utf8mb3_general_ci 轉換成 utf8mb4_general_ci

Question

我正在做評論部分，我想將評論存儲在數據庫中，但我收到此錯誤：未捕獲的 PDOException：SQLSTATE [HY000]：一般錯誤：3988 從排序規則 utf8mb3_general_ci 轉換為 utf8mb4_general_ci 參數不可能

try {
    $pdo = new PDO($db_config, $config['db_user'], $config['db_password'], [
        PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"
    ]);

    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
} catch (PDOException $e) {
    exit("Impossibile connettersi al database: " . $e->getMessage());
}

$check = $pdo->prepare($query);
  $check->bindParam(':uid', $id, PDO::PARAM_STR);
  $check->bindParam(':date', $date, PDO::PARAM_STR);
  $check->bindParam(':message', $message, PDO::PARAM_STR);
  $check->execute();

CREATE TABLE `comments`(
`cid` int(11) not null  AUTO_INCREMENT PRIMARY KEY,
`uid` varchar(128) not null,
`date` datetime not null,
`message` TEXT not null) ENGINE=InnoDB DEFAULT CHARSET=utf8mb4 COLLATE=utf8mb4_general_ci;

Answer 1

像這樣解決

$db_config = $config['db_engine'] . ":host=".$config['db_host'] . ";dbname=" . $config['db_name'].";charset=utf8mb4";

try {
    $pdo = new PDO($db_config, $config['db_user'], $config['db_password'], [
        PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8"
    ]);

    $pdo->setAttribute(PDO::ATTR_ERRMODE, PDO::ERRMODE_EXCEPTION);
    $pdo->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);
} catch (PDOException $e) {
    exit("Impossibile connettersi al database: " . $e->getMessage());
}