PHP实现web socket长链接流程详解

简介

目前PHP实现web socket 都是使用框架集成来实现,比如hyperf,swoft,或者是安装swoole 扩展来实现websocket,那么有没有PHP本身就能够实现的呢,答案当然有,Let’s go.

函数介绍

服务端

stream_socket_server — Create an Internet or Unix domain server socket

可以帮我创建网络链接具柄,参数如下

stream_socket_server(
string $address,
int &$error_code = null,
string &$error_message = null,
int $flags = STREAM_SERVER_BIND | STREAM_SERVER_LISTEN,
?resource $context = null
): resource|false

客户端

stream_socket_client — Open Internet or Unix domain socket connection

连接句柄

stream_socket_client(
string $address,
int &$error_code = null,
string &$error_message = null,
?float $timeout = null,
int $flags = STREAM_CLIENT_CONNECT,
?resource $context = null
): resource|false

简单运用

<?php //服务端
$socket = stream_socket_server("tcp://0.0.0.0:8000", $errno, $errstr);
if (!$socket) {
 echo "$errstr ($errno)<br />\n";
} else {
 while ($conn = stream_socket_accept($socket)) { //循环 等待链接
 fwrite($conn, 'The local time is ' . date('n/j/Y g:i a') . "\n");//成功链接输出以上内容 大致为:The local time is 3/22/2023 11:13 am
 fclose($conn); //断开连接
 }
 fclose($socket); //断开socket
}
?>
<?php //客户端
$fp = stream_socket_client("tcp://0.0.0.0:8000", $errno, $errstr, 30);
if (!$fp) {
 echo "$errstr ($errno)<br />\n";
} else {
 fwrite($fp, "GET / HTTP/1.0\r\nHost: www.example.com\r\nAccept: */*\r\n\r\n");
 while (!feof($fp)) {
 echo fgets($fp, 1024);
 }
 fclose($fp);
}
?>

解释

上面的事例,只能在服务器之间调用,而且每次链接都会断开,一旦需要使用服务就需要不断的进行连接,不断的进行三次握手很浪费资源,那么能不能实现一个呢,No Code No BB.

JsDemo

// 创建websocket
ws = new WebSocket("ws://"+domain+"/"+port);
// 当socket连接打开时,输入用户名
ws.onopen = function(){}; //自定义 连接建立时处理操作,比如IM系统登陆信息操作
// 当有消息时根据消息类型显示不同信息
ws.onmessage = function(){};// 操作服务端发来的消息 
ws.onclose = function() {
 console.log("连接关闭,定时重连");
 connect();//重新连接
};
ws.onerror = function() {
 console.log("出现错误");
};

PHP实现三次握手

$socket = stream_socket_server('tcp://'.$ipServer.':'.$portNumber, $errno, $errstr);
while($conn = @stream_socket_accept($socket,$nbSecondsIdle))
{
 $message= fread($conn, 1024);
 send($conn,$message);
 	//@todo
 	//连接成功,有要保持连接,用来接收客户端发送过来的数据包 这里可以把这个连接$conn 保存在内存当中,通过Select or Swoole 事件去loop
 fputs ($conn, "OK\n");
}
function send($socket,$buffer){
 $Sec_WebSocket_Key = '';
 if (\preg_match("/Sec-WebSocket-Key: *(.*?)\r\n/i", $buffer, $match)) {
 $Sec_WebSocket_Key = $match[1];
 }
 $new_key = \base64_encode(\sha1($Sec_WebSocket_Key . "258EAFA5-E914-47DA-95CA-C5AB0DC85B11", true));
 $handshake_message = "HTTP/1.1 101 Switching Protocols\r\n"
 ."Upgrade: websocket\r\n"
 ."Sec-WebSocket-Version: 13\r\n"
 ."Connection: Upgrade\r\n"
 ."Sec-WebSocket-Accept: " . $new_key . "\r\n";
 $handshake_message .= "\r\n";
 var_dump($handshake_message);//打印握手信息,然后发送给客户端,建立完整连接
 //socket_write($socket,$handshake_message);
 $len = @\fwrite($socket, $handshake_message);
 return 0;
}
作者:深斗士原文地址:https://blog.csdn.net/qq_22635549/article/details/129723549

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