3);
$stack->push(4);
//print_r($stack);
$stack->show();
$a = $stack->pop();
$a = $stack->pop();
$a = $stack->pop();
$stack->show();

Running results:

4
3
2
1
1
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