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  fsockopen can't handle unix sockets created in abstract namespace (unix sockets with the associated pathname starting with '\0'; see UNIX(4) of the 'Linux Programmer's Manual' for details).
  This bug is 'caused since the implementation of fsockopen in PHP 4.0.6 uses strlcpy to copy from $hostname to unix_addr.sun_path without looking at the first byte of $hostname (fsock.c, line 240). One possible solution would be to change line 240 from
  strlcpy(unix_addr.sun_path, (*args[0])->value.str.val,
  sizeof(unix_addr.sun_path));
  to
  pathofs = ((*args[0])->value.str.val[0] ? 0 : 1);
  strlcpy(unix_addr.sun_path + pathofs,
  (*args[0])->value.str.val + pathofs,
  sizeof(unix_addr.sun_path) - pathofs);
  where pathofs would be of type "size_t".
  Another solution avoiding the ugly '\0' byte would be to introduce separate scheme prefixes like "file:" and "abstract:" for UNIX domain sockets.
  Ciao,
  Mathias
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  My man page for unix sockets says this:.
  I'll integrate something that can handle this into the new
  streams architecture; you might not be able to do this in
  the PHP 4.2, but the release after will have it.
  Do you know if this is linux-only or do other platforms
  support it?
  Great, that you are going to integrate something like that. Yes, unfortunatly this feature appears to be linux-only :-/ ('ve read man pages and wrote test code on SunOS 5.8, IRIX 3, FreeBSD 4.3 and MacOS X 10.1).
  Nevertheless it's a cool feature since Linux removes abdoned Unix sockets of the abstract namespace automatically -- you don't have to take care about removing Unix sockets, don't need clever code to figure out weither a unix socket file belongs to a vital daemon or just is left over...
  The new streams architecture now supports this; you can
  try it out using a recent snap of CVS.
  It won't be in PHP 4.2, but if you are happy making the
  change you describe below to your local source, you
  should be sorted.
  I'm closing this; if you manage to test CVS and find it has
  a problem, re-open this report.