$db->setAttribute(PDO::ATTR_EMULATE_PREPARES, false);

这解决了我的问题

我在使用Doctrine时也遇到了同样的问题，所以基本上解决方法是PDO，特别是如果您不想或无法配置它以避免转换为字符串的话。
创建一个类

Class Entity {
    public int $ID;
    public string $Type;
    public string $Description;
}

然后将类名与\PDO：：FETCH_CLASS沿着传递

$sql = "SELECT * FROM `Type`";
$stmt = $pdo->prepare($sql);
$stmt->execute();
$result = $stmt->fetchAll(\PDO::FETCH_CLASS, Entity::class);

$result将是这样的：

array:2 [
  0 => Entity {
    ID: 1
    Type: "Classic Starters"
    Description: ""
  }
  1 => Entity {
    ID: 1
    Type: "Special Starters"
    Description: ""    
  }
]

我需要使用一个 “动态类名”。所以这里有一个替代@Sergey Onishchenko的答案：

//I conditionally set the class name and sql statement.
$fetchClass='Entity';
$sql = "SELECT * FROM `Type`";

$stmt = $pdo->prepare($sql);
$stmt->execute();
$result = $stmt->fetchAll(PDO::FETCH_CLASS, $fetchClass); //I removed the backslash in front of PDO::FETCH_CLASS, because I don't know it's purpose and it also works wihout a backlash.

它不使用Entity::class或变量名，而是直接使用字符串：

$result = $stmt->fetchAll(PDO::FETCH_CLASS, 'Entity');