ratchet PHP致命错误：未定义的类常量'；MYSQL_ATTR_INIT_命令'；在里面

我试图将ratchet连接到mysql数据库，但我得到了这个erorr 我使用xampp phpmyadmin运行mysql，之前我使用connectToDB.php文件中的代码，使用php将数据从html表单发送到sql行，这一切正常 在添加sql行之前，我测试了

Chat.php

文件中的代码，效果很好，但是在Chat.php中添加了connectToDB.php行之后，我得到了这个错误，那么问题出在哪里呢？ 错误

PHP致命错误：未定义的类常量“MYSQL\u ATTR\u INIT\u COMMAND” 在第19行的htdocs/connectToDB.php中

connectToDB.php

code

<?php
if(!session_id()) session_start();



/* $dbhost  = 'localhost';
//$dbname       = '1852132_ch';
//$dbuser       = 'root';
//$dbpass       = ''; */

$dbhost     = "localhost";
$dbname     = "test";
$dbuser     = "root";
$dbpass     = "";

// database connection
try{
    $_db = new PDO("mysql:host=$dbhost;dbname=$dbname",$dbuser,$dbpass, array(
                    PDO::MYSQL_ATTR_INIT_COMMAND => "SET NAMES utf8", 
                    PDO::ATTR_ERRMODE => PDO::ERRMODE_EXCEPTION,
                    PDO::ATTR_PERSISTENT => true
                )); 
}catch(Excepion $e){
    die("ERROR : ".$e->getMessage());
}
?>

---

在php.ini文件中，应该有以下行（未注释）：

---

然后重新启动apache并在任何部分中尝试您的代码

@rafid？有[pdo]、[pcre]等部分。。我应该在其中任何一个中添加它？转到xampp控制面板，单击

config

按钮，打开`php.ini`文件，搜索

php_pdo_mysql

并删除

在php_pdo_mysql之前保存。然后重新启动apache并尝试您的代码

<?php
namespace MyApp;

include('/opt/lampp/htdocs/ww/classes/user.php');
include('/opt/lampp/htdocs/ww/connectToDB.php');

use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;

class Chat implements MessageComponentInterface {
    protected $clients;

    public function __construct() {
        $this->clients = new \SplObjectStorage;
    }

    public function onOpen(ConnectionInterface $conn) {
        // Store the new connection to send messages to later
        $this->clients->attach($conn);

        echo "New connection! ({$conn->resourceId})\n";
        $sql = $_db->query("UPDATE users SET userid= '1999' WHERE UserName='batman'");

    }

    public function onMessage(ConnectionInterface $from, $msg) {
        $numRecv = count($this->clients) - 1;
        echo sprintf('Connection %d sending message "%s" to %d other connection%s' . "\n"
            , $from->resourceId, $msg, $numRecv, $numRecv == 1 ? '' : 's');

        foreach ($this->clients as $client) {
            if ($from !== $client) {
                // The sender is not the receiver, send to each client connected
                $client->send($msg);
            }
        }
    }

    public function onClose(ConnectionInterface $conn) {
        // The connection is closed, remove it, as we can no longer send it messages
        $this->clients->detach($conn);

        echo "Connection {$conn->resourceId} has disconnected\n";
    }

    public function onError(ConnectionInterface $conn, \Exception $e) {
        echo "An error has occurred: {$e->getMessage()}\n";

        $conn->close();
    }
}

extension=php_pdo_mysql.dll on Windows
extension=php_pdo_mysql.so on Linux/Mac