【PHP】生成邀请码

author：咔咔

wechat：fangkangfk

dechex将10进制转换为16进制

microtime返回微秒数

function create_code()
    {
        $code = 'abcdefghijklmnopqrstuvwxyz';
        $rand = $code[rand(0,25)]
            . strtoupper(dechex(date('m')))
            . date('d') . substr(time(),-5)
            . substr(microtime(),2,5)
            . sprintf('%02d',rand(0,99));
        for (
            $a = md5($rand,true),$s = '0123456789abcdefghijklmnopqrstuvwxyz',$d = '',$f = 0;
            $f < 5;
            $g = ord($a[$f]),$d .= $s[($g ^ ord($a[$f + 8])) - $g & 0x1F],$f++
        ) ;
        return $d;
    }