Introduction

RabbitMQ, and messaging in general, uses some jargon.（常用术语）

• Producing means nothing more than sending. A program that sends messages is a producer. We'll draw it like that, with "P":

• 生产无非就是发送。一个发送消息的程序就是一个“生产者”，我们用“P”来表示它。

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• A queue is the name for a mailbox. It lives inside RabbitMQ. Although messages flow through RabbitMQ and your applications, they can be stored only inside a queue. A queue is not bound by any limits, it can store as many messages as you like - it's essentially an infinite buffer. Many producers can send messages that go to one queue - many consumers can try to receive data from one queue. A queue will be drawn like this, with its name above it:
  

• 队列就像是邮箱的名字。它存于RabbitMQ内部。尽管消息流贯穿于RabbitMQ和你的应用，但它只能存储于队列当中。队列不受任何限制，随便你存多少消息，看你心情-队列本质上是一个无穷大的缓冲区。 多个“消费者”可以发送消息给一个队列-多个“消费者”也可以从一个队列接收消息。我们这样来表示一个队列（如下），上面是它的名字。

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• Consuming has a similar meaning to receiving. A consumer is a program that mostly waits to receive messages. On our drawings it's shown with "C":

• 消费意思就是接收。”消费者“通常是一个等待接受消息的程序。我们用“C”来表示。

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Note that the producer, consumer, and broker do not have to reside on the same machine; indeed in most applications they don't.

注意：生产者、消费者和消息代理（中间人）不是必须在一个机器上，确实如此，大多数应用程序都这样。

"Hello World"

(using the php-amqplib Client)

In this part of the tutorial we'll write two programs in PHP; a producer that sends a single message, and a consumer that receives messages and prints them out. We'll gloss over some of the detail in the php-amqplib API, concentrating on this very simple thing just to get started. It's a "Hello World" of messaging.