(PECL apc >= 3.1.4)
apc_bin_dump — Get a binary dump of the given files and user variables
$files = NULL
   [, array $user_vars = NULL
  ]] )
   Returns a binary dump of the given files and user variables from the APC cache.
   A NULL for files or user_vars signals a dump of every entry, whereas array() will dump
   nothing.
  
   Returns a binary dump of the given files and user variables from the APC cache,
   FALSE if APC is not enabled, or NULL if an unknown error is encountered.