php socket编程入门

<?php

// 判断我们的PHP有没有加载sockets模块
if (!extension_loaded('sockets')) {
die('对不起你还没有安装sockets扩展.');
}

// 接受客户端请求，回复固定的响应内容
function server_listen_socket ($address, $port)
{
$buffer = "这个消息来自于服务器，socket say hello";
$len = strlen($buffer);

// create, bind and listen to socket

// 创建通讯节点（套接字）
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if (! $socket) {
echo "failed to create socket:" . socket_strerror($socket) . "\n";
exit();
}

// 为这个套接字绑定地址和侦听端口
$bind_flag = socket_bind($socket, $address, $port);
if (! $bind_flag) {
echo "failed to bind socket:" . socket_strerror($bind_flag) . "\n";
exit();
}

// 侦听端口号
$backlog = 20;
$listen_flag = socket_listen($socket, $backlog);
if (! $listen_flag) {
echo "failed to listen to socket:" . socket_strerror($listen_flag) . "\n";
exit();
}

echo "等待客户端连接中。。。\n";

while (1) {
if (($accept_socket = socket_accept($socket)) == FALSE) {
continue;
} else {
socket_write($accept_socket, $buffer, $len);
socket_close($accept_socket);
}
}
}

function run_server ()
{
// pcntl_fork()返回值如果为-1，则说明执行失败
// 0说明在子进程中，大于0说明在父进程中
$pid1 = pcntl_fork();
if ($pid1 == 0) {
// first child process

// 守护进程的一般流程：fork()->setsid()->fork()
posix_setsid();

if (($pid2 = pcntl_fork()) == 0) {
$address = "192.168.3.52";
$port = "8767";
server_listen_socket($address, $port);
} else {
// 防止获得控制终端
exit();
}

} else {
// wait for first child process exit
pcntl_wait($status);
}
}

// 屏蔽76行，打开79-81行不后台运行，打开76行，关闭79-81行启用后台进程守护

// server守护进程
// run_server();

// 不守护进程
$address = "192.168.3.52";
$port = "8767";
server_listen_socket($address, $port);