@Blog

        function updateCountdown() {
            const now = new Date();
            const nextNewYear = new Date(now.getFullYear() + 1, 0, 1, 0, 0, 0); // 次の年の1月1日0時0分0秒
            const diff = nextNewYear - now; // ミリ秒差

            if (diff > 0) {
                const days = Math.floor(diff / (1000 * 60 * 60 * 24));
                const hours = Math.floor((diff % (1000 * 60 * 60 * 24)) / (1000 * 60 * 60));
                const minutes = Math.floor((diff % (1000 * 60 * 60)) / (1000 * 60));
                const seconds = Math.floor((diff % (1000 * 60)) / 1000);

                // 表示を更新
                document.getElementById("countdown").innerText =
                    kanji(`${days}日 ${hours}時間 ${minutes}分 ${seconds}秒`);
            } else {
                document.getElementById("countdown").innerText = "明けましておめでとうございます！";
            }
        }

        // 初回呼び出しと1秒ごとの更新
        updateCountdown();
        setInterval(updateCountdown, 1000);
        function kanji(str){
            let oo = [{'kanji':'零'},{'kanji':'壱'},{'kanji':'弐'},{'kanji':'参'},{'kanji':'肆'},{'kanji':'伍'},{'kanji':'陸'},{'kanji':'漆'},{'kanji':'捌'},{'kanji':'玖'}];
            oo.forEach((o,index)=>{
                str = str.replace(new RegExp(index, "g"),o.kanji);
            });
            return str;
        }

// db.php: データベース接続の設定
function getDbConnection() {
    $host = 'localhost';
    $dbname = 'your_database';
    $username = 'your_username';
    $password = 'your_password';

    try {
        $pdo = new PDO("mysql:host=$host;dbname=$dbname", $username, $password);
        $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
        return $pdo;
    } catch (PDOException $e) {
        die("DB接続エラー: " . $e->getMessage());
    }
}

// endpoint_register.php: エンドポイントをデータベースに登録
if ($_SERVER['REQUEST_METHOD'] === 'POST') {
    $endpoint = $_POST['endpoint'];
    $auth = $_POST['auth'];
    $p256dh = $_POST['p256dh'];

    if ($endpoint && $auth && $p256dh) {
        $pdo = getDbConnection();
        $stmt = $pdo->prepare("INSERT INTO push_subscriptions (endpoint, auth, p256dh) VALUES (?, ?, ?)");
        $stmt->execute([$endpoint, $auth, $p256dh]);
        echo "登録成功";
    } else {
        echo "エンドポイントデータが不完全です";
    }
}

composer require minishlink/web-push

// message_send.php: データベースからエンドポイントを取得し、プッシュ通知を送信
require 'db.php';
require 'vendor/autoload.php';

use Minishlink\WebPush\WebPush;
use Minishlink\WebPush\Subscription;

// VAPIDキーの設定
$auth = [
    'VAPID' => [
        'subject' => 'https://example.com',
        'publicKey' => 'YOUR_PUBLIC_VAPID_KEY',
        'privateKey' => 'YOUR_PRIVATE_VAPID_KEY',
    ],
];

$webPush = new WebPush($auth);

// データベースからサブスクリプション情報を取得
$pdo = getDbConnection();
$stmt = $pdo->query("SELECT endpoint, auth, p256dh FROM push_subscriptions");
$subscriptions = $stmt->fetchAll(PDO::FETCH_ASSOC);

foreach ($subscriptions as $sub) {
    $subscription = Subscription::create([
        'endpoint' => $sub['endpoint'],
        'publicKey' => $sub['p256dh'],
        'authToken' => $sub['auth'],
    ]);

    // 送信するメッセージ
    $message = json_encode(['title' => '通知タイトル', 'body' => 'メッセージ内容']);

    // プッシュ通知の送信
    $webPush->sendOneNotification($subscription, $message);
}

<?php
namespace App\Events;

use Illuminate\Broadcasting\InteractsWithSockets;
use Illuminate\Foundation\Events\Dispatchable;
use Illuminate\Queue\SerializesModels;
use Illuminate\Broadcasting\PrivateChannel;
use Illuminate\Broadcasting\Channel;
use Illuminate\Contracts\Broadcasting\ShouldBroadcast;

class NotificationEvent implements ShouldBroadcast
{
    use Dispatchable, InteractsWithSockets, SerializesModels;

    public $title;
    public $message;
    public $userId;

    public function __construct($title, $message,$userId='')
    {
        $this->title = $title;
        $this->message = $message;
        $this->userId = $userId;
    }

    public function broadcastOn()
    {
        return new Channel('notifications.' . $this->userId);
    }

    public function broadcastAs()
    {
        return 'notification-event';
    }
}

<?php
$html = file_get_contents("高知県のダム貯水率のURL");
$html = mb_convert_encoding($html,"UTF-8","SJIS");
$dom = new DOMDocument();
$html = mb_convert_encoding($html, "HTML-ENTITIES", 'UTF-8');
@$dom->loadHTML($html,LIBXML_HTML_NOIMPLIED | LIBXML_HTML_NODEFDTD);
$xpath = new DOMXPath($dom);
$ary=array(
    "永瀬ダム"=>"nagase",
    "鎌井谷ダム"=>"kamaidani",
    "鏡ダム"=>"kagami",
    "早明浦ダム"=>"sameura",
    "桐見ダム"=>"kirimi",
    "坂本ダム"=>"sakamoto",
    "大渡ダム"=>"oodo",
    "中筋川ダム"=>"nakasugawa",
    "以布利川ダム"=>"iburigawa"
);
for($i=1;$i<=9;$i++){
    $r[$xpath->query("/html/body/form/div[2]/table/tbody/tr[$i]/td[3]")->item(0)->textContent] = preg_replace("/[\x{00a0}|?]/u","",$xpath->query("/html/body/form/div[2]/table/tbody/tr[$i]/td[7]")->item(0)->textContent);
}
foreach ($r as $key => $value) {
    $obj[$ary[$key]] = $value;
}
//echo '{"nagase":"91.16","kamaidani":"77.57","kagami":"39.32","sameura":"100.00","kirimi":"46.09","sakamoto":"99.38","oodo":"98.70","nakasugawa":"77.90","iburigawa":"99.12"}';
print json_encode($obj);

### mysql case = if文みたいなもの
```sql
select namae,tensu
case when (tensu >= 75 and tensu <= 80)  then '可'
when (tensu >= 25 and tensu < 75)  then '否' else '???' end as kahi
from tbl;

table name tbl
|namae|tensu|
|---|---|
|hirose|77|
|non|76|
|arimura|78|
|aragaki|80|

### support mysql>8.0.2 ウィンドウ関数
```sql
select id,namae, rank() over(order by code_total asc)as code_rank from code_data;
```
### code_data
|id|namae|code_total|
|---|---|---|
|1|kaonashi|15|
|2|mononoke|75|
|3|asitaka|52|
|4|san|87|
|5|theta|99|

rtcwake -m mem -s 3600
rtcwake -m disk -s 3600
rtcwake -m mem -t $(date +%s -d "2015-11-18 06:30")