Retest with "killer" params  

Raw display of $_GET:

$_REQUEST ($_GET, $_POST and $_COOKIE):
array (
)
$_SERVER:
array (
  'PATH' => '/sbin:/usr/sbin:/bin:/usr/bin',
  'PP_CUSTOM_PHP_INI' => '/var/www/vhosts/system/rhaworth.com/etc/php.ini',
  'PP_CUSTOM_PHP_CGI_INDEX' => 'fastcgi',
  'FCGI_ROLE' => 'RESPONDER',
  'UNIQUE_ID' => 'XBkwSgVNI4QAABpRdIsAAAAa',
  'HTTP_USER_AGENT' => 'CCBot/2.0 (https://commoncrawl.org/faq/)',
  'HTTP_ACCEPT' => 'text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8',
  'HTTP_IF_MODIFIED_SINCE' => 'Tue, 23 Oct 2018 14:19:08 GMT',
  'HTTP_HOST' => 'rhaworth.com',
  'HTTP_CONNECTION' => 'close',
  'HTTP_ACCEPT_ENCODING' => 'gzip',
  'SERVER_SIGNATURE' => '',
  'SERVER_SOFTWARE' => 'Apache',
  'SERVER_NAME' => 'rhaworth.com',
  'SERVER_ADDR' => '5.77.35.132',
  'SERVER_PORT' => '80',
  'REMOTE_ADDR' => '52.6.70.202',
  'DOCUMENT_ROOT' => '/var/www/vhosts/rhaworth.net/rh_com',
  'SERVER_ADMIN' => 'rwhaworth@gmail.com',
  'SCRIPT_FILENAME' => '/var/www/vhosts/rhaworth.net/rh_com/test/showenv.php',
  'REMOTE_PORT' => '33170',
  'GATEWAY_INTERFACE' => 'CGI/1.1',
  'SERVER_PROTOCOL' => 'HTTP/1.1',
  'REQUEST_METHOD' => 'GET',
  'QUERY_STRING' => '',
  'REQUEST_URI' => '/test/showenv.php',
  'SCRIPT_NAME' => '/test/showenv.php',
  'PHP_SELF' => '/test/showenv.php',
  'REQUEST_TIME' => 1545154634,
)
$_SESSION:
NULL
$_ENV:
array (
)
$_FILES:
array (
)
$argc =   
 
$argv:
NULL
$_GET:
array (
)
$_POST:
array (
)
$_COOKIE:
array (
)
getcwd() (matches $_SERVER['SCRIPT_FILENAME']): '/var/www/vhosts/rhaworth.net/rh_com/test'
 
getdate():
Array
(
    [seconds] => 14
    [minutes] => 37
    [hours] => 17
    [mday] => 18
    [wday] => 2
    [mon] => 12
    [year] => 2018
    [yday] => 351
    [weekday] => Tuesday
    [month] => December
    [0] => 1545154634
)
phpversion():  5.3.3 
ShowEnv   RWH   2015 Aug 28  16:50   |   php file date:  2015 Aug 28  16:54:48
All sites: localhost | RHaworth.net | WMflabs | southlondonquakers.org.uk | RHaworth.com (interceptor) | toolserver
RHaworth.110mb.com (moribund) | CroyDFAS (dead)