


PHP implements methods of connecting devices, communicating and sending commands, php commands_PHP tutorial
PHP implements the method of connecting devices, communicating and sending commands, php command
The example in this article describes the method of PHP implementing connecting devices, communicating and sending commands. Share it with everyone for your reference. The details are as follows:
The BS architecture software (PHP) developed needs to communicate with the device. I will record it here and welcome your corrections:
1. Use php socket technology to connect devices using TCP/IP
Parameter $service_port connection port
Parameter $address sending IP address
Parameter $in Send command
function Send_socket_connect($service_port, $address, $in) { //创建 TCP/IP socket$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("could not create socket!"); //设置超时时间 $timeout = 2; $time = time(); //设置非阻塞模式 @socket_set_nonblock($socket); //超时判断 while (!@socket_connect($socket, $address, $service_port)) { $err = socket_last_error($socket); // 连接成功,跳出循环 if ($err === 10056) { break; } //连接失败,判断超时时间,停止 if ((time() - $time) >= $timeout) { socket_close($socket); print('网络异常,请检查网络连接!!'); exit(); } // 刷新频率(250毫秒) usleep(250000); } //设置阻塞模式 @socket_set_block($socket); //发送命令到设备 socket_write($socket, $in, strlen($in)); //关闭连接 socket_close($socket); }
Send_socker_xdcoder $buffer is the return value
function Send_socket_xdcoder($service_port, $address, $in) { //创建 TCP/IP socket $socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP) or die("could not create socket!"); //设置超时时间 $timeout = 2; $time = time(); //设置非阻塞模式 @socket_set_nonblock($socket); //超时判断 while (!@socket_connect($socket, $address, $service_port)) { $err = socket_last_error($socket); // 连接成功 if ($err === 10056) { break; } //连接失败,判断超时时间,停止 if ((time() - $time) >= $timeout) { socket_close($socket); echo "<script>alert('网络异常,请检查网络连接!!');</script>"; exit(); } // 刷新频率(250毫秒) usleep(250000); } //设置阻塞模式 @socket_set_block($socket); //发送命令到设备 socket_write($socket, $in, strlen($in)); //接收设备命令返回数据 $buffer = socket_read($socket, 1024, PHP_NORMAL_READ); //关闭连接 socket_close($socket); //输出返回值 return $buffer; }
2. Use php socket technology to connect devices using UDP protocol to implement communication and send commands
Parameter $service_port connection port
Parameter $address sending IP address
Parameter $in Send command
function Send_socket_connect_udp($service_port, $address, $in) { //采用php socket技术使用UDP协议连接设备 $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP); @socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array("sec" => 2, "usec" => 0)); //发送命令 @socket_sendto($socket, $in, strlen($in), 0, $address, $service_port); @socket_recvfrom($socket, $buffer, 1024, MSG_WAITALL, $address, $service_port); //关闭连接 if (empty($buffer)) { echo "<script>alert('网络异常,请检查网络连接!!');</script>"; } }
Send_socket_xdcoder_udp $buffer is the return value
function Send_socket_xdcoder_udp($service_port, $address, $in) { //采用php socket技术使用UDP协议连接设备 $socket = socket_create(AF_INET, SOCK_DGRAM, SOL_UDP); @socket_set_option($socket, SOL_SOCKET, SO_RCVTIMEO, array("sec" => 2, "usec" => 0)); //发送命令 @socket_sendto($socket, $in, strlen($in), 0, $address, $service_port); @socket_recvfrom($socket, $buffer, 1024, MSG_WAITALL, $address, $service_port); //关闭连接 socket_close($socket); if (!empty($buffer)) { return $buffer; } else { echo "<script>alert('网络异常,请检查网络连接!!');</script>"; } }
3. Use RS232 serial port technology to connect devices to achieve communication and send commands
Parameter $com serial port number
Parameter $baudratr baud rate
Parameter $in Send command
function rs232_connect($com, $baudrate, $in) { @set_time_limit(10); //使用 'windows下设置窜口参数'; exec("mode " . $com . " BAUD=" . $baudrate . " PARITY=n DATA=8 STOP=1 odsr=off"); // "打开端口串口$com"; $f = @fopen($com, 'w+'); //判断串口是否正常打开 if (!$f) { //echo "<script>alert('Error when open $com!!');</script>"; die("Error when open $com"); } //向串口发送数据; fwrite($f, $in); //关闭端口 fclose($f); //串口操作结束 }
There is another one about command hexadecimal conversion:
function hexToStr($hex) { $string = ""; for ($i = 0; $i < strlen($hex) - 1; $i+=3) { $string.=chr(hexdec($hex[$i] . $hex[$i + 1])); } return $string; }
I hope this article will be helpful to everyone’s PHP programming design.

PHP is used to build dynamic websites, and its core functions include: 1. Generate dynamic content and generate web pages in real time by connecting with the database; 2. Process user interaction and form submissions, verify inputs and respond to operations; 3. Manage sessions and user authentication to provide a personalized experience; 4. Optimize performance and follow best practices to improve website efficiency and security.

PHP uses MySQLi and PDO extensions to interact in database operations and server-side logic processing, and processes server-side logic through functions such as session management. 1) Use MySQLi or PDO to connect to the database and execute SQL queries. 2) Handle HTTP requests and user status through session management and other functions. 3) Use transactions to ensure the atomicity of database operations. 4) Prevent SQL injection, use exception handling and closing connections for debugging. 5) Optimize performance through indexing and cache, write highly readable code and perform error handling.

Using preprocessing statements and PDO in PHP can effectively prevent SQL injection attacks. 1) Use PDO to connect to the database and set the error mode. 2) Create preprocessing statements through the prepare method and pass data using placeholders and execute methods. 3) Process query results and ensure the security and performance of the code.

PHP and Python have their own advantages and disadvantages, and the choice depends on project needs and personal preferences. 1.PHP is suitable for rapid development and maintenance of large-scale web applications. 2. Python dominates the field of data science and machine learning.

PHP is widely used in e-commerce, content management systems and API development. 1) E-commerce: used for shopping cart function and payment processing. 2) Content management system: used for dynamic content generation and user management. 3) API development: used for RESTful API development and API security. Through performance optimization and best practices, the efficiency and maintainability of PHP applications are improved.

PHP makes it easy to create interactive web content. 1) Dynamically generate content by embedding HTML and display it in real time based on user input or database data. 2) Process form submission and generate dynamic output to ensure that htmlspecialchars is used to prevent XSS. 3) Use MySQL to create a user registration system, and use password_hash and preprocessing statements to enhance security. Mastering these techniques will improve the efficiency of web development.

PHP and Python each have their own advantages, and choose according to project requirements. 1.PHP is suitable for web development, especially for rapid development and maintenance of websites. 2. Python is suitable for data science, machine learning and artificial intelligence, with concise syntax and suitable for beginners.

PHP is still dynamic and still occupies an important position in the field of modern programming. 1) PHP's simplicity and powerful community support make it widely used in web development; 2) Its flexibility and stability make it outstanding in handling web forms, database operations and file processing; 3) PHP is constantly evolving and optimizing, suitable for beginners and experienced developers.


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