Context.php

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<?php
namespace Elgg;

final class Context {
    
    private $stack = array();
    
    public function peek() {
        $topPos = count($this->stack) - 1;
        
        if ($topPos >= 0) {
            return $this->stack[$topPos];
        } else {
            return NULL;
        }

    }
    
    public function push($context) {
        array_push($this->stack, $context);
    }
    
    public function pop() {
        return array_pop($this->stack);
    }
    
    public function set($context) {
        $context = trim($context);

        if (empty($context)) {
            return false;
        }

        $context = strtolower($context);

        $this->pop();
        $this->push($context);

        return true;
    }

    public function contains($context) {
        return in_array($context, $this->stack);
    }
}