php stomp消息優(yōu)先級怎樣設(shè)置

在PHP的STOMP消息中，設(shè)置消息優(yōu)先級可以通過在消息頭（headers）中添加priority字段來實(shí)現(xiàn)。優(yōu)先級值的范圍是1到9，其中1表示最高優(yōu)先級，9表示最低優(yōu)先級。以下是一個(gè)使用php-stomp庫發(fā)送優(yōu)先級消息的示例：

首先，確保已經(jīng)安裝了php-stomp庫。如果沒有安裝，可以使用Composer進(jìn)行安裝：

composer require cboden/ratchet-stomp

然后，創(chuàng)建一個(gè)發(fā)送優(yōu)先級消息的示例：

<?php
require 'vendor/autoload.php';

use Ratchet\Client\WebSocket;
use Ratchet\MessageComponentInterface;
use Ratchet\ConnectionInterface;
use Stomp\Client as StompClient;
use Stomp\Protocol\Frame;

class MyStompClient implements MessageComponentInterface {
    protected $stompClient;

    public function __construct() {
        $this->connect();
    }

    public function connect() {
        $this->stompClient = new StompClient('tcp://localhost:61613');
        $this->stompClient->connect();
    }

    public function onOpen(ConnectionInterface $conn) {
        echo "Connected to STOMP server\n";
    }

    public function onClose(ConnectionInterface $conn) {
        echo "Disconnected from STOMP server\n";
    }

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

    public function onMessage(ConnectionInterface $from, $msg) {
        echo "Received message: {$msg}\n";
    }

    public function sendPriorityMessage($queue, $message, $priority = 1) {
        $headers = [
            'priority' => $priority,
        ];

        $this->stompClient->send("/queue/{$queue}", $message, $headers);
    }
}

$client = new MyStompClient();
$client->sendPriorityMessage('my_queue', 'Hello, World!', 9);

在這個(gè)示例中，我們創(chuàng)建了一個(gè)名為MyStompClient的類，它實(shí)現(xiàn)了MessageComponentInterface接口。我們使用StompClient類連接到STOMP服務(wù)器，并通過sendPriorityMessage方法發(fā)送優(yōu)先級消息。在sendPriorityMessage方法中，我們通過設(shè)置priority頭來指定消息的優(yōu)先級。