ForLoop.php.md

class ForLoop
{
    private $from;
    private $to;
    private $vars = [];

    function init()
    {
        $args = func_get_args();
        foreach ($args as $arg) {
            if (is_array($arg)) {
                $key = key($arg);
                $value = current($arg);
                $this->vars[$key] = $value;
            } else {
                $this->vars[$arg] = null;
            }
        }
        return $this;
    }

    function from($from)
    {
        $this->from = $from;
        return $this;
    }

    function to($to)
    {
        $this->to = $to;
        return $this;
    }

    public function loop($callback)
    {
        $callback = $callback->bindTo($this);
        for ($i = $this->from; $i <= $this->to; $i++) {
            $callback($i);
        }
    }

    function __set($name, $value)
    {
        if (!array_key_exists($name, $this->vars)) {
            throw new Exception("Invalid property: $name");
        }
        $this->vars[$name] = $value;
    }

    function __get($name)
    {
        if ($this->vars[$name]) {
            return $this->vars[$name];
        }
        throw new Exception("Invalid property: " . $property);
    }
}

$for = new ForLoop();
$for->init("x", ["y" => 200], ["foo" => "default value"])
     ->from(1)
     ->to(10)
     ->loop(function ($index) {
         $this->x = 100;
         echo $index + $this->x + $this->y, "\r\n";
     });