利用PHP如何实现Socket服务器_PHP
socket服务器的工作方式是这样的，不间断地运行以等待客户端的连接。一旦客户端连接上了，服务器就会将它添加到客户名单中，然后开始等待来自客户端的消息。
不要走开，下面是完整的源代码：
// Set time limit to indefinite execution
set_time_limit (0);
// Set the ip and port we will listen on
$address = 'localhost';
$port = 10000;
$max_clients = 10;
// Array that will hold client information
$client = Array();
// Create a TCP Stream socket
$sock = socket_create(AF_INET, SOCK_STREAM, 0);
// Bind the socket to an address/port
socket_bind($sock, $address, $port) or die('Could not bind to address');
// Start listening for connections
socket_listen($sock);
echo "Waiting for connections...\r\n";
// Loop continuously
while (true) {
// Setup clients listen socket for reading
$read[0] = $sock;
for ($i = 0; $i < $max_clients; $i++) {
if (isset($client[$i]['sock']))
$read[$i + 1] = $client[$i]['sock'];
}
// Set up a blocking call to socket_select()
if (socket_select($read, $write = NULL, $except = NULL, $tv_sec = 5) < 1)
continue;
/* if a new connection is being made add it to the client array */
if (in_array($sock, $read)) {
for ($i = 0; $i < $max_clients; $i++) {
if (empty($client[$i]['sock'])) {
$client[$i]['sock'] = socket_accept($sock);
echo "New client connected $i\r\n";
break;
}
elseif ($i == $max_clients - 1)
echo "Too many clients...\r\n";
}
} // end if in_array
// If a client is trying to write - handle it now
for ($i = 0; $i < $max_clients; $i++) { // for each client
if (isset($client[$i]['sock'])) {
if (in_array($client[$i]['sock'], $read)) {
$input = socket_read($client[$i]['sock'], 1024);
if ($input == null) {
echo "Client disconnecting $i\r\n";
// Zero length string meaning disconnected
unset($client[$i]);
} else {
echo "New input received $i\r\n";
// send it to the other clients
for ($j = 0; $j < $max_clients; $j++) {
if (isset($client[$j]['sock']) && $j != $i) {
echo "Writing '$input' to client $j\r\n";
socket_write($client[$j]['sock'], $input, strlen($input));
}
}
if ($input == 'exit') {
// requested disconnect
socket_close($client[$i]['sock']);
}
}
} else {
echo "Client disconnected $i\r\n";
// Close the socket
socket_close($client[$i]['sock']);
unset($client[$i]);
}
}
}
} // end while
// Close the master sockets
socket_close($sock); 哎呀，乍一看这似乎是一个大工程，但是我们可以先将它分解为几个较小的部分。
第一部分是创建服务器。Lines：2至20。
这部分代码设置了变量、地址、端口、最大客户端和客户端数组。接下来创建socket并将其绑定到我们指定的地址和端口上。
下面我们要做的事情就是执行一个死循环（实际上我们是故意的！）。Lines：22至32。
在这部分代码中我们做的第一步是设置 $read 数组。此数 组包含所有客户端的套接字和我们主服务器的套接字。这个变量稍后会用于select语句：告诉PHP监听来自这些客户端的每一条消息。
socket_select()的最后一个参数告诉我们的服务器在返回值之前最多等待5秒钟。如果它的返回值小于1，那么就表示没有收到任何数据，所以只需要返回循环顶部，继续等待。
脚本的下一个部分，是增加新的客户端到数组中。Lines：33至44。
将新的客户端放置在列表的末尾。检查以确保客户端的数量没有超过我们想要服务器处理的数量。
下面要介绍的代码块相当大，也是服务器的主要部分。当客户端将消息发送到服务器时，就需要这块代码挺身而出来处理。消息可以是各种各样的，断开消息、实际断开——只要是服务器需要处理的消息。Lines：46至末尾。
代码循环通过每个客户端并检查是否收到来自于它们的消息。如果是，获取输入的内容。根据输入来检查这是否是一个断开消息，如果是那就从数组中删除它们，反之，那它就是一个正常的消息，那我们的服务器再次通过所有客户端，并一个一个写信息给他们，跳过发送者。
好了，下面试试创造你自己的聊天服务器吧！
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
Video Face Swap
Swap faces in any video effortlessly with our completely free AI face swap tool!
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
1664
14
1423
52
1321
25
1269
29
1249
24
PHP and Python: Comparing Two Popular Programming Languages
Apr 14, 2025 am 12:13 AM
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 in Action: Real-World Examples and Applications
Apr 14, 2025 am 12:19 AM
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: A Key Language for Web Development
Apr 13, 2025 am 12:08 AM
PHP is a scripting language widely used on the server side, especially suitable for web development. 1.PHP can embed HTML, process HTTP requests and responses, and supports a variety of databases. 2.PHP is used to generate dynamic web content, process form data, access databases, etc., with strong community support and open source resources. 3. PHP is an interpreted language, and the execution process includes lexical analysis, grammatical analysis, compilation and execution. 4.PHP can be combined with MySQL for advanced applications such as user registration systems. 5. When debugging PHP, you can use functions such as error_reporting() and var_dump(). 6. Optimize PHP code to use caching mechanisms, optimize database queries and use built-in functions. 7
The Enduring Relevance of PHP: Is It Still Alive?
Apr 14, 2025 am 12:12 AM
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.
PHP vs. Python: Understanding the Differences
Apr 11, 2025 am 12:15 AM
PHP and Python each have their own advantages, and the choice should be based on project requirements. 1.PHP is suitable for web development, with simple syntax and high execution efficiency. 2. Python is suitable for data science and machine learning, with concise syntax and rich libraries.
PHP and Python: Code Examples and Comparison
Apr 15, 2025 am 12:07 AM
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 vs. Other Languages: A Comparison
Apr 13, 2025 am 12:19 AM
PHP is suitable for web development, especially in rapid development and processing dynamic content, but is not good at data science and enterprise-level applications. Compared with Python, PHP has more advantages in web development, but is not as good as Python in the field of data science; compared with Java, PHP performs worse in enterprise-level applications, but is more flexible in web development; compared with JavaScript, PHP is more concise in back-end development, but is not as good as JavaScript in front-end development.
PHP and Python: Different Paradigms Explained
Apr 18, 2025 am 12:26 AM
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.
