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I have a domain ( I want to PHP socket to communicate with clients. However, After I run program, it has error:

****Warning: socket_bind(): unable to bind address [22]: Invalid argument in /home/vietchip/public_html/ on line 27 socket_bind() failed: reason: Invalid argument socket_bind() failed: reason: Invalid argument****





/* Allow the script to hang around waiting for connections. */

/* Turn on implicit output flushing so we see what we're getting
* as it comes in. */

$address = "";
$port = 10000;

// Create Socket
$sock = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
if ($sock === false) {
echo "socket_create() failed: reason: " . socket_strerror(socket_last_error()) . "\n";
if (!socket_set_option($sock, SOL_SOCKET, SO_REUSEADDR, 1)) {
echo socket_strerror(socket_last_error($sock));

// Bind socket to port
socket_bind($sock, $address, $port);
if (socket_bind($sock, $address, $port) === false) {
echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";

// Start listening for connection
socket_listen($sock, 5); // Maximum is 5 connection
if (socket_listen($sock, 5) === false) {
echo "socket_listen() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";

// Handling connection from client
do {
$msgsock = socket_accept($sock); // msgsock is a client connect to webserver
if ($msgsock === false) {
echo "socket_accept() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";

$request ="PHP said : you are sent " . socket_read($msgsock, 2048, PHP_BINARY_READ);
socket_write($msgsock, $request, strlen($request));
socket_close($msgsock); // Close connect of client
} while (true);
socket_close($sock); // Close socket of server

Please help me fix this error. Thanks so much.

What I have tried:

I have tried a lot of method about 1 month, but it doesn't work
Updated 20-Mar-17 21:58pm

1 solution

You are calling socket_bind twice:
// Bind socket to port
socket_bind($sock, $address, $port);
if (socket_bind($sock, $address, $port) === false) {
    echo "socket_bind() failed: reason: " . socket_strerror(socket_last_error($sock)) . "\n";

The first call succeeds and the second fails because you can't bind to an IP address and port that is already in use. Remove the first call. Same for socket_listen below.
Member 13072690 21-Mar-17 6:06am
Thanks for your response. This error is true, however after i corrected, this is error:
Gateway Timeout
The gateway did not receive a timely response from the upstream server or application.

Code Java of client:


public class WebClient {
public static void main(String[] args) throws IOException {

String host ="";

Socket s = null;
BufferedReader br = null;
BufferedWriter bw = null;
try {
s = new Socket(host, 10000);
br = new BufferedReader(new InputStreamReader(s.getInputStream()));
bw = new BufferedWriter(new OutputStreamWriter(s.getOutputStream()));
} catch (UnknownHostException e) {
System.err.println("Don't know about host: hostname\n");
} catch (IOException e) {
System.err.println("Couldn't get I/O for the connection to: hostname\n");
// Send message to server
String message = "FETEL HCMUS";
// String message = "GET / HTTP/1.1\r\n\r\n";
// System.out.println(message);
// Get response from server
String response = "";
while ((response = br.readLine()) != null) {

Please help me more
Jochen Arndt 21-Mar-17 6:22am
Where does that error occur? On the client?

Then it seems to be a problem with the client code and you should raise a new question because it is not realy related to this question and there will be more people seeing the new question and might help.
Member 13072690 21-Mar-17 22:05pm
Ok, I will make a new question

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