Question

I am trying to print a UDP message in a while loop which runs 10 times in PHP. the problem is that it waits until the loop completes and then the message is printed 10 times but I want to print it on each iteration of the loop not at the completion of the loop. Here is my code.

<?php
  $socket = socket_create(AF_INET,SOCK_DGRAM,SOL_UDP);
  socket_bind($socket,$ip_address,$port);

  $i = 0;
  while($i < 10)
  {
    $i++;
    $FROM = '';
    $PORT = 0;

    socket_recvfrom($socket,$buffer,1024,0,$from,$PORT);
    echo "Receiving $buffer from IP $FROM and Port $PORT", PHP_EOL);
    flush();
    sleep(1);
   }
?>

Answer 1

Call ob_flush() to flush the output buffer, after your call to flush().

This function will send the contents of the output buffer (if any)

If accessing from a browser, header( 'Content-type: text/html; charset=utf-8' ); might need to be added at the top of your webpage

Also an ob_start() at the beginning of the script turns on output buffering.