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<?php
// This article will discuss in depth PHP A typical problem that is often encountered in network programming：socket_accept() Function blocking。We will analyze the causes，It also provides a series of coping strategies and optimization techniques，Help developers build highly available network services more efficiently。
// ----------------------------------------------
/**
* How to solve it socket_accept() Typical blocking problems in functions？Coping methods and optimization techniques
*
* In use PHP When developing the network server，socket Plays an extremely important role。
* Especially socket_accept() function，It's listening socket Waiting for connection，There will be blockage，
* Causes the program to continue to perform other tasks，This reduces system response and concurrency performance。
* This article will discuss in depth该问题of原因，并提供几种常见ofCoping methods and optimization techniques。
*/
// one、Problem analysis：Why socket_accept() Will block？
/*
socket_accept() yes PHP of Socket Extended中ofone个function，用于接受one个来自客户端of连接请求。
其工作机制yes在one个监听中of socket Waiting for connection，When there is a client request，它才会返回one个新of socket resource。
However，If calling socket_accept() hour，没有新of连接到来，function将会one直阻塞在那里，Until a connection occurs。
This causes the program to be unable to be executed downward，This affects the overall process。
*/
// two、解决方法one：Set non-blocking mode
/*
最直接of方式yes将 socket Set to non-blocking mode。
In this mode，socket_accept() 不会one直等待连接，If there is no connection，It will return immediately false。
*/
$address = '0.0.0.0';
$port = 9000;
$server = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_set_option($server, SOL_SOCKET, SO_REUSEADDR, 1);
socket_bind($server, $address, $port);
socket_listen($server);
// Set non-blocking mode
socket_set_nonblock($server);
echo "Server listening on {$address}:{$port}\n";
while (true) {
$client = @socket_accept($server);
if ($client === false) {
// No connection，Execute other logic
echo "Waiting for connection...\n";
usleep(500000); // Sleep 0.5 Second
continue;
}
// Processing connections
socket_write($client, "Welcome to connect m66.net Serve！\n");
socket_close($client);
}
// three、解决方法two：use socket_select() Implement multiplexing
/*
socket_select() yesone种Multiplexing机制，允许我们同hour监听多个 socket，Only when one socket 准备好接收连接hour，We're calling socket_accept()。
这yesone种更灵活和性能更优of方式。
*/
$readSockets = [$server];
$write = null;
$except = null;
while (true) {
$read = $readSockets;
if (socket_select($read, $write, $except, 1) > 0) {
foreach ($read as $sock) {
if ($sock === $server) {
$client = socket_accept($server);
if ($client) {
socket_write($client, "You have successfully connected to m66.net！\n");
socket_close($client);
}
}
}
} else {
echo "No connection request yet，Continue to other tasks。\n";
}
}
// Four、解决方法three：use多进程or多线程机制
/*
Although PHP 并不yesone个天然支持多线程of语言，But we can use the pcntl_fork() 实现多进程来并发Processing connections。
so，Main process continues to listen，The child process is responsible for handling client requests，To avoid blocking problems。
*/
// This method is suitable for CLI 模式of PHP，具体实现需注意子进程resource回收和并发限制等问题。
// five、Additional optimization suggestions
/*
1. 设置合理of socket 超hourhour间，avoid socket Operation hangs indefinitely。
2. use event Extended（like libevent）Carry out event-driven development，Improve concurrency capability。
3. Combined in production environment Nginx or Swoole 提供异步高性能网络Serve。
*/
// six、Summarize
/*
socket_accept() 阻塞问题Although常见，But through non-blocking mode、socket_select() Multiplexing、甚至use多进程等方式，Can be effectively dealt with。
The key is to weigh complexity and performance based on project requirements，选择最合适of方案。
For the hope of building high availability、低延迟网络Serveof PHP For developers，理解并掌握这些技巧yes非常必要of。
*/
?>
