How to use IoT functions in PHP

With the rapid development of IoT technology, more and more applications need to access IoT devices to achieve more intelligent functions. PHP is a very popular web development language that also supports communication with IoT devices. This article will introduce how to use IoT functions in PHP.

1. Install PHP IoT function library

Using IoT functions in PHP requires installing the corresponding function library. Currently, PHP provides two function libraries for communicating with IoT devices, MQTT and AMQP. We can choose to install them according to actual needs.

1. Install the MQTT function library

MQTT is a lightweight message transmission protocol that is commonly used in Internet of Things applications. We can install the MQTT function library through the PECL tool. The specific steps are as follows:

(1) Install the PECL tool:

sudo apt-get install php-pear

(2) Install the MQTT function library:

sudo pecl install Mosquitto-alpha

After the installation is complete, we need to add the following content to the php.ini file:

extension=mosquitto.so

2. Install AMQP Function library

AMQP is an advanced message queue protocol that is also commonly used in Internet of Things applications. We can install the AMQP function library through the PECL tool. The specific steps are as follows:

(1) Install the PECL tool:

sudo apt-get install php-pear

(2) Install the AMQP function library:

sudo pecl install amqp

After the installation is complete, we need to add the following content to the php.ini file:

extension=amqp.so

2. Use PHP Internet of Things Function

1. Use MQTT function

To use the MQTT function, you need to create an MQTT client first, and then you can use the MQTT client to subscribe to topics and publish messages. The specific code is as follows:

//Create MQTT client
$broker = "localhost"; //MQTT server address
$client = new MosquittoClient(); //Create MQTT client object
$client->setLogLevel(MosquittoClient::LOG_LEVEL_DEBUG); //Set the log level
$client->onConnect(function() use ($client) { //Connect to the server

$client->subscribe('/test'); //在主题'/test'上订阅消息

});
$client->onMessage(function($message) { //Callback function after receiving the message

echo $message->payload . "

"; //Print message
});
$client->connect($broker); //Connect to the MQTT server

//Publish a message
$msg = "Hello, MQTT!"; //The message to be published
$client ->publish('/test', $msg, 0, false); //Publish the message to the topic '/test'

2. Use AMQP function

Use AMQP function You also need to create an AMQP client first, and then you can use the client to establish communication pipes and send messages. The specific code is as follows:

//Create AMQP client
$connection = new AMQPConnection(array(

'host' => 'localhost', //AMQP服务器地址
'port' => '5672', //AMQP服务器端口
'username' => 'guest', //AMQP服务器用户名
'password' => 'guest' //AMQP服务器密码

));
$channel = $connection->channel(); //Create a communication channel

//Publish a message
$exchange = 'test_exchange'; / /Exchange name
$queue = 'test_queue'; //Queue name
$msg = new AMQPMessage('Hello, AMQP!'); //Message to be published
$channel->exchange_declare( $exchange, 'fanout', false, true, false); //Declare the switch
$channel->queue_bind($queue, $exchange); //Bind the queue and switch
$channel-> basic_publish($msg, $exchange); //Publish messages to the switch

Summary

As a popular web development language, PHP can easily communicate with IoT devices for Developing smarter applications opens up more possibilities. This article introduces how to use MQTT and AMQP two IoT function libraries in PHP, hoping to provide some reference for readers.

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