class.ilDclStack.php

Go to the documentation of this file.

<?php
 
class ilDclStack
{
    protected array $stack = array();
 
    public function push($elem)
    {
        $this->stack[] = $elem;
    }
 
    public function pop()
    {
        if (!$this->isEmpty()) {
            $last_index = count($this->stack) - 1;
            $elem = $this->stack[$last_index];
            unset($this->stack[$last_index]);
            $this->stack = array_values($this->stack); // re-index
 
            return $elem;
        }
 
        return null;
    }
 
    public function top()
    {
        if (!$this->isEmpty()) {
            return $this->stack[count($this->stack) - 1];
        }
 
        return null;
    }
 
    public function isEmpty(): bool
    {
        return !(bool) count($this->stack);
    }
 
    public function reset(): void
    {
        $this->stack = array();
    }
 
    public function count(): int
    {
        return count($this->stack);
    }
 
    public function debug(): void
    {
        echo "<pre>" . print_r($this->stack, 1) . "</pre>";
    }
}