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@ 2018-05-05T23:56:47Z

<?php
    class Stack
    {
        public $maxSize;
        public $items = [];
        public $top = 0;


        public function __construct(array $stack, $maxSize){
            $this->items = $stack;
            $this->maxSize = $maxSize;
        }

        public function push($item){
            if ($this->top === $this->maxSize){
                throw new Exception("Stack overflow");
            }
            $this->items[$this->top] = $item;
            $this->top++;
        }

        public function pop(){
            if ($this->top === 0){
                throw new Exception("Stack underflow");
            }
            $this->top--;
            return $this->items[$this->top];
        }
    }
    
    $items = [1, 2, 3, 4, 5];
    $maxSize = 10;
    $stack = new Stack($items, $maxSize);
    $stack->push(6);
    var_dump($stack);
    
    $stack->pop();
    var_dump($stack);

Output for 7.1.0 - 7.1.33, 7.2.0 - 7.2.33, 7.3.0 - 7.3.33, 7.4.0 - 7.4.33, 8.0.0 - 8.0.30, 8.1.0 - 8.1.33, 8.2.0 - 8.2.29, 8.3.0 - 8.3.26, 8.4.1 - 8.4.13: object(Stack)#1 (3) { ["maxSize"]=> int(10) ["items"]=> array(5) { [0]=> int(6) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) } ["top"]=> int(1) } object(Stack)#1 (3) { ["maxSize"]=> int(10) ["items"]=> array(5) { [0]=> int(6) [1]=> int(2) [2]=> int(3) [3]=> int(4) [4]=> int(5) } ["top"]=> int(0) }

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181.33 ms | 408 KiB | 5 Q