php生成不重复随机字符串

2017-05-02 17:51:44

使用时间戳作为原始字符串，再随机生成五个字符随机插入任意位置，生成新的字符串，保证不重复

function myrand($len)
    {
        $chars='ABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789abcdefghijklmnopqrstuvwxyz';
        $string=time();
        for(;$len>=1;$len--)
        {
            $position=rand()%strlen($chars);
            $position2=rand()%strlen($string);
            $string=substr_replace($string,substr($chars,$position,1),$position2,0);
        }
        return $string;
    }


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