by ·2条评论

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/**
* 全局唯一id生产类
* https://segmentfault.com/a/1190000007769660
* 基于Twitter的SnowFlake算法改造
* twitter的结构：
* 64bit = 1bit为空缺 + 41bit毫秒时间戳 + 10bit机器id + 12bit自增id
* 当前结构 **** 最多支持128项业务
* 64bit = 1bit空缺 + 7bit业务编号(128项业务) + 39bit毫秒时间戳(与2017-06-01的差值) + 5bit机器id(32台) + 4bit一级随机数 + 4bit二级随机数 + 4bit三级随机数
*/
 
$machineid_file = "/data/machineid.txt";
if (file_exists($machineid_file)) {
    $machine_id = intval(file_get_contents($machineid_file));
    if ($machine_id > 31 || $machine_id < 0) {
        $machine_id = 0;
    }
} else {
    $machine_id = 0;
}
 
define('MACHINE_ID', $machine_id);
 
class BusinessIdHelper
{
 
    public static $start_stamp = 1496246400000; // 2017-06-01 00:00:00的毫秒级时间戳
    public static $max_rand = 15;
 
    public static function generateId($business_id)
    {
        // 1bit - 头部空缺
        $head_bin = str_pad(decbin(0), 1, "0", STR_PAD_LEFT);
 
        // 7bit - 7bit业务编号(最多128项业务)
        $business_id_bin = str_pad(decbin($business_id), 7, "0", STR_PAD_LEFT);
 
        // 39bit - (now - $start_stamp)的毫秒级时间戳差值
        $now_stamp = floor(microtime(true) * 1000);
        $diff_stamp_bin = str_pad(decbin($now_stamp - self::$start_stamp), 39, "0", STR_PAD_LEFT);
 
        // 5bit - 32台机器
        $machine_id_bin = str_pad(decbin(MACHINE_ID), 5, "0", STR_PAD_LEFT);
 
        // 4bit - 4位随机数(0 ~ 15)
        // 一级
        $random1 = mt_rand(0, self::$max_rand);
        $random1_bin = str_pad(decbin($random1), 4, "0", STR_PAD_LEFT);
        // 二级
        $random2 = mt_rand(0, self::$max_rand);
        $random2_bin = str_pad(decbin($random2), 4, "0", STR_PAD_LEFT);
        // 三级
        $random3 = mt_rand(0, self::$max_rand);
        $random3_bin = str_pad(decbin($random3), 4, "0", STR_PAD_LEFT);
 
        // 链接二进制串
        $pack_data = $head_bin . $business_id_bin . $diff_stamp_bin . $machine_id_bin . $random1_bin . $random2_bin . $random3_bin;
 
        /*
        var_dump($business_id);
        var_dump($now_stamp);
        var_dump(MACHINE_ID);
        var_dump($pid);
        var_dump($pack_data);
        */
 
        return bindec($pack_data);
    }
 
    public static function parseId($id)
    {
        // 数据不满64位的，需要补齐
        $data_bin = str_pad(decbin($id), 64, "0", STR_PAD_LEFT);
 
        $head_bin = substr($data_bin, 0, 1);
 
        $business_id_bin = substr($data_bin, 1, 7);
        $diff_stamp_bin = substr($data_bin, 8, 39);
        $machine_id_bin = substr($data_bin, 47, 5);
        $random1_bin = substr($data_bin, 52, 4);
        $random2_bin = substr($data_bin, 56, 4);
        $random3_bin = substr($data_bin, 60, 4);
 
        $head = bindec($head_bin);
        $business_id = bindec($business_id_bin);
        $diff_stamp = bindec($diff_stamp_bin);
        $machine_id = bindec($machine_id_bin);
        $random1 = bindec($random1_bin);
        $random2 = bindec($random2_bin);
        $random3 = bindec($random3_bin);
 
        $stamp = self::$start_stamp + $diff_stamp;  // 毫秒
 
        $data = [
            'head' => $head,
            'business_id' => $business_id,
            'stamp' => $stamp,  // 毫秒
            'machine_id' => $machine_id,
            'random1' => $random1,
            'random2' => $random2,
            'random3' => $random3,
        ];
 
        return $data;
    }
 
}

by ·一条评论

第一部分、十道海量数据处理面试题

　　1、海量日志数据，提取出某日访问百度次数最多的那个IP。

此题，在我之前的一篇文章算法里头有所提到，当时给出的方案是：IP的数目还是有限的，最多2^32个，所以可以考虑使用hash将ip直接存入内存，然后进行统计。

再详细介绍下此方案：首先是这一天，并且是访问百[……]

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by ·0评论

加密：

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function string_secret($string)
{
    $key = "yadgen";
 
    //密锁串，不能出现重复字符，内有A-Z,a-z,0-9,/,=,+,_,
    $lockstream = 'st=lDEFABCNOPyzghi_jQRST-UwxkVWXYZabcdef+IJK6/7nopqr89LMmGH012345uv';
    //随机找一个数字，并从密锁串中找到一个密锁值
    $lockLen = strlen($lockstream);
    $lockCount = rand(0,$lockLen-1);
    $randomLock = $lockstream[$lockCount];
    //结合随机密锁值生成MD5后的密码
    $password = md5($key.$randomLock);
    //开始对字符串加密
    $txtStream = base64_encode($string);
    $tmpStream = '';
    $i=0;$j=0;$k = 0;
    for ($i=0; $i<strlen($txtStream); $i++) {
        $k = ($k == strlen($password)) ? 0 : $k;
        $j = (strpos($lockstream,$txtStream[$i])+$lockCount+ord($password[$k]))%($lockLen);
        $tmpStream .= $lockstream[$j];
        $k++;
    }
    return $tmpStream.$randomLock;
}

