I have now tested this using PHP 5.0.4 (cli), and the bug remains.  This bug was fixed by wez@php.net on Sep 2003, but has now crept back in to both versions 4 and 5 of PHP.

PHP is failing to clear the EOF indicator when reading a stream that would otherwise BLOCK if read.

--- quote (wez@php.net):
The PHP streams implementation uses the following logic
for determining the EOF status:

- after a read attempt, if no bytes were read OR
  (a read error occurred and the error != EWOULDBLOCK)
  --> set the EOF indicator
  otherwise, clear the EOF indicator [1]

- after a successful fseek(), clear the EOF indicator.

[1] - this step was missing and has just been comitted to
the CVS.

The feof() function call works like this:
- if stream buffer has data, return false
- otherwise, return the EOF indicator flag.

---endquote

Assigning to Wez since he fixed it last time..

Bug is still present in latest snapshot of PHP.

Also... there seems to be at least one other bug report that is related to this problem.  See bug #32979.  The problem is
directly related (and caused) by faulty stream_select and stream_get_meta_data behaviour.

In summary:
1)  stream_select does not properly detect the presence of additional input data after it hits an EOF.  Neither does stream_get_meta_data.  They both continue to return EOF even for a stream that has new data (filestream, in my example).
2)  stream_select does not properly honor its timeout parameter.  If no data is available, the call should WAIT for the timeout period to expire before returning due to an EOF condition.  Instead, it always returns immediately with an EOF, making the timeout parameter pointless.
3)  stream_select does not properly emulate the select() system call, which would wait for a timeout if no more data were available (EOF)... in case more data did become available.

Please let me know how else I can help.  I'd like to get this recurring problem resolved once and for all.

Please try using this CVS snapshot:

  http://snaps.php.net/php5-latest.tar.gz
 
For Windows:
 
  http://snaps.php.net/win32/php5-win32-latest.zip

No feedback was provided for this bug for over a week, so it is
being suspended automatically. If you are able to provide the
information that was originally requested, please do so and change
the status of the bug back to "Open".

Tested on Fedora4
Linux XXXX 2.6.11-1.1369_FC4smp #1 SMP Thu Jun 2 23:08:39 EDT 2005 i686 i686 i386 GNU/Linux

php 5.2.5 compiled without SSL (--openssl)

Reproduce code:

#!/usr/local/bin/php
<?php
$file = "/tmp/maillog";
$fp = @fopen($file, 'r');
if (!$fp)
 die ("Could not open $file");

while (true) {
   $r = array($fp);
   $n = stream_select($r, $w = null, $e = null, 30);
   if ($n) {
      echo fgets($fp);
   }
}

Still an issue in php5.2.x.

Stephen