private static function get_random_bytes($count)
{
$output = '';
if (is_readable('/dev/urandom') && ($fh = @fopen('/dev/urandom', 'rb'))) {
$output = fread($fh, $count);
fclose($fh);
}
if (strlen($output) < $count) {
$output = '';
for ($i = 0; $i < $count; $i += 16) {
self::$random_state = md5(microtime() . self::$random_state);
$output .= pack('H*', md5(self::$random_state));
}
$output = substr($output, 0, $count);
}
return $output;
}
