php (client socket) java (server socket) cant receive second data

Question

This Is my code to connect java socket :-

$socket         = socket_create(AF_INET, SOCK_STREAM, SOL_TCP);
socket_connect($socket, '127.0.0.1', 12345);

while(true) 
{
    // read a line from the socket
    $line = socket_read($socket, 1024, PHP_NORMAL_READ);

    var_dump($line);

    $someArray  = json_decode($line, true);
    $otp         = $someArray["otp"];

    if($someArray["msg"] == "otp_generation")
    {           
        $myObj      = new \stdClass();          
        $myObj->msg = "OTP RECEIVED NEED TO CONNECT";       
        $send       = json_encode($myObj);

        socket_send($socket, $send, strlen($send), 0);
    }
    exit;       

}

My Question is -

When connection is established successfully server send one OTP to client and received successfully in client. Then i send data to server OTP RECEIVED acknowledgement, it also received in server. After OTP RECEIVED acknowledgement server send welcome msg to client. I cant get the welcome message. if i remove the "exit" code browser is still loading, finally crashing. Why i didn't receive the second data. anyone solve my issue. what i need to modify. am beginner for socket.

I need to display Welcome msg. What can i do?

When you remove exit you have an infinite loop since it doesn't check for a condition to break out. — Barmar
– Barmar, Commented Apr 3, 2020 at 21:19
Does the server close the connection after sending the welcome message? $line will be FALSE when the server closes the connection, you should check for that. — Barmar
– Barmar, Commented Apr 3, 2020 at 21:20
@Barmar server didn't close the connection. It will close after 3 minutes. — Bala Murugan
– Bala Murugan, Commented Apr 4, 2020 at 4:51
@Barmar if i remove the exit, it will infinite but i cant trace any data from server. If i put exist 1st response will show. Could u tell what can i do. Any examples you have — Bala Murugan
– Bala Murugan, Commented Apr 4, 2020 at 4:52

Barmar · Accepted Answer · 2020-04-04 19:34:30Z

1

You need to continue looping and read the next message, then break out of the loop.

while(true) 
{
    // read a line from the socket
    $line = socket_read($socket, 1024, PHP_NORMAL_READ);

    var_dump($line);

    $someArray  = json_decode($line, true);

    if($someArray["msg"] == "otp_generation")
    {           
        $otp         = $someArray["otp"];
        $myObj      = new \stdClass();          
        $myObj->msg = "OTP RECEIVED NEED TO CONNECT";       
        $send       = json_encode($myObj);

        socket_send($socket, $send, strlen($send), 0);
    } elseif ($someArray["msg"] == "welcome") {
        // do whatever you need to do with the rest of the message
        break; // then get out of the loop
    } else {
        echo "Unknown message received";
        var_dump($someArray);
        break;
    }
}

I had to make a guess about how the welcome message is formatted, but this should give you the general idea.

edited Apr 4, 2020 at 19:34

answered Apr 4, 2020 at 5:59

Barmar

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15 Comments

Bala Murugan Over a year ago

Thanks for your reply. Browser is still loading, output is not displayed. could u suggest any other option there for tcp simultaneous connection.

Barmar Over a year ago

Are you sure the server is sending a second message? It sounds like the second call to socket_read() is waiting for the message.

Bala Murugan Over a year ago

yes i develop the server also. it send the second message. Could you find the solution Please.

Bala Murugan Over a year ago

If i put exit "OTP RECEIVED NEED TO CONNECT" message is send to server otherwise is not send.

Barmar Over a year ago

I've added an else clause to handle an erroneous message

|

Bala Murugan · Accepted Answer · 2020-04-08 13:04:29Z

0

Without new line cmd data is not send. This is the mistake i done. Finally i got the answer from my friend.

I just add the line below;-

socket_send($socket, $send."\r\n", strlen($send."\r\n"), 0);

Thanks @hemanth kumar and @Barmar

answered Apr 8, 2020 at 13:04

Bala Murugan

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