PHP dice roller class

dice.php

<?php


/**
 *  Simple game dice rolling
 *  Emulates probability as closely as possible
 *  Feel free to comment/contribute/bughunt
 *  
 * @author Matt Wiseman <trollboy@gmail.com>
*/
class roll {
 
 	/**
 	 *
 	 * Universal catcher for dice rolls
 	 * @param str name of the method called
 	 * @param array list of function arguments, although only 1 is supported
 	 * @return int result of dice roll
 	 *
 	*/
	public static function __callStatic ($dice, $args){

		//dice name
		$dice = strtolower($dice);

		//QTY
		$qty = intval($args[0]);


		//by default this is going to be 1, the lowest possible roll to make, however d100 is a special case
		$lowerlimit = 1;

		// total of dice rolled
		$result = 0;

		switch ($dice) {
			case 'd4':
				$upperlimit = 4;
				break;
			case 'd6':
				$upperlimit = 6;
				break;
			case 'd8':
				$upperlimit = 8;
				break;
			case 'd10': 
				$upperlimit = 10;
				break;
			case 'd12':
				$upperlimit = 12;
				break;
			case 'd20':
				$upperlimit = 20;
				break;
			case 'd30':
				$upperlimit = 30;
				break;
			case 'd100':
				$lowerlimit = 0;
				$upperlimit = 9;
				break;
			
			//no idea wtf you're trying to roll, so here's a 0 so you at least get an int back
			default:
				return $result;
				break;
		}
		$i = 0;
		while($i < $qty){
			if($dice == 'd100'){
				$preroll =  intval( mt_rand($lowerlimit,$upperlimit) .  mt_rand($lowerlimit,$upperlimit) );
				// on a roll of double 0, assume 100
				if(!$preroll){
					$result += 100;
				} else {
					$result += $preroll;
				}
			} else { 
				$result += mt_rand($lowerlimit,$upperlimit); 
			}
			$i++;
		}
		return $result;
	}   
}

 
var_dump(
	'3d6',
	roll::d6(3)
);

var_dump(
	'2d4',
	roll::d4(2)
);

var_dump(
	'1d100',
	roll::d100(1)
);	

dunno why I left the __construct in there.

removed the __construct, included phpDoc comments, and fixed double 0 case error