Description:
------------
Even when safe mode is enabled, and open_basedir restrictions is in place, it is possible to use file_exists(), stat() (and fileperms()) on any file on the system.


Reproduce code:
---------------
$filename = "/etc/shadow";
if (file_exists($filename))
{
  echo "$filename exists\n";
}
else
{
  echo "$filename does not exist\n";
}

$stat = stat($filename);