php 彩票类 lottery

<?php

 /*
 * For the full copyright and license information, please view the LICENSE
 * file that was distributed with this source code.
 */

 /**
 * Lottery class
 *
 * @author      Rafal Strojek <strojek.rafal@gmail.com>
 * @copyright   2014 (c) Rafal Strojek
 * @version     0.1
 */

class Lottery
{
    /**
     * Default parameters
     */
    private $params = array();
    
    /**
     * Numbers to drawn
     */
    private $numbers = array();
    
    /**
     * Constructor
     *
     * @param   array  $params  User-defined parameters
     */
    public function __construct($params = array())
    {
        $this->params = array_merge($this->getDefaultParameters(),$params);
        $this->numbers = range($this->params['from'], $this->params['to'], 1);
        
        $this->seedRand();
    }
    
    /**
     * Gets default parameters
     *
     * @return  array  Default Parameters
     */
    public function getDefaultParameters()
    {
        return array(
            'from' => 1, 
            'to' => 49,
            'numbers' => 6,
            'seed' => (int) ((float) microtime() * 1000000),
            'pow' => pow(2,24),
        );
    }
    
    /**
     * Gets parameters
     *
     * @return  array  Lottery parameters
     */
    public function getParameters()
    {
        return $this->params;
    }
    
    public function getSeed()
    {
        return (int) $this->params['seed'];
    }
    
    private function setSeed($seed = null)
    {
        $this->params['seed'] = ($seed) ? $seed : $this->makeSeed();

        // Return instance to shortcut
        return $this;
    }
    
    private function seedRand()
    {
        mt_srand($this->getSeed());
    }
    
    private function makeSeed()
    {
        return (int) ((mt_rand() + ((float) microtime() * 1000000)) % $this->params['pow']);
    }
    
    public function createTicket()
    {
        $ticket = array();
        $array = $this->numbers;
        
        for($i = 0; $i < $this->params['numbers']; $i++)
        {
            $this->setSeed()->seedRand();
            $key = mt_rand(0, (count($array) - 1));
            
            $ticket[$i] = $array[$key];
            array_splice($array, $key, 1);
        }
        
        asort($ticket);
        
        return $ticket;
    }
    
    public function createTickets($count = null)
    {
        if($count <= 0)
        {
            return array();
        }
        
        $count = min(500, max(1, $count));
        $tickets = array();
        for($i = 0; $i < $count; $i++)
        {
            $tickets[$i] = $this->createTicket();
        }
        
        return $tickets;
        
    }
}