创建客户端和服务器端套接字连接，并在php中保持连接

Question

If we create a socket in server side then it runs in a infinite loop, cant we do something like this for the client side? Can we create a listening mood in a infinite loop? Do I need to create a new socket every for this every time?

Here is my code, it writes only once, when I try to write after socket_read it doesn't work.

Server side code

<?php
$host = "192.168.56.1";
$port = 8080;
$message = "Hello Client";
set_time_limit(0);
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
$result = socket_bind($socket, $host, $port) or die("Could not bind to socket\n");
$result = socket_listen($socket) or die("Could not set up socket listener\n");
echo 'listining ip '.$host." at port ".$port;
while(true){
$com = socket_accept($socket) or die("Could not accept incoming connection\n");
$input = socket_read($com, 1024) or die("Could not read input\n");
$input = trim($input);
echo '
Client says: '.$input;
socket_write($com, $message , strlen ($message)) or die("Could not write output\n");
}
echo '
server closed';
socket_close($com);
socket_close($socket);
?>

client side code

<?php
$host    = "192.168.56.1";
$port    = 8080;
$message = "Hello Server side";
$socket = socket_create(AF_INET, SOCK_STREAM, 0) or die("Could not create socket\n");
$result = socket_connect($socket, $host, $port) or die ("Could not connect to server\n");

socket_write($socket, $message, strlen($message)) or die("Could not send data to server\n");
$result = socket_read($socket, 1024) or die("Could not read server response\n");
socket_write($socket,$message, strlen($message)) or die("Could not send data to server\n");

echo "Server  says :";//.$result;
socket_close($socket);
?>

Answer 1

If we create a socket in server side then it runs in a infinite loop, cant we do something like this for the client side? Can we create a listening mood in a infinite loop?

Of course - if your server and client would send and receive strictly in turn, you could simply change the socket_read line in the client to

while ($result = socket_read($socket, 1024))

Do I need to create a new socket every for this every time?

No, you must not, since it wouldn't be the same connection.

But for a more complete server example which handles multiple connections and disconnections, cf. this answer to How to write server for chat program in php by using socket .