php (socket) can't write data without break or exit

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;

}

```

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) soket_write is not working i can't send data to server. if i put exit data send to server successfully and socket is closed. What can i do for this type of issue.

I don't know what mistake i done.?

I cant share my java server code. i create php server and client.
Here i attach the files.

Server - https://pastebin.com/embed_iframe/L30uKQAr
Client - https://pastebin.com/embed_iframe/Wfjzcebb