推荐：《PHP视频教程》
三种实现方式
通用的异步执行文件 exec.php
sleep(8);
$data = "--- type " . date("Y-m-d H:i:s") . " ---\\n";
file_put_contents("../log.txt", $data, FILE_APPEND);popen
通过 popen() 函数打开进程文件指针，从而能异步执行脚本文件。（只在linux下有效）
pclose(popen("php exec.php &", 'r'));
echo 1;
缺点：只能异步执行本地的脚本文件，不能跨域执行，不能传递参数。
每次执行都会创建新的进程，当并发量高时就创建大量进程，从而造成资源浪费。
curl
应用程序以 curl 发起 http 请求的形式实现异步。但是 curl 请求也需要等待请求返回，程序同样会阻塞，这时我们需要设置 http 请求的超时时间为1s，这样相当于发起了一个 http 请求去执行任务，但是不等待其返回结果，继续向下执行程序，这样就可以实现异步效果。
function asyncCurl($url, $data)
{
if (is_array($data)) {
$data = http_build_query($data, null, '&');
}
$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, $url);
curl_setopt($ch, CURLOPT_POST, 1);
curl_setopt($ch, CURLOPT_POSTFIELDS, $data);
curl_setopt($ch, CURLOPT_TIMEOUT, 1);
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
$result['response'] = curl_exec($ch);
$result['httpCode'] = curl_getinfo($ch, CURLINFO_HTTP_CODE);
return $result;
}
$url = "<http://127.0.0.1/exec.php>";
$data = [];
asyncCurl($url, $data);
echo "OK";curl 请求实现异步方式的缺陷就是 http 请求的最小超时时间为1s。也就是应用程序无论如何都要等待1s钟以上才能响应（现在 curl 扩展也能支持毫秒级别的超时时间设置，不过毫秒时间的超时很容易造成请求失败）。
fsockopen
fsockopen() 函数用于打开一个网络连接或者一个Unix套接字连接。通过发起 http 通信来实现异步。
从原理上来说与 curl 请求一样。
function sockPost($host, $url, $param)
{
$port = parse_url($url, PHP_URL_PORT);
$port = $port ? $port : 80;
$scheme = parse_url($url, PHP_URL_SCHEME);
$path = parse_url($url, PHP_URL_PATH);
$query = http_build_query($param);
if ($scheme == 'https') {
$host = 'ssl://' . $host;
}
$fp = fsockopen($host, $port, $error_code, $error_msg, 1);
if (!$fp) {
return array('error_code' => $error_code, 'error_msg' => $error_msg);
} else {
stream_set_blocking($fp, 0);
stream_set_timeout($fp, 10);
$header = "GET $path" . "?" . "$query" . " HTTP/1.1\\r\\n";
$header .= "Host: $host\\r\\n";
$header .= "Connection: close\\r\\n\\r\\n";//长连接关闭
fwrite($fp, $header);
usleep(2000); // 延时，防止在nginx服务器上无法执行成功
fclose($fp);
return array('error_code' => 0);
}
}
$host = "127.0.0.1";
$url = "/exec.php";
$param = [];
$result = sockPost($host, $url, $param);
var_dump($result);fsockopen 方式相比 curl 更复杂，需要自己拼接处 http 请求的 header 部分。在 curl 不支持毫秒级超时之前 fsockopen 方式无疑是最佳选择。
The above is the detailed content of Three ways to implement asynchrony in PHP. For more information, please follow other related articles on the PHP Chinese website!
PHP: An Introduction to the Server-Side Scripting LanguageApr 16, 2025 am 12:18 AMPHP is a server-side scripting language used for dynamic web development and server-side applications. 1.PHP is an interpreted language that does not require compilation and is suitable for rapid development. 2. PHP code is embedded in HTML, making it easy to develop web pages. 3. PHP processes server-side logic, generates HTML output, and supports user interaction and data processing. 4. PHP can interact with the database, process form submission, and execute server-side tasks.
PHP and the Web: Exploring its Long-Term ImpactApr 16, 2025 am 12:17 AMPHP has shaped the network over the past few decades and will continue to play an important role in web development. 1) PHP originated in 1994 and has become the first choice for developers due to its ease of use and seamless integration with MySQL. 2) Its core functions include generating dynamic content and integrating with the database, allowing the website to be updated in real time and displayed in personalized manner. 3) The wide application and ecosystem of PHP have driven its long-term impact, but it also faces version updates and security challenges. 4) Performance improvements in recent years, such as the release of PHP7, enable it to compete with modern languages. 5) In the future, PHP needs to deal with new challenges such as containerization and microservices, but its flexibility and active community make it adaptable.
Why Use PHP? Advantages and Benefits ExplainedApr 16, 2025 am 12:16 AMThe core benefits of PHP include ease of learning, strong web development support, rich libraries and frameworks, high performance and scalability, cross-platform compatibility, and cost-effectiveness. 1) Easy to learn and use, suitable for beginners; 2) Good integration with web servers and supports multiple databases; 3) Have powerful frameworks such as Laravel; 4) High performance can be achieved through optimization; 5) Support multiple operating systems; 6) Open source to reduce development costs.
Debunking the Myths: Is PHP Really a Dead Language?Apr 16, 2025 am 12:15 AMPHP is not dead. 1) The PHP community actively solves performance and security issues, and PHP7.x improves performance. 2) PHP is suitable for modern web development and is widely used in large websites. 3) PHP is easy to learn and the server performs well, but the type system is not as strict as static languages. 4) PHP is still important in the fields of content management and e-commerce, and the ecosystem continues to evolve. 5) Optimize performance through OPcache and APC, and use OOP and design patterns to improve code quality.
The PHP vs. Python Debate: Which is Better?Apr 16, 2025 am 12:03 AMPHP and Python have their own advantages and disadvantages, and the choice depends on the project requirements. 1) PHP is suitable for web development, easy to learn, rich community resources, but the syntax is not modern enough, and performance and security need to be paid attention to. 2) Python is suitable for data science and machine learning, with concise syntax and easy to learn, but there are bottlenecks in execution speed and memory management.
PHP's Purpose: Building Dynamic WebsitesApr 15, 2025 am 12:18 AMPHP 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: Handling Databases and Server-Side LogicApr 15, 2025 am 12:15 AMPHP 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.
How do you prevent SQL Injection in PHP? (Prepared statements, PDO)Apr 15, 2025 am 12:15 AMUsing 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.
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
SAP NetWeaver Server Adapter for Eclipse
Integrate Eclipse with SAP NetWeaver application server.
Dreamweaver CS6
Visual web development tools
Zend Studio 13.0.1
Powerful PHP integrated development environment
EditPlus Chinese cracked version
Small size, syntax highlighting, does not support code prompt function
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
