CODEWITHSUNDEEP
phpsocketsxampp
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Reputation: 923

Keeping PHP Server socket alive after connection

I have a Server socket page that basically receives a string, reverses it and sends it back to the client, that works perfect, the socket however closes after the connection, tried fixing this but to no avail, can anyone please tell me what I'm doing wrong?

    $host = "192.168.8.121";
    $port = 232;

    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, 3) or die("Could not set up socket listener\n");

    $spawn = socket_accept($socket) or die("Could not accept incoming connection\n");

    $input = socket_read($spawn, 1024) or die("Could not read input\n");


    $input = trim($input);
    echo "Client Message : ".$input;

    // reverse client input and send back
    $output = strrev($input) . "\n";
    socket_write($spawn, $output, strlen ($output)) or die("Could not write output\n");

    // close sockets
    socket_close($spawn);
    socket_close($socket);

Upvotes: 3

Views: 2080

Answers (1)

Agnius Vasiliauskas
Agnius Vasiliauskas

Reputation: 11277

You need a socket read loop:

function error($socket) {
    return socket_strerror(socket_last_error($socket));
}

$host = "127.0.0.1";
$port = 1024;

set_time_limit(0);

$socket = socket_create(AF_INET, SOCK_STREAM, 0) or
          die(__LINE__ . ' => ' . error($socket));

$result = socket_bind($socket, $host, $port) or
          die(__LINE__ . ' => ' . error($socket));

$result = socket_listen($socket, 3) or
          die(__LINE__ . ' => ' . error($socket));

$spawn = socket_accept($socket) or
         die(__LINE__ . ' => ' . error($socket));

while(true) {

    $input = socket_read($spawn, 1024) or
             die(__LINE__ . ' => ' . error($socket));

    $input = trim($input);

    if ($input == 'exit') {
        echo 'exiting from server socket read loop';
        break;
    }

    echo "Client Message : " . $input . '<br>';

    // reverse client input and send back
    $output = strrev($input) . "\n";
    socket_write($spawn, $output, strlen($output)) or
    die(__LINE__ . ' => ' . error($socket));

}

// close sockets
socket_close($spawn);
socket_close($socket);

Upvotes: 1

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