<?php

class Random{
	public static function uuid($whole = false){
		$id = strtolower(md5(uniqid(mt_rand(0, (double)microtime() * 1000000), true)));
		
		if($whole){
			$uuid = 
				substr($id, 0, 8)."-".
				substr($id, 8, 4)."-".
				substr($id, 12, 4)."-".
				substr($id, 16, 4)."-".
				substr($id, 20, 12)
			;
		}
		else
			$uuid = $id;
		
		return $uuid;
	}
	
	public static function num($len = 6){
		$nums = array(6, 8, 1, 7, 2, 5, 3, 9, 0, 4);
		
		if($len > 10) $len = 10;
		else if($len < 1) $len = 1;
		
		shuffle($nums);
		shuffle($nums);
		
		$num = implode("", $nums);
		$num = substr($num, 0, $len);
		
		return (string)$num;
	}
	
	public static function str(){
		$letters = array("d", "m", "q", "n", "t", "l", "s", "i", "b", "k", "u", "e", "h", "y", "x", "r", "w", "a", "p", 
			"g", "j", "v", "z", "c", "o", "f");
	}
}