PHP - String Reverse Using Stack Implementation, Php

PHP - String Reverse Using Stack Implementation

<?php //php 7.0.8

$string = "hello";
echo reverse($string);

class Stack {
    private $size;
    private $data;
    private $top;
    public function __construct($size) {        
        $this->size = $size;
        $this->data = array();
        $this->top = -1;
    }
    
    public function push($element) {        
        if ($this->top == ($this->size-1)) {
            throw new Exception("Error: Stack is full");
        }
        $this->data[++$this->top] = $element;        
    }
    
    public function pop() : string {
        if ($this->isempty()) {
            throw new Exception("Error: Stack is empty");
        }
        return $this->data[$this->top--];
    }
    
    public function top() : string {
        return $this->data[$this->top];
    }
    
    public function isempty() : bool {
        if ($this->top == -1)
            return true;
        
        return false;
    }
}
    
?>


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