/libs/system/RandomKey.php

<?php

class RandomKey

{

    function getChineseCharacter()

    {

        $unidec = rand(19968, 24869);

        $unichr = '&#' . $unidec . ';';

        $zhcnchr = mb_convert_encoding($unichr, "UTF-8", "HTML-ENTITIES");

        return $zhcnchr;

    }

    /**

     * 随机生成一个字符串

     * @param $length

     * @param $number

     * @param $not_o0

     * @return unknown_type

     */

    static function string($length=8,$number=true,$not_o0=false)

    {

        $strings = 'ABCDEFGHIJKLOMNOPQRSTUVWXYZ';  //字符池

        $numbers = '0123456789';                    //数字池

        if($not_o0)

        {

            $strings = str_replace('O','',$strings);

            $numbers = str_replace('0','',$numbers);

        }

        $pattern = $strings.$number;

        $max = strlen($pattern)-1;

        $key = '';

        for($i=0;$i<$length;$i++)

        {

            $key .= $pattern{mt_rand(0,$max)};    //生成php随机数

        }

        return $key;

    }

    /**

     * 按ID计算散列

     * @param $uid

     * @param $base

     * @return unknown_type

     */

    static function idhash($uid,$base=1000)

    {

        return intval($uid/$base);

    }

    /**

     * 按UNIX时间戳产生随机数

     * @param $length

     * @return unknown_type

     */

    static function randtime($rand_length=6)

    {

        list($usec, $sec) = explode(" ", microtime());

        $min = intval('1'.str_repeat('0',$rand_length-1));

        $max = intval(str_repeat('9',$rand_length));

        return substr($sec,-5).((int)$usec*100).rand($min,$max);

    }

    /**

     * 产生一个随机MD5字符的一部分

     * @param $length

     * @param $seed

     * @return unknown_type

     */

    static function randmd5($length=8,$seed=null)

    {

        if(empty($seed)) $seed = self::string(16);

        return substr(md5($seed.rand(111111,999999)),0,$length);

    }

}

?>