No.
It's just a fragment of trash in mainfile.php
(Use code block)
I mean this.
You can find the code in mainfile.php of XOOPS 2.0.16
foreach ( array('GLOBALS', '_SESSION', 'HTTP_SESSION_VARS', '_GET', 'HTTP_GET_VARS', '_POST', 'HTTP_POST_VARS', '_COOKIE', 'HTTP_COOKIE_VARS', '_REQUEST', '_SERVER', 'HTTP_SERVER_VARS', '_ENV', 'HTTP_ENV_VARS', '_FILES', 'HTTP_POST_FILES', 'xoopsDB', 'xoopsUser', 'xoopsUserId', 'xoopsUserGroups', 'xoopsUserIsAdmin', 'xoopsConfig', 'xoopsOption', 'xoopsModule', 'xoopsModuleConfig', 'xoopsRequestUri') as $bad_global ) {
if ( isset( $_REQUEST[$bad_global] ) ) {
header( 'Location: '.XOOPS_URL.'/' );
exit();
}
}