


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.

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.


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