client.php

 <?php
 error_reporting(E_ALL);
 send_message('127.0.0.1','8000', getmypid() . ' Message to send...');

 function send_message($ipServer,$portServer,$message)
 {
   $fp = stream_socket_client("tcp://$ipServer:$portServer", $errno, $errstr);
   stream_set_blocking($fp, false);
   if (1) {
     while(1) {
       $wr = array($fp);
       $rr = array($fp);
       $nl = null;

      if ($ss = stream_select($nl, $wr, $nl, 1, 0) > 0) {
          echo 'SS result=';
          var_dump($ss);
          $written = fwrite($fp, "$message" . time() . "\n");
          echo 'Written result:';
          var_dump($written);
          if ($written === false) {
              echo "FAILED TO WRITE";
              sleep(1);
          }
          if ($written === 0) {
             $info = stream_get_meta_data($fp);
             print_r($info);
              if (feof($fp)) {

                  echo 'FEOF detected';
              }

             sleep(1);

          }
          echo 'Written=' . $written . "\n";
          sleep(1);
      } else {
          echo 'cant select to write';
      }
     }

   }
 }          

server.php

 <?php

 $socket = stream_socket_server("tcp://127.0.0.1:8000", $errno, $errstr);

 echo "Dispatching...\n";
 pcntl_signal_dispatch();

 register_shutdown_function(function($s) {
    echo 'Doing shutdown';
    @fclose($s);
 }, $socket);

   while(1) {
     $conn = @stream_socket_accept($socket, 10);
     if ($conn) {
         while($data = fread($conn, 1024)) {
             if ($data) {
                 echo "RCV: " . $data;
             }
         }
         @fclose($conn);
     } else {
         break;

     }
   }


 @fclose($socket);

http://php.net/manual/en/function.fwrite.php

function fwrite_stream($fp, $string) {
    for ($written = 0; $written < strlen($string); $written += $fwrite) {
        $fwrite = fwrite($fp, substr($string, $written));
        if ($fwrite === false) {
            return $written;
        }
    }
    return $written;
}

Example seems to create** infinite LOOP** because FALSE is never returned, this is also mentioned in comments