PHP实现连接设备、通讯和发送命令的方法_PHP
本文实例讲述了PHP实现连接设备、通讯和发送命令的方法。分享给大家供大家参考。具体如下:
开发的BS架构的软件(PHP),需要跟设备进行通讯,在此记录一下,欢迎各位指正:
1. 采用php socket技术使用TCP/IP连接设备
参数$service_port 连接端口
参数$address 发送IP地址
参数$in 发送命令
function Send_socket_connect($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 $buffer为返回值
function Send_socket_xdcoder($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 $buffer; }
2. 采用php socket技术使用UDP协议连接设备,实现通讯和发送命令
参数$service_port 连接端口
参数$address 发送IP地址
参数$in 发送命令
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 $buffer 为返回值
function Send_socket_xdcoder_udp($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 $buffer; } else { echo "<script>alert('网络异常,请检查网络连接!!');</script>"; } }
3. 采用RS232串口技术连接设备,实现通讯和发送命令
参数$com 串口号
参数$baudratr 波特率
参数$in 发送命令
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 }
还有一个关于命令16进制转换的:
function hexToStr($hex) { $string = ""; for ($i = 0; $i < strlen($hex) - 1; $i+=3) { $string.=chr(hexdec($hex[$i] . $hex[$i + 1])); } return $string; }
希望本文所述对大家的php程序设计有所帮助。

Hot AI Tools

Undresser.AI Undress
AI-powered app for creating realistic nude photos

AI Clothes Remover
Online AI tool for removing clothes from photos.

Undress AI Tool
Undress images for free

Clothoff.io
AI clothes remover

AI Hentai Generator
Generate AI Hentai for free.

Hot Article

Hot Tools

Notepad++7.3.1
Easy-to-use and free code editor

SublimeText3 Chinese version
Chinese version, very easy to use

Zend Studio 13.0.1
Powerful PHP integrated development environment

Dreamweaver CS6
Visual web development tools

SublimeText3 Mac version
God-level code editing software (SublimeText3)

Hot Topics



PHP 8.4 brings several new features, security improvements, and performance improvements with healthy amounts of feature deprecations and removals. This guide explains how to install PHP 8.4 or upgrade to PHP 8.4 on Ubuntu, Debian, or their derivati

Visual Studio Code, also known as VS Code, is a free source code editor — or integrated development environment (IDE) — available for all major operating systems. With a large collection of extensions for many programming languages, VS Code can be c

This tutorial demonstrates how to efficiently process XML documents using PHP. XML (eXtensible Markup Language) is a versatile text-based markup language designed for both human readability and machine parsing. It's commonly used for data storage an

If you are an experienced PHP developer, you might have the feeling that you’ve been there and done that already.You have developed a significant number of applications, debugged millions of lines of code, and tweaked a bunch of scripts to achieve op

JWT is an open standard based on JSON, used to securely transmit information between parties, mainly for identity authentication and information exchange. 1. JWT consists of three parts: Header, Payload and Signature. 2. The working principle of JWT includes three steps: generating JWT, verifying JWT and parsing Payload. 3. When using JWT for authentication in PHP, JWT can be generated and verified, and user role and permission information can be included in advanced usage. 4. Common errors include signature verification failure, token expiration, and payload oversized. Debugging skills include using debugging tools and logging. 5. Performance optimization and best practices include using appropriate signature algorithms, setting validity periods reasonably,

A string is a sequence of characters, including letters, numbers, and symbols. This tutorial will learn how to calculate the number of vowels in a given string in PHP using different methods. The vowels in English are a, e, i, o, u, and they can be uppercase or lowercase. What is a vowel? Vowels are alphabetic characters that represent a specific pronunciation. There are five vowels in English, including uppercase and lowercase: a, e, i, o, u Example 1 Input: String = "Tutorialspoint" Output: 6 explain The vowels in the string "Tutorialspoint" are u, o, i, a, o, i. There are 6 yuan in total

Static binding (static::) implements late static binding (LSB) in PHP, allowing calling classes to be referenced in static contexts rather than defining classes. 1) The parsing process is performed at runtime, 2) Look up the call class in the inheritance relationship, 3) It may bring performance overhead.

What are the magic methods of PHP? PHP's magic methods include: 1.\_\_construct, used to initialize objects; 2.\_\_destruct, used to clean up resources; 3.\_\_call, handle non-existent method calls; 4.\_\_get, implement dynamic attribute access; 5.\_\_set, implement dynamic attribute settings. These methods are automatically called in certain situations, improving code flexibility and efficiency.
