栈和队列的实现（PHP）

<?php

 class Stack{
     public static $dataInfo =  array();
     public static $theMax= 10;
     public static $length=0;
    // public static $stackInfo;

     public function addData($data){
         if(self::$length >= self::$theMax){
             return false;
         }else{
           array_push(self::$dataInfo,$data);
           self::$length ++; 
         }
         
     }
     public function outData(){
         if(self::$length<=0 ){
             
             return false;
         }else{
            $data = array_pop(self::$dataInfo);
            self::$length --;
             return $data;
         }
         
         
     }
     
     public function getAll(){
         foreach (self::$dataInfo as $value) {
             // code..
             print_r($value);
         }
     }
     
 }
$a = new Stack();
$a->addData(1);
$a->addData(3);
$a->addData(5);
$a->getAll();
print_r($a->outData());


?>