PHP : could not find driver (PDO, MySql)

Question

<?php

error_reporting( E_ALL & ~E_DEPRECATED & ~E_NOTICE );
ob_start();
session_start();

define('DB_DRIVER', 'mysql');
define('DB_SERVER', 'localhost');
define('DB_SERVER_USERNAME', 'root');
define('DB_SERVER_PASSWORD', '');
define('DB_DATABASE', 'db_test');

define('PROJECT_NAME', 'Testing create');
$dboptions = array(
        PDO::ATTR_PERSISTENT => FALSE,
        PDO::ATTR_DEFAULT_FETCH_MODE => PDO::FETCH_ASSOC,
        PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
        PDO::MYSQL_ATTR_INIT_COMMAND => 'SET NAME utf8',
    );

try{
    $DB = new PDO(DB_SERVER. ':host='.DB_SERVER. ';dbname='.DB_DATABASE,DB_SERVER_USERNAME, DB_SERVER_PASSWORD , $dboptions);
}catch (Exception $ex) {
    echo $ex->getMessage();
    die;
}

require_once 'functions.php';

if($_SESSION["errorType"] != "" && $_SESSION["errorMsg"] != "" ){
    $ERROR_TYPE = $_SESSION["errorType"];
    $ERROR_MSG = $_SESSION["errorMsg"];
    $_SESSION["errorType"] = "";
    $_SESSION["errorMsg"] = "";
}

?>

上面的代码给出错误“找不到驱动程序”。我正在关注 this tutorial创建它们，下载它们的源代码并在浏览器上查看，完全没有错误。但是当我试图基于他们创建我的程序时，我得到了错误。仅供引用，我的 PDO 扩展已启用，检查了两次。

我的代码有什么问题？

提前谢谢你。

Answer 1

将 $DB 更正为:

$DB = new PDO(DB_DRIVER. ':host='.DB_SERVER. ';dbname='.DB_DATABASE,DB_SERVER_USERNAME, DB_SERVER_PASSWORD , $dboptions);

下面是更容易理解的示例

$db = new PDO('dblib:host=your_hostname;dbname=your_db;charset=UTF-8', $user, $pass);