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IO multiplexing of PHP+Socket series and implementation of web server
IO multiplexing of PHP+Socket series and implementation of web server
This article brings you relevant knowledge about php socket, which mainly introduces IO multiplexing and how php socket implements web server? Friends who are interested can take a look below. I hope it will be helpful to everyone.
php native socket IO multiplexing and web server implementation
Multiplexing
- Multiple processes, that is, multiple processes are started on the server to monitor
- IO multiplexing mechanism, which simply implements the use of N clients One network cable simultaneously accesses
select and epoll, common In the software, Apache uses the select model, and nginx uses the epoll model. The select model is built into php, and the corresponding function is socket_select. Multiplexing is the basis for implementing the http server.
socket_select function that implements the select model. Its syntax is as follows:
socket_select( array &$read, array &$write, array &$except, int $seconds [, int $microseconds = 0]): int|false
-
read
The socket resource monitored by the server, when it changes (that is, a new message is received or a client is connected or disconnected),The socket_select
function will return (otherwise it will continue to block), and at the same time modify the variable to the socket resource list of the current event (received message or client connection or disconnection), and continue to execute downwards. -
write
#Monitor whether there is a client writing data. Passing innull
means that you don’t care whether there are any write changes. -
except
The elements to be excluded in the socket, passing innull
is "listening" All -
seconds
Seconds and microseconds together form the timeout parameter. Ifnull
is passed in, it will block, and if it is 0, it will be non-blocking. If it is >0, it will be the maximum blocking time microseconds
<?php
// 创建套接字
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
// 设置 ip 被释放后立即可使用
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, true);
// 绑定ip与端口
socket_bind($socket, 0, 8888);
// 开始监听
socket_listen($socket);
$sockets[] = $socket;
while (true) {
$tmp_sockets = $sockets;
socket_select($tmp_sockets, $write, $except, null);
foreach ($tmp_sockets as $sock) {
// 如果当前套接字等于 socket_create 创建的套接字，说明是有新的连接或有新的断开连接
if ($sock == $socket) {
$conn_sock = socket_accept($socket);
$sockets[] = $conn_sock;
socket_getpeername($conn_sock, $ip, $port);
echo '请求ip: ' . $ip . '端口: ' . $port . PHP_EOL;
} else { // 否则说明是之前连接的客户端发来消息
$msg = socket_read($sock, 10240);
socket_write($sock, strtoupper($msg));
echo $msg;
}
}
}socket_select function will block the current process. When the $tmp_sockets socket resource in the array has new When the client connects or disconnects or receives a new message, it will modify the $tmp_sockets array to the currently active socket resource, and then process the business logic by traversing the array
Use socket to implement a simple http server
http protocol specifies the specified data format based on socket, so we only need tosocket_write When sending data according to the format, the browser can respond to the request normally
<?php
// 创建套接字
$socket = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
// 设置 ip 被释放后立即可使用
socket_set_option($socket, SOL_SOCKET, SO_REUSEADDR, true);
// 绑定ip与端口
socket_bind($socket, 0, 8888);
// 开始监听
socket_listen($socket);
$sockets[] = $socket;
while (true) {
$tmp_sockets = $sockets;
socket_select($tmp_sockets, $write, $except, null);
foreach ($tmp_sockets as $sock) {
if ($sock == $socket) {
$conn_sock = socket_accept($socket);
$sockets[] = $conn_sock;
} else {
$msg = socket_read($sock, 10240);
var_dump($msg);
if ($msg == '') return;
$output = '<h1 id="this-nbsp-is-nbsp-php-nbsp-worker">this is php worker</h1>';
$len = strlen($output);
$response = "HTTP/1.1 200 OK\r\n";
$response .= "content-type: text/html\r\n";
$response .= "server: php socket\r\n";
$response .= "Content-Length: {$len}\r\n\r\n";
$response .= $output;
socket_write($sock, $response);
}
}
}ip:8888 in the browser, you can see the following:
GET / HTTP/1.1 Host: 124.222.**.**:8888 Connection: keep-alive Cache-Control: max-age=0 Upgrade-Insecure-Requests: 1 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/101.0.0.0 Safari/537.36 Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9 Accept-Encoding: gzip, deflate Accept-Language: zh-CN,zh;q=0.9 Cookie: jenkins-timestamper-offset=-28800000; _ga=GA1.1.1403944751.1652010033; _ga_2GM6102E19=GS1.1.1652802985.7.1.1652803014.0
file_get_content Read the content of the specified file and return it to the browser
Recommended learning: "PHP Video Tutorial"
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