Reading data from fsockopen using fgets/fread hangs

feof, fgets, fread, fsockopen, php

Solution

Your script is hanging in the while loop at the end. This is because you have used `!feof()` as the condition for the loop, and the server is not closing the connection. This means the `feof()` will always return `false` and the loop will continue forever.

This will not be problem when your write a full implementation, as you will be looking for response codes and can break out of the loop accordingly, for example:

<?php

  // Open a socket
  if (!($fp = fsockopen('ssl://imap.gmail.com', 993, $errno, $errstr, 15))) {
      die("Could not connect to host");
  }

  // Set timout to 1 second
  if (!stream_set_timeout($fp, 1)) die("Could not set timeout");

  // Fetch first line of response and echo it
  echo fgets($fp);

  // Send data to server
  echo "Writing data...";
  fwrite($fp, "C01 CAPABILITY\r\n");
  echo " Done\r\n";

  // Keep fetching lines until response code is correct
  while ($line = fgets($fp)) {
    echo $line;
    $line = preg_split('/\s+/', $line, 0, PREG_SPLIT_NO_EMPTY);
    $code = $line[0];
    if (strtoupper($code) == 'C01') {
      break;
    }
  }

  echo "I've finished!";

Problem

Here is the code that I am using: ``` if (!($fp = fsockopen('ssl://imap.gmail.com', '993', $errno, $errstr, 15))) echo "Could not connect to host"; $server_response = fread($fp, 256); echo $server_response; fwrite($fp, "C01 CAPABILITY"."\r\n"); while (!feof($fp)) { echo fgets($fp, 256); } ``` I get the first response: ``` OK Gimap ready for requests from xx.xx.xx.xx v3if9968808ibd.15 ``` but then the page times out. I have searched through stream_set_blocking, stream_set_timeout, stream_select, fread, etc. but could not get it to work. I need to read all the data that the server sends and then proceed with other commands (I would be retrieving emails using imap). Thanks

Original source