要在PHP中使用AMQP實現消息隊列，首先需要安裝一個AMQP擴展，如php-amqplib/php-amqplib。以下是一個簡單的示例，展示了如何使用AMQP實現生產者（發送者）和消費者（接收者）之間的通信。

1. 安裝php-amqplib/php-amqplib庫：

composer require php-amqplib/php-amqplib

2. 創建一個生產者（sender.php）：

<?php
require_once __DIR__ . '/vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPStreamConnection;
use PhpAmqpLib\Message\AMQPMessage;

$connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest');
$channel = $connection->channel();

$channel->queue_declare('hello', false, false, false, false);

$message = new AMQPMessage('Hello World!');
$channel->basic_publish($message, '', 'hello');

echo " [x] Sent 'Hello World!'\n";

$channel->close();
$connection->close();

3. 創建一個消費者（receiver.php）：

<?php
require_once __DIR__ . '/vendor/autoload.php';
use PhpAmqpLib\Connection\AMQPStreamConnection;

$connection = new AMQPStreamConnection('localhost', 5672, 'guest', 'guest');
$channel = $connection->channel();

$channel->queue_declare('hello', false, false, false, false);

echo " [*] Waiting for messages. To exit press CTRL+C\n";

$callback = function ($msg) {
    echo " [x] Received ", $msg->body, "\n";
};

$channel->basic_consume('hello', '', false, true, false, false, $callback);

while ($channel->is_consuming()) {
    $channel->wait();
}

$channel->close();
$connection->close();

4. 分別運行生產者和消費者腳本：

php sender.php
php receiver.php

在這個例子中，生產者將發送一條消息到名為hello的隊列，而消費者將從該隊列接收并處理消息。這就是如何使用AMQP實現PHP中的消息隊列。