php mysqli取出的数据都成了string

mysqli是可以获取数据库中的数据类型的，但是默认并没有开启。需要设置option参数  MYSQLI_OPT_INT_AND_FLOAT_NATIVE

function __construct($database, $username, $password, $hostname='localhost', $port=3306, $persistant = false){
    $this->database = $database;
    $this->username = $username;
    $this->password = $password;
    $this->hostname = $hostname.':'.$port;
    
    $this->Connect($persistant);
    
    mysqli_query($this->databaseLink,"SET NAMES UTF8");
        mysqli_options($this->databaseLink,MYSQLI_OPT_INT_AND_FLOAT_NATIVE,true);
  }

当然pdo也是可以的

$pdo = new PDO('mysql:host=127.0.0.1;dbname=test', 'root', '');

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

$pdo->setAttribute(PDO::ATTR_STRINGIFY_FETCHES, false);

foreach ($pdo->query('select * from test_int') as $row) {

var_dump($row);

}