Analysis: Implementing a simple chat program through php socket and using telnet_PHP tutorial

The following is a simple message processing server implemented through PHP's socket extension module: bind to a local port, listen for client connections, receive data and forward it to all clients except the sender
socket_server.php

Copy code The code is as follows:

#!/usr/bin/env php
//author:zhxia
if(!extension_loaded('sockets')){
die('the sockets extension is not loaded!');
}
const PORT=9981;
$socket=socket_create(AF_INET,SOCK_STREAM,SOL_TCP) or die('socket create error!');
#Reuse the port by setting this option
socket_set_option ($socket,SOL_SOCKET,SO_REUSEADDR,1);
socket_bind($socket,0,PORT);
socket_listen($socket);
#Use non-blocking mode
socket_set_nonblock($socket);
echo 'listen on port '.PORT.'...'.PHP_EOL;
$clients=array($socket);
while(TRUE){
$read=$clients;
$write=$except=array();
//Detect whether the socket status changes through the select system call
if(socket_select($read,$write,$except,0)<1) {
continue;
}
//Detect if there is a client to connect
if(in_array($socket,$read)){
$clients[]=$newsocket=socket_accept ($socket);
socket_write($newsocket,"welcome!nthere are ".(count($clients)-1)." client heren");
socket_getpeername($newsocket,$ip);
echo "new client connected:$ipn";
$key=array_search($newsocket,$read);
unset($read[$key]);
}

foreach($read as $read_socket){
$data=@socket_read($read_socket,1024,PHP_NORMAL_READ);
if($data===false){
//If not fetched To the data, it means that the client has disconnected
$ key = array_search ($ read_sockets, $ clients);
unset ($ clients [$ key]);
echo "client disconnectd.n"; continue;
}
$data=trim($data);
if(!empty($data)){
foreach($clients as $write_socket){
                    // Exclude the server and itself, and then send the data to all other clients
if($write_socket==$socket||$write_socket==$read_socket){
continue;
}
socket_write ($write_socket, "$datan" ); ：

zhxia@zhxia-pc:~/sh/php$ ./socket_server.php
listen on port 9981...


Connected via telnet:

zhxia@haozudb:~$ telnet 192.168.187.16 9981
Trying 192.168.187.16...Connected to 192.168.187.16.
Escape character is '^]'.welcome!
there are 1 client here

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TechArticle

The following is a simple message processing server side implemented through the socket extension module of php: bound to a local machine Port, listens for client connections, receives data and forwards it to the sender...