解密：

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function secret_string($string)
{
    $key = "yadgen";
 
    //密锁串，不能出现重复字符，内有A-Z,a-z,0-9,/,=,+,_,
    $lockstream = 'st=lDEFABCNOPyzghi_jQRST-UwxkVWXYZabcdef+IJK6/7nopqr89LMmGH012345uv';
 
    $lockLen = strlen($lockstream);
    //获得字符串长度
    $txtLen = strlen($string);
    //截取随机密锁值
    $randomLock = $string[$txtLen - 1];
    //获得随机密码值的位置
    $lockCount = strpos($lockstream,$randomLock);
    //结合随机密锁值生成MD5后的密码
    $password = md5($key.$randomLock);
    //开始对字符串解密
    $txtStream = substr($string,0,$txtLen-1);
    $tmpStream = '';
    $i=0;$j=0;$k = 0;
    for($i=0; $i<strlen($txtStream); $i++){
        $k = ($k == strlen($password)) ? 0 : $k;
        $j = strpos($lockstream,$txtStream[$i]) - $lockCount - ord($password[$k]);
        while($j < 0){
            $j = $j + ($lockLen);
        }
        $tmpStream .= $lockstream[$j];
        $k++;
    }
    return base64_decode($tmpStream);
}

by ·0评论

Javascript 代码如下：

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function is_weixn(){
    var ua = navigator.userAgent.toLowerCase();
    if(ua.match(/MicroMessenger/i)=="micromessenger") {
        return true;
    } else {
        return false;
    }
}

PHP 代码如下：

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function is_weixin(){
    if ( strpos($_SERVER['HTTP_USER_AGENT'], 'MicroMessenger') !== false ) {
            return true;
    }  
    return false;
}

by ·0评论

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function tranTime($time) {
    $rtime = date("m-d H:i",$time);
    $rtime2 = date("Y-m-d H:i",$time);
    $htime = date("H:i",$time);
    $time = time() - $time;
    if ($time < 60) {
        $str = '刚刚';
    } elseif ($time < 60 * 60) {
        $min = floor($time/60);
        $str = $min.' 分钟前';
    } elseif ($time < 60 * 60 * 24) {
        $h = floor($time/(60*60));
        $str = $h.'小时前 '.$htime;
    } elseif ($time < 60 * 60 * 24 * 3) {
        $d = floor($time/(60*60*24));
        if($d==1)
           $str = '昨天 '.$htime;
        else
           $str = '前天 '.$htime;
    } elseif ($time < 60 * 60 * 24 * 7) {
        $d = floor($time/(60*60*24));
           $str = $d.' 天前 '.$htime;
    } elseif ($time < 60 * 60 * 24 * 30) {
        $str = $rtime;
    } else {
        $str = $rtime2;
    }
    return $str;
}
$w_time = time() - 3600;
$times = tranTime($w_time);
echo $times;

by ·0评论

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function get_week($year) {
    $year_start = $year . "-01-01";
    $year_end = $year . "-12-31";
    $startday = strtotime($year_start);
    if (intval(date('N', $startday)) != '1') {
        $startday = strtotime("next monday", strtotime($year_start)); //获取年第一周的日期
    }
    $year_mondy = date("Y-m-d", $startday); //获取年第一周的日期
    $endday = strtotime($year_end);
    if (intval(date('W', $endday)) == '7') {
        $endday = strtotime("last sunday", strtotime($year_end));
    }
    $num = intval(date('W', $endday));
    for ($i = 1; $i <= $num; $i++) {
        $j = $i -1;
        $start_date = date("Y-m-d", strtotime("$year_mondy $j week "));
        $end_day = date("Y-m-d", strtotime("$start_date +6 day"));
        $week_array[$i] = array (
            str_replace("-",
            ".",
            $start_date
        ), str_replace("-", ".", $end_day));
    }
    return $week_array;
}

函数get_week()通过传入参数$year年份，获取当年第一天和最后一天所在的周数，计算第一周的日期，通过循环获取每一周的第一天和最后一天的日期。最后返回是一个数组。
想得到指定周数的开始日期和结束日期，比如2011年第18周的[……]

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$time = time();
$first_day = strtotime(date('Y-m-01', $time));
$last_day = strtotime(date('Y-m-d', strtotime("$first_day +1 month -1 day")));

by ·4条评论

1. 确认站点主题
2. 打开目录wp-content/wp-content/themes/twentyeleven/footer.php
3. 注释或删除下面代码即可：

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<div id="site-generator">
<?php do_action( 'twentyeleven_credits' ); ?>
<a href="<?php echo esc_url( __( 'http://wordpress.org/', 'twentyeleven' ) ); ?>" title="<?php esc_attr_e( 'Semantic Personal Publishing Platform', 'twentyeleven' ); ?>"><?php printf( __( 'Proudly powered by %s', 'twentyeleven' ), 'WordPress' ); ?></a>
</div>