<?php
// public_html/buscar-apus/app/Db.php
final class Db {
  private static ?PDO $pdo = null;

  public static function pdo(array $cfg): PDO {
    if (!self::$pdo) {
      $dsn = "mysql:host={$cfg['db']['host']};dbname={$cfg['db']['name']};charset=utf8mb4";
      self::$pdo = new PDO($dsn, $cfg['db']['user'], $cfg['db']['pass'], [
        PDO::ATTR_ERRMODE            => PDO::ERRMODE_EXCEPTION,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
        PDO::ATTR_PERSISTENT         => true,
      ]);
      self::$pdo->exec("SET NAMES utf8mb4 COLLATE utf8mb4_unicode_ci");
    }
    return self::$pdo;
  }
